AT&T StarLAN 10 Instruction Manual

555-520-200Issue 1, June 1987AT&T System 25Reference Manual

Call Handling CapabilitiesSystem 25 can be arranged as a stand-alone system or can be part of a private network. Thesystem provides 256 ports to sup

Interactions (Standard Group Coverage)●Attendant Console, Direct Trunk: If the Direct Trunk attendant is a receiver fora Call Coverage Group and exte

Interactions (DGC Group Coverage; V2 Only)●●●●●●●●●●Attendant Console, Switched Loop: If a SLAC is a member of a DGC-CallCoverage Receiver Group, an

. Number of rings before call coverage ringing starts on no answer (0-31); Default = 2.The status LEDs on Group Coverage buttons at covering stations

CALL COVERAGE—INDIVIDUALDescriptionThis feature is very similar to Call Coverage–Group.The primary difference is that this isa one-on-one type coverag

Interactions●Attendant Console, Direct Trunk: When a coverage call rings at a busyAttendant Console, the attendant receives a single burst of ringing

CALL FOLLOWING (FORWARDING)DescriptionAllows users who are away from their phone to receive calls at another phone. The featureis functionally equival

Interactions● Call Coverage: Calls to a logged-in FPDC receive the call coverage of thatterminal. [Unanswered calls to a PDC at an away terminal retur

CALL PARKDescriptionAllows a user to place a call on hold and then pick up the call from any voice terminal in thesystem. It is used in three typical

A call parked with the Selector Console is retrieved by dialing *8 and the access codeassigned to the dedicated Selector Console Call Park button.Each

Administration RequirementsAttendant Selector Console:● Assign Call Park buttons.Hardware RequirementsNone2-88

Incoming Business CommunicationsSuccessful call termination is the key to capturing all incoming communications associatedwith revenue issues, client

CALL PICKUPDescriptionAllows a user to answer a call ringing at another voice terminal. There are two forms ofCall Pickup; (l) Directed and (2) Group.

● Personal Line: After a call is picked up from a Personal Line (PERS LINE) button,the called terminal can still enter the call.Administration Requir

CALL PROGRESS TONESCall Progress tones provide audible feedback on the status of calls during call set-up.● Busy Tone:A slow pulsed tone indicating th

CALLING RESTRICTIONSDescriptionDesignated voice and data terminals can be restricted from making certain types of calls.Available restrictions are:● O

ARS Restriction:Special restrictions on each station may be imposed when the call is routed by the ARSfeature. Facility Restriction Levels (FRLs) are

Automatic Route Selection:● Route Facility Restriction LevelsTrunk Port:● Allow dial access to this trunk (Yes, No) - Default = YesSystem (V2 only):●

COMMAND MODEAllows data terminal users to originate data and voice calls and change (or view) their dataport options.(Refer also to the general descri

<Options>:If the Command Mode menu item <Options> is chosen, the terminal displays the data port’sadministered options.System default valu

TABLE 2-F. Partial List of Permissible Data Port (TN726) OptionsOPTIONDEFINITIONSpeed (61-68)†Autobaud, Low *, 300, 1200, 2400, 4800, 9600, 19200Parit

TABLE 2-G. Typical Option Profiles for Different Types of Data Port EndpointsOptionsSpeed (highest)ParityEnable Command ModePermit MismatchLocal EchoA

supported by secretarial service and equipped with economical single-line phones.When alternate resources are not available to handle an incoming call

COMMUNICATIONS ACCESS MANAGER (CAM) (V2)The CAM program facilitates communication between workstations on the AT&T STARLANNETWORK (STARLAN NETWORK

The STARLAN NETWORK communication driver (NAUCOM) is used before CAM is run ona STARLAN NETWORK workstation. The Extended Device driver (CAM232) is us

CONFERENCEDescriptionAllows up to five parties, including the conference originator, to participate in a conferencecall. Any voice terminal user, incl

●Call Park: Call park may be used to place a conference on hold. Parked conferencecalls do not return to the parking station (they remain parked).If

CONFERENCE DROPDescriptionAllows a voice terminal user, except for the attendant at a Switched Loop Attendant Console(SLAC, V2 only), to selectively d

InteractionsNoneAdministration RequirementsNoneHardware RequirementsNone2-104

DATA CALL SETUPAllows a user to originate data calls from a data terminal. System 25 provides three methodsof data calling:● Dialing from a data term

DATA SERVICES OVERVIEWSystem 25’s data features provide switched data transmission at up to 19,200 bps (RS-232interface ), and a 212A modern compatibl

and AB (Signal Ground) to function,while others require more RS-232 controlsignals to operate.An ADU (Figure 2-19) can send Data Terminal Ready (DTR)f

Data Terminal Dialing mode,or to enter the Setup mode on callsoriginating from a voice terminal or on auto-answered calls.In the case of most personal

Ease of access to multiple types of network facilities (provided for minimum cost) ismanaged by:● Automatic Route Selection (ARS) allows the customer

Data Endpoint StatesThe data endpoint may take on three states: (l) off-line, (.2) on-line (on-hook), and (3) on-line(off-hook). Off-line is when a da

Setup mode is entered.f. Data Call Setup ModeData Call Setup Mode is a transitional state entered after Transfer To Data, DataTerminal Dialing, or dur

●Flashing–Data endpoint is being alerted of an incoming call● On Steady–Data endpoint is either in the on-line (off-hook) state or isreserved for anot

DATA TERMINAL DIALINGDescriptionWhen the user makes a data call from a data terminal, voice terminal dialing and callprogress tones are replaced by ke

End-to-End Signaling:Data connections to off-premises destinations require that a conversion resource (pooledmodem) be inserted into the connection. O

TABLE 2-H. Call Progress Messages for Data Terminal DialingDisplayedMessageApplication MeaningDIAL:Placing a callEquivalent to dial tone. Enter anyreq

ConsiderationsData Terminal Dialing allows users to place data calls from their terminals using the DataTerminal Dialing feature and allows users to r

DIAL PLANThe dialing plan for System 25 is based on the concept that, whenever possible, calls shouldbe placed to individualsrather than to voice term

● #5–Insert dialed digits here (in Virtual Facility numbers; (V2 only)● #–End of dialingThe maximum number of dial codes available for a System 25

DICTATION SYSTEM ACCESSDescriptionPermits access to, and control of customer-owned dictation equipment by voice terminalusers.Dictation systems may be

●Automatic Intercom allows multiline voice terminal users to call each other by use ofa dedicated line appearance. A private dedicated path ensures th

SYSTEM 25———CABINETPART OFOCTOPUSPART OFCABLESIPTN742———C2W1C5DICTATIONORSIPlB1ADAPT .EQUIPMENTZTN78———(NOTE)LEGEND:TN742 - ANALOG LINE CPZTN78 - TIP

DIGITAL TAPE UNIT (DTU)The Digital Tape Unit (Figure 2-21 ) is a RS-232 device used to record administrationtranslations.The DTU does not encode the t

SYSTEM 25 PART OFCABINETOCTOPUSCABLEPART OF———ZTN82SIP———OR ZTN128C2Z210AC1●355A/AFCALLADAPT.PROCESSOR——————LEGEND:C1 - MODULAR CORD (D8W-87) - PEC 27

DIRECT GROUP CALLING (DGC)DescriptionAllOwS incoming calls to be directed to a specific group of terminals. Up to 32 DGC groups,each including up to

ConsiderationsDGC groups are particularly useful when the answering group receives a high volume ofcalls. Call completion time is minimized and attend

● Transfer: For V2 systems only: internal stations can transfer outside (trunk) callsto a busy DGC group.The transferred call will be treated as any

DIRECT GROUP CALLING DELAY ANNOUNCEMENTDescriptionProvides a recorded announcement to an outside (trunk) caller who has been placed in queuefor a DG

SYSTEM 25CABINETPART OFOCTOPUSPART OFCABLESIPTN742———C2SIPW1C5DELAYOR●ADAPT .B1 ANNOUNCEMENTZTN78———EQUIPMENT———LEGEND:TN742 - ANALOG LINE CPZTN78 - T

DescriptionAllows incoming calls to reach specific individuals or facilities in the system withoutattendant assistance.System 25 customers reserve blo

sender will flash and will then go dark when the call is answered. However, if thecall is placed directly to the attendant position or is forwarded to

● Circuit switched data communications up to 19,200 bps (RS232 interface). Thisprovides circuit switched connections from asynchronous data terminals

Hardware Requirements:Each DID trunk requires a port on a TN753 DID Trunks CP.2-129

DIRECT STATION SELECTION (DSS)DescriptionAllows one-button access to another voice terminal, a paging zone, or a DGC Group. Thisfeature requires a but

● Line Selection (Prime Line Preference): When Prime Line Preference isassigned to a DSS button, the button must be pressed to invoke the busy-to-idl

DISTINCTIVE RINGINGDescriptionAllows users to distinguish between different types of incoming calls.Users can receive the following types of ringing:●

END-TO-END SIGNALINGDescriptionAllows multiline voice terminals to send touch-tone (DTMF) signals over the DDD networkand allows single-line and multi

EXCLUSIONDescriptionAllows multiline voice terminal users to keep other users with appearances of the samePersonal Line from listening in on their cal

EXPERT MODE (V2)DescriptionExpert Mode is an enhancement to the Command Mode feature that provides an alternativemethod of performing the full range o

If the user enters “D” and then a RETURN, the system will prompt for the data endpointnumber as follows:Command: DDIAL:The user must then enter the d

Command: PEChange Parity to EvenCommand: MYChange Mismatch to YesIf the user enters an invalid Option or setting, the system responds with INVALIDOPT

EXTENDED STATIONSDescriptionAllows single-line voice terminals to be located at distances greater than 2000 feet from thesystem cabinets.Extended stat

●Terminal Dialing provides the user with fast access to data communications viakeyboard dialing at a terminal or PC.●Command Mode provides a menu of d

EXTERNAL ALERTSDescriptionProvides standard station ringing at a location away from the called station. This featurecan be used to activate an externa

Order the Supplemental Alert Adapter (PEC 2301-SAA) for controlling a remote alertingdevice. A Supplemental Alert Adapter is installed in the line bet

SYSTEM 25PART OFCABINETOCTOPUSCABLEPART OF———SIPZTN79———C2SIPW1C1ATL●ADAPT .B1LINE CP———TERMINALT1———LEGEND:A1 - SUPPLEMENTAL ALERT ADAPTER (2301-SAA)

HANDS-FREE ANSWER ON INTERCOM (HFAI)DescriptionAllows the following voice terminals to provide hands-free answer service on eligibleincoming calls; ea

—During the call, the called party can press the HFAI/Mic or MICROPHONEbutton to mute the microphone temporarily and prevent the caller fromhearing. P

Interactions●Attendant (V1 Only): The attendant may pass calls to HFAI sets using theTransfer feature and button rather than extending these calls

HEADSET ADAPTER ADJUNCTDescriptionThe headset adapter adjunct provides an interface for connecting a headset to an associatedvoice terminal. A headset

● Figure 2-28 -Typical Headset Adapter Connections for 34-Button Deluxe, BIS, or BISwith Display Voice Terminals● Figure 2-29 -Typical Headset Adapter

SYSTEM 25CABINETZTN79HYBRIDLINE CPPART OFOCTOPUS CABLE———PART OF SIPC2SIPW1C1VOICE●ADAPTB1TERMINALT1,———C8——————502A HEADSETADAPTER -PEC 3164-HFALEGEN

SYSTEM 25CABINETPART OFZTN79HYBRIDOCTOPUS CABLE—— —PART OF SIPLINE CPC2SIPW1 B1C1VOICE●ADAPTTERMINALT1—— —I—— ——— —C7PWRSUPPLYP1C8502A HEADSETADAPTER

Figures 1 and 2.) Every circuit slot in the system can be used for trunk cards orvoice/data station cards. All these attributes allow the client to ad

SYSTEM 25CABINETTN735METLINE CPPART OFOCTOPUSCABLEPART OF SIP——————●●———C2SIPW1400B2C1MET SETB1ADAPTADAPTT1C7———LEGEND:———248B———ADAPT2012DTRANSB1- TY

HOLDDescriptionAllows users to temporarily disconnect from one call and either place or answer another call.A single-line voice terminal user can plac

INTERCEPT TREATMENT WITH REORDER TONESDescriptionReorder tone (fast busy) is provided when an unassigned or toll-restricted number is dialed,a dialing

INTERDIGIT TIMEOUTSDescriptionAllows an originating register to be made available for others if dialing is not completedwithin a set time period.Inter

LAST NUMBER DIALED (V2)DescriptionAutomatically saves the last number dialed from a multiline voice terminal and allows theuser to place the call agai

● Call Accountability: When a station user dials ##PDC to provide accountability fora call and then dials the desired digits, the ##PDC is not saved

LINE SELECTIONDescriptionMultiline voice terminals may have many line (facility) appearances. There are threemethods by which a user may select a desi

Preselection:Allows multiline voice terminal users to override the above line preference features.Users may simply press a desired line access button

LINE STATUS AND l-USE INDICATIONSDescriptionProvides users with a visual indication of the status of feature buttons and lines appearingat a their mul

Administration RequirementsNoneHardware RequirementsNone2-158

Types of trunks which can be assigned in System 25 are:● Central Office, which provide a link with the local telco for incoming and outgoingcalls (LS/

MANUAL SIGNALINGDescriptionAllows a user to signal another voice terminal.The user may do this at any time, whetheron-hook or off-hook.Multiline voice

MESSAGE CENTER-LIKE OPERATION (V2; SLAC Only)DescriptionA System 25 Switched Loop Attendant Console (SLAC) can be made to function like amessage cente

operator for the entire system.A call extended by either Attendant to a station thatdoes not answer or is busy returns to the Message Center.Two combi

MESSAGING SERVICESDescriptionLights an LED to indicate that another station (or the attendant) has a message for theuser.The Messaging Services provid

Station-To-Station Message Waiting:Multiline voice terminals can be assigned (paired) Message Waiting (MSG WAIT) buttonswith associated status LEDs. W

MODEM POOLINGDescriptionAllows switched data connections between digital data endpoints and analog data endpoints.(Refer also to the description of th

● On-Premises Data Calls: To establish a data connection between an on-premisesanalog data endpoint and an on-premises digital endpoint.● Outgoing T

Hardware RequirementsOne TN758 Pooled Modem CP provides two conversion resources. Two TN758s are allowedper system cabinet, for a total of 12 conversi

MUSIC-ON-HOLDDescriptionProvides rnusic or other audible indication to a held party on an outside line.On an outside call, if the user places the call

Hardware RequirementsA music source is needed to support the Music-On-Hold feature. The interface is a port on aZTN78 Tip Ring Line CP or TN742 Analog

USER CHANGEABLE OPTIONS (V2) . . . . . . . . . . . . .VIRTUAL FACILITIES (V2) . . . . . . . ● . . . . ● . . ● ●LIST OF FIGURESFigure 2-1.Direct Tr

SYSTEM 25CABINETPART OFOCTOPUS CABLETN742PART OF SIPORC2SIPW1MOHADAPT.UNITZTN78W1368 VOICEW1C6MUSICCOUPLERB1SOURCEW12012DTRANSFORMERLEGEND:TN742 - ANA

NIGHT SERVICEDescriptionAllows users to answer incoming calls on specified trunks when the attendant is not on duty.There are two types of Night Servi

Trunk-Answer-from-Any-Station:Allows any user to answer NS calls.Incoming trunk calls activate an external alertingdevice such as a bell (“External Al

● Assign Night Service Access Code.Hardware RequirementsTAAS NS requires an associated external alert (such as a bell). Each alert requires a porton a

NIGHT SERVICE DELAY ANNOUNCEMENTSDescriptionProvides a recorded announcement for incoming trunk calls when the system has DirectedNight Service (NS) a

SYSTEM 25CABINETPART OFOCTOPUSPART OFCABLESIPTN742———C2SIPW1C5DELAYOR●ADAPT.B1ANNOUNCEMENTZTN78EQUIPMENT——————LEGEND:TN742- ANALOG LINE CPZTN78 -TIP R

OFF-PREMISES STATIONS (OPS)DescriptionAn OPS is a single-line voice terminal that is located in another building and connected toSystem 25 via arrange

OUT-OF-BUILDING STATIONSDescriptionSingle-line voice terminals and multiline 7300H series terminals may be directly connectedto the system even though

PAGING SYSTEM ACCESSDescriptionProvides users with dial access or feature button access to paging equipment.As many as three paging zones can be provi

Interactions● Direct Inward Dialing: A DID call may access a paging code. This allows theuser to dial in and utilize the Paging System Access featur

© 1987 AT&TAll Rights ReservedPrinted in USATO ORDER COPIES OF THIS DOCUMENT REFER TO DOCUMENT NUMBER 555-520-200.Contact: Your AT&T sales rep

Figure 2-26.Figure 2-27.Figure 2-28.Figure 2-29.Figure 2-30.Figure 2-31.Figure 2-32.Figure 2-33.Figure 2-34.Figure 2-35.Figure 2-36.Figure 2-37.Figure

SYSTEM 25CABINETIPART OF TAE700A NETWORKINTERFACE BLOCK(110- OR 66-TYPE CONNECTING BLOCK)W1BZTN76W1†PAGINGORC5B1ZTN77SYSTEMLEGEND :ZTN76 - CO GROUND

SYSTEM 25CABINET25 PAIR DE CABLEPART OF66-BLOCKA❘❘❘❘❘❘❘❘❘❘W1278AW1PAGING ORTN763C5ADAPTERB1DICTATIONSYSTEMLEGEND :-VGROD-181321ZENER KITC648V DCP1GRD

PERSONAL DIAL CODE (PDC)DescriptionEach station is assigned a PDC. The user may log in the PDC at any other voice terminal,and calls to the PDC will f

A call unanswered at the away terminal will be directed back to the home terminal unlessone of the following busy conditions exists at the home termin

Interactions● Call Coverage:Calls to a logged-in FPDC receive the call coverage of thatterminal. lJnanswered calls to a PDC at an away terminal return

PERSONAL LINESDescriptionProvides a dedicated outside line for multiline voice terminal users.Unlike pooled facilities, which can be accessed via dial

● Line Selection (Prime Line Preference):Prime Line Preference may beassigned to a Personal Line.● Pooled Facility: A Personal Line may also be a mem

POOLED FACILITY - DIAL ACCESSDescriptionAllows both multiline and single-line voice terminal users to access a common pool of trunksby dialing a facil

POOLED FACILITY - DIRECT ACCESSDescriptionAllows multiline voice terminal users to access a common pool of trunks via a Direct FacilityAccess (FACILIT

Administration RequirementsVoice Terminal (Station Port):●Assign Direct Facility Access (FACILITY) buttons.Trunks:● Assign Facility Access Codes.Hardw

TABLE 2-A. System Features . . . . . . . . . . . . . . . . . . .TABLE 2-B. Network Features . . . . . . . . . . . . . . . . . .TABLE 2-C. Data Feature

POWER FAILURE TRANSFER (PFT)DescriptionProvides service to and from the CO for a limited number of prearranged single-line voiceterminals during a c

trunks. If Ground Start trunks are used, a 55A1 Ground Start Button must be provided ateach PFT set.Only FCC registered single-line voice terminals ma

(TRUNK)AT&T10B EMERGENCYTRANSFER UNITSWITCHADDITIONAL(CPU)ETUFOR PROPER OPERATIONTHIS UNIT MUST BEGROUNDEDFigure 2-35. 10B Emergency Transfer Unit

SYSTEM 25CABINETTRUNK25-PAIRTAECENTRAL—————————PORTOFFICECALL-48VPROCESSORTOADDITIONALETUsETUETU TO SWITCHETU TO(TRUNK)CO❑CPUADDITIONAL❑ETUETU TO SWIT

700A NETWORKINTERFACE BLOCKDIGITAL SWITCH (66-, OR 11O-TYPE)COTRUNK CPCOTRUNK CPCONETWORKACCESSCO TRUNKSRJ2x1TRUNK CPCOTRUNK CPCOTRUNK CPCENTRALOFFICE

PROGRAMDescriptionEnables system users to store numbers for access by feature buttons or code dialing.Multiline voice terminal users can program numbe

Special Characters (V2)The following special characters may be used in Repertory Dialing and Personal SpeedDialing numbers on R1V2 systems only:CHAR.

Programming ProceduresProgram mode may be entered either by dialing a code (#4) or by moving the Test/Programswitch to P (on voice terminals so equip

ConsiderationsThe Program feature allows users to assigntheir own Personal Speed Dial/FlexDSS/Repertory Dial numbers.This is particularly useful where

RECALLDescriptionSingle-line voice terminal users can obtain System 25 Recall Dial Tone by pressing theRECALL button (not all single-line sets have a

SECTION 2—FEATURES AND SERVICESThis section describes the System Features,Network Features, Data Features, StationFeatures, and Attendant Features of

REMOTE ADMINISTRATION INTERFACEDescriptionProvides dial-up access to the system’s administration port, either for a standard systemadministration term

REPERTORY DIALINGDescriptionAllows multiline voice terminal users to store a telephone number, account code, or featureaccess code in the system’s mem

Administration RequirementsVoice Terminal (Station Port):● Assign Repertory Dial (REP DIAL) buttons.Hardware RequirementsNone2-201

SEND ALL CALLS (V1)DescriptionAllows multiline voice terminal users whose calls are covered to temporarily direct someincoming calls to coverage and t

A covered station with Send All Calls activated will ring when called by itsindividual coverage station if there is only one coverage receiver for thi

SEND ALL CALLS (V2)DescriptionAllows multiline voice terminal users to turn off their ringers and invoke a “do not disturb”condition toward incoming c

If a station is translated to not send ringing to coverage when calls to this stationare unanswered, the Send All Calls feature overrides this instr

SPEAKERDescriptionAllows 7300 H-series voice terminal users to turn On a built-in speaker. The speaker allowson-hook dialing, group listening, and mon

SPEAKERPHONE ADJUNCTDescriptionThe speakerphone adjunct permits users of voice terminals not equipped with built-inspeakerphones to place and receive

The S101A Speakerphone must be powered locally with a 2012D Transformer that plugs intoa 115V ac receptacle.Adjunct power supplies are described in Se

System FeaturesSystem features (Table 2-A) are those that affect the entire operation of the system. Allsystem features are available with both Vl and

SYSTEM 25CABINETZTN79HYBRIDLINE CPPART OFOCTOPUS CABLE———PART OF SIPC2SIPW1C1VOICE●ADAPTB1TERMINALT1—————————LEGEND :B1 - TYPICAL-103A CONNECTING BLOC

SYSTEM 25CABINETZTN79HYBRIDLINE CPPART OFOCTOPUS CABLEPART OF SIP————VOICEZ400FC2C1SIPTERMINAL●ADAPTB1ADAPTT1————C7C8————PWRS102A————SUPPLYSPEAKERPHON

SYSTEM 25CABINETPART OFOCTOPUSCABLE———TN735———PART OF SIP●METC2●SIP400B2W1B1C1MET SETLINE CPADAPTADAPTT1———C7C8——————248B———ADAPT2012DTRANSLEGEND:B1 -

SPEED DIALINGDescriptionThere are twoDialing.System Speedtypes of Speed Dialing: (1) System Speed Dialing, and (2) Personal SpeedDialing:Allows the Sy

were dialed directly.This includes analysis of the number for the various types ofrestriction.This feature can also be used when entering account code

● Personal Lines: The Speed Dialing feature is not accessible from Personal Lines.● Repertory Dialing: Storing a System Speed Dialing code (#100 -#1

STARLAN NETWORK ACCESS (V2)DescriptionThe AT&T STARLAN NETWORK (STARLAN NETWORK) Access feature providesconnectivity between System 25 and a coloc

● Communications Access Manager (CAM)CAM is an MS-DOS applications program that provides an enhanced calling interfaceand terminal emulation for PCs c

The STARLAN NETWORK View of System 25From the STARLAN NETWORK, the STARLAN CP functions like a STARLAN NETWORKworkstation equipped with a Network Acce

Calls from STARLAN NETWORK to System 25A STARLAN NETWORK workstation accesses a host computer connected to System 25(either a local host or a remote h

Network FeaturesThis group of features (Table 2-B) supports communications with the public network andwith other locations in the private network of w

PART OFSIPC2IZTN78IITN742IW1IIB1IIA1A2❘ ZTN84 ❘2500C5SINGLE-SYSTEM 25 C2 LINE PHONE(LEG 1ONLY )NEU(STARLAN HUB)INSTARLAN WORKSTATIONINC1NAU -

PART OFSIPZTN79❘C2W1B1A1A2ZTN84SYSTEM 25ATLPHONEC1C2(LEG 1ONLY)C4T1A3INNEUINC1NAU -NEU -ZTN79 -ZTN84 -A1 -A2 -A3 -B1 -C1 -C2 -C3 -C4 -T1 -W1 -NOTE 1:P

ATL AdaptersThe ATL adapter (KS23475) is a connection block that provides: 48V dc power from T1 (viamodular cords C4 and Cl) to the ATL phone, data co

STATION HUNTINGDescriptionProvides linear, circular, or combinational hunting sequences for calls to busy single-linevoice terminals and data terminal

Interactions● Attendant Camp-On: When the attendant extends a call to a busy terminal in ahunt group, the call hunts for an idle terminal.If none is

STATION-TO-STATION MESSAGE WAITINGDescriptionAllows a multiline voice terminal to turn On a Message Waiting LED located on anothermultiline voice term

SYSTEM ADMINISTRATIONDescriptionThe software that controls System 25 operation consists of tables located in system memory.These tables contain data a

A significant advantage of the AAS package is that it can be used either at the samelocation or can be used remotely via a dial-up connection.Procedur

following characteristics:Display: The minimum display size is 16 lines by 80 columns. The port provides bothcarriage return and line feed characters

Figure 2-45. Model 703 System Administration Terminal2-228

Station FeaturesThe many Station Features (Table 2-D) available allow individual user needs to be met. Asthese needs change, assigned features can als

SYSTEM 25PART OFCABINETOCTOPUSCABLE———PART OFZTN82SIP———OR ZTN128C2Z210AC1CALL●ADAPT. 355A/AFPROCESSOR———SYSTEMADMINISTRATIONTERMINAL———LEGEND :C1 -

SYSTEM 25PART OFCABINETOCTOPUSCABLEZTN82———OR ZTN128C2●CALLPROCESSOR———PART OFSIPZ210AC1355AFC3Z3A4ADUC1ADAPT.ADAPT.PART OFSIPEQUIPPED WITH A THREE FO

SYSTEM 25PART OFCABINETOCTOPUSPART OFCABLEZTN82SIP———OR ZTN128C2Z210AC1C3Z3A4355AFCALL●ADAPT.ADAPT.ADUPROCESSOR———(PORT X)PART OFSIP———————❘TN726———❘C

SYSTEM 25CABINETPART OFCO OR PRIVATEOCTOPUSLINE CIRCUITCABLEPART OFCONNECT VIA TAE———SIPZTN82———OR ZTN128Z210A–CALLlADAPT.PROCESSOR———C1———355AF––TYPI

SYSTEM 25CABINET———————ZTN82OR ZTN128CALLPROCESSORTN758POOLEDMODEMTDMTN726BUSDATALINE———❘❘C2C1Z210A400B2●❘ADAPT.ADAPT. ❘❘C7———————2012D248B—TN742ANALO

SYSTEM MAINTENANCEDescriptionThe primary objective of System 25 maintenance is to detect, report, and clear troubles asquickly as possible and with mi

● Most Recent System Errors:The ten Most Recent System Errors are recordedby the system, regardless of their level of severity. These are stored in t

TANDEM TRUNKING (V2)DescriptionTandem trunking provides an enhanced networking capability for System 25. With thisfeature, tie trunks can be used to

—If the requested trunk pool is dial accessible, an outgoing trunk is selectedand the call proceeds normally.—If the requested trunk pool is not dial

TESTDescriptionProvides users of the 7300H series voice terminals the ability to test their terminals.Placing the Test/Program (T/P) switch in the “T’

Attendant FeaturesAttendant Features (Table 2-E) are available to the attendant using the Direct TrunkAttendant Console (DTAC) or the Switched Loop At

THIRD-PARTY CALL SETUP (V2)DescriptionThe Third-Party Call Setup feature allows a data terminal (the third party) in CommandMode to set up a call be

Setting Up A Third-Party CallTo set up a call from the third-party data terrninal, the user selects <Voice call> from theentry-level Command M

Interactions● Call CoverageThird-Party Call Setup calls to the source terminal will not be directed to a coveragestation. If the source terminal

TIE TRUNKSDescriptionProvides a private communications link between System 25 and another PBX.Incoming tie trunk calls may be directed to the attendan

● Assign Night Service Delay Announcement (1, 2, or 0 for none) - Default = 0● Dial-Inward Capability (Tone or Pulse) - Default = Pulse.Hardware Requ

TOUCH-TONE AND DIAL PULSE SERVICESDescriptionAll single-line voice terminals and MET sets are equipped with touch-tone dial pads thatgenerate Dual Ton

DescriptionAllows a user to transfer any call to another voice terminal.A user can transfer calls either with or without announcement. A multiline ter

calls over a transferred trunk.● Hold: An outside call placed on hold during call transfer receives music-on-hold, ifavailable. A user attempting to

TRANSFER TO DATADescriptionAllows multiline voice terminal users to originate or answer a call from their voice terminalsand then establish a data con

Preindication is canceled:●If the user goes on-hook before transferring the call to data●If the user preindicates on a second DATA button● If, after d

ACCOUNT CODE ENTRYDescriptionAllows voice terminal users to associate an account code with incoming and outgoing calls.This is accomplished by enterin

TRUNK GROUPSDescriptionAllows each trunk in the system to reassigned to one of up to 16 trunk groups.Trunks link two switching systems, such as System

Trunk groups connecting with a local CO, WATS office, or FX office can be ground or loopstart.DID trunk groups can be immediate or wink start. Tie tru

Administration RequirementsTrunk Port:● Assign Trunk Type And Number● Assign Class Of Service Code [DID - (l-4); Other - (0-15)]● Assign Facility Acce

TRUNK-TO-TRUNK TRANSFERDescriptionAllows users to connect incoming trunk calls to other outside trunks and then hang up(under certain conditions).Inco

USER CHANGEABLE OPTIONS (V2)DescriptionUser Changeable Options allows a data terminal user who is in the Command Mode to viewand change the settings o

(ENTRY LEVEL)DIAL:DIAL: <eXit> <All> DISCONNECTED<Data call><Voice call><Options><Hangup> <eXit> {Change o

Viewing OptionsWhen <View options> is selected, current and default values for the various data portoptions are displayed, as shown below:OPTI

Changing Data Port SpeedThe procedure for changing Speed settings is different from the procedure for changing thesettings of other options.Within the

● If the user selects <Enable options>,the system incorporates the changesrequested and displays the message DISCONNECTED. If Autobaud is of

VIRTUAL FACILITIES (V2)DescriptionA virtual facility (VF) is a call routing facility that is not defined by the physical facility(trunk) over which ca

Interactions● Conference: If more than one user attempts to enter an account code on aConference Call, the first to enter a code will prevail.●Repert

Whenever a VF is used to complete a call (either by dial access or through ARS), callprocessing treats the number as a physical facility for Station M

The “#5” indicates that the destination number should be inserted here,rather than at the end of the VF translation.—The “#*” indicates that the syste

—Since “#5” was not embedded within this VFN, the destination telephonenumber (12125551643) will be transmitted after the WATS access code.VF codes ma

LIST OF FIGURESFigure 3-1. System 25 Digital Switch. . . . . . . . . . . . . . . . .3-1Figure 3-2.Call Processor (ZTN82 or ZTN128) Circuitry . . . . .

LIST OF TABLESTABLE 3-A. TDM BUS Time Slots.3-83-343-34... . . . ...TABLE 3-B. Signaling Type Summary.. . . .TABLE 3-C. TN76

SECTION 3—FUNCTIONAL DESCRIPTIONThis section describes how the digital switch and the software of System 25 provide controland switching.Digital Switc

Common ControlThe Common Control circuitry consists of the Call Processor (ZTN82 in R1V1 or ZTN128 inR1V2) and Memory (ZTN81 in R1V1 or ZTN127 in R1V2

TO EMERGENCYEIA CHANNELSTRANSFER UNIT(RS-232C)(ETU)INTERRUPTCIRCUITRY/\——BUSERRORMICROPROCESSORCIRCUITRY—(68010)LED\TDMBUSLEADSSERIAL SERIAL SERIAL SE

Network Controller: The network controller transmits control channel messages betweenthe Call Processor and the port circuits over the TDM bus.The co

Memory Circuit Pack (ZTN81 or ZTN127)The Memory Circuit Pack provides for the storage of software associated with systemoperation. This software inclu

ATTENDANT CALL EXTENDINGDescriptionAllows the attendant to put a call in a special hold condition, call another station, thenconnect the two calls tog

Switching NetworkSystem 25 uses distributed processing techniques to provide switched voice and data services.The switch operates at 64 Kbps. The sw

Two time slots are required for each 2-party conversation.Each party transmits (talks) onone time slot and receives (listens) on another. Only five pa

TABLE 3-A. TDM BUS Time SlotsTime Slot No.00thru0405060708091011121314151617181920thru254255FunctionControl(5)-Tones-Dial ToneBusy ToneRe-order ToneRi

TDMBUSTERMINATORCARDTDM BUSEXTENDERCABLECABINET 3ON/OFFSWITCHAC POWER# 6 AWGBUILDINGGROUNDWIRECABINET 2AC POWER#6 AWGGROUNDWIRECABINET 1COUPLEDBONDING

Port CircuitsThe following port circuit packs provide the link between trunks and external equipment andthe TDM bus:● Analog Line (TN742)● ATL Line (Z

SINGLE-LINE VOICETERMINALS(420, 500, 2500, 2514,2554, 7101A)————————RECORDED ANNOUNCEMENTS————————DICTATIONEQUIPMENT————————EXTERNAL ALERTINGDEVICES——

SAT, DTU, SMDR,Z3A1Z3A4CAS (ON-PREMISESADUADUDIRECT CONNECTION)***REQUIRED FOR CONNECTIONS >50 FEETOR NOT SHARING SAME AC OUTLET———————————————SAT,

DATA TERMINALRS-232CEQUIPMENT,HOST COMPUTERZ3A1/2/4TN726DATA LINE CPADUSINGLE-LINEVOICE TERMINAL(2500-TYPE OR7101A)DATA TERMINALRS-232CEQUIPMENT,HOST

Eight port circuits are provided on most port circuit packs.The Multibutton ElectronicTelephone (MET) Line, Tie Trunk, and Auxiliary Trunk Circuit Pac

The NPEs do switching network functions for the port circuits. Under control of the on-board microprocessor, an NPE can connect a port circuit to any

FCC NOTIFICATION AND REPAIR INFORMATIONAT&T SYSTEM 25This telephone equipment is registered with the Federal Communications Commission (FCC)in acc

ConsiderationsAttendant Call Extending allows the attendant to utilize the additional attendant relatedfeatures such as Attendant Splitting One-Way (a

Ground Start Trunk (ZTN76)The Ground Start Trunk Circuit Pack interfaces eight central office trunks and the TDMbus. Figure 3-8 shows the following Gr

\NPE ONPE 1●❘PORTT.3❘❘●ON-BOARDMICROPROCESSORPORT1/0CIRCUIT●●PORT●CIRCUIT●4R.4GROUNDDETECTORPORTCIRCUIT0CODECHYBRIDT.OR.OCIRCUIT3R.3T.4TOCENTRALOFFICE

Loop Start Trunk (ZTN77)The Loop Start Trunk Circuit Pack interfaces eight central office loop start trunks and theTDM bus.Figure 3-9 shows the follow

\NPE O●NPE 1❘❘❘ON-BOARDMICROPROCESSORPORTCIRCUIToCODECHYBRIDPORTI/OCIRCUITT.O R.OT.3PORTCIRCUIT3R.3●●T.4●PORT●CIRCUIT●4R.4❘●❘❘T.7PORTCIRCUIT7R.7Figure

Tip Ring Line (ZTN78)The Tip Ring Line Circuit Pack interfaces eight analog tip and ring voice terminal lines(single-line voice terminals) and the TDM

Ringing Application Circuit:This circuit receives ringing voltage from the power supply.It monitors ringing voltage and current and generates signals

ATL Line (ZTN79)The ATL I,ine Circuit Pack interfaces eight hybrid voice terminal (7300H series) lines andthe TDM bus. It terminates three pairs of wi

\/NPE 0❘❘❘T.3R.3PORTTXT.3CIRCUITTXR .33PXT .3T.4R.4PORTTXT .4CIRCUIT TXR.44PXT.4PXR.4❘❘T.7R.7PORTTXT.7CIRCUITTXR .77PXT.7●\DATATRANSCEIVERPROTOCOLHAND

Data Line (TN726)The Data Line Circuit Pack interfaces eight Asynchronous Data Units (ADUs) data devicesand the TDM bus.The ADUs are typically, in tur

\/●NPE0●\●●ON-BOARDMICROPROCESSOR●●/●●NPE1APORTCIRCUIT0ASYNCHRONOUSPXT.OPROTOCOLDATAPXR.0HANDLERUNITTXT.0(OATMEAL)(ADU)TXR.0APORTCIRCUIT1APORTCIRCUIT2

ATTENDANT CAMP-ONDescriptionAllows the attendant to extend a trunk call to a busy voice terminal and leave it waiting or“camped on”there. After hearin

MET Line (TN735)The MET Line Circuit Pack interfaces four Multibutton Electronic Telephone (MET) linesand the TDM bus. The MET Line unique circuitry c

\●●ON-BOARDMICRO-PROCESSORNPEPORT CIRCUIT0ANALOGPORTDIGITALPORTELECTRONICPOWER FEEDT.OR.OBT.OBR.OLT.OLR.O❘● ❘❘T.3TO METTERMINALSR.3PORT CIRCUITBT.3●3B

Analog Line (TN742)The Analog Line Circuit Pack interfaces eight analog voice terminal lines and the TDM bus.Figure 3-14 shows the following Analog Li

Ringing Application Circuit: This circuit receives ringing voltage from the power supply.It monitors ringing voltage and current, generates signals t

DID Trunk (TN753)The DID Trunk Circuit Pack interfaces eight central office trunks arranged for DirectInwrd Dialing ((DID) and the TDM bus.Figure 3-15

\NPE ONPE 1ON-BOARDMICROPROCESSORPORTCIRCUIT0TRUNKINTERFACEUNITT.OCODECHYBRIDR.O●❘❘❘PORTPORTT.3CIRCUIT3R.3I/O● ●CIRCUIT●●●PORTT.4CIRCUIT4R.4●●❘❘❘PORTT

Tie Trunk (TN760B)The Tie Trunk Circuit Pack interfaces four 6-wire tie trunks and the TDM bus. Two tip andring pairs form a 4-wire analog transmissio

\NPE❘●ON-BOARDMICRO-PROCESSORT.OPORTI/OCIRCUITGROUNDDETECTORPORTCIRCUIT0R.OT1.0R1.OE.O●M.0❘❘❘●T.3R.3PORTT1.3CIRCUITR1.33E.3M.3/Figure 3-16. Unique Tie

TABLE 3-B. Signaling Type SummarySIGNALINGTRANSMITRECEIVETYPEON-HOOK OFF-HOOKON-HOOKOFF-HOOKI Std.grdbat open/bat (*)grdI Compat.open/bat (*)grdgrd op

Auxiliary Trunk (TN763)The Auxiliary Trunk Circuit Pack interfaces four ports provided for client-providedequipment (CPE) and the TDM bus. It is conne

Administration RequirementsSystem:● Number of seconds before a camped-on call returns to the Attendant Console (1-120seconds) or No Attendant Camp-On

\NPE●ON-BOARDMICROPROCESSORPORTI/OCIRCUITGROUNDDETECTORT.OR.O●PORTS.0CIRCUITS1.00SZ.0SZ1.0IIIIITOAUXILIARYEQUIPMENT●❘T.3R.3PORTS.3CIRCUITS1.33SZ.3SZ1.

STARLAN Interface (ZTN84) (V2)The STARLAN Interface (ZTN84) is a System 25 circuit pack (CP) designed to function aseither a gateway or a bridge betwe

System ResourcesThe System Resource Circuit Packs (CP) are as follows:● Service Circuit (ZTN85)● Tone Detector (TN748)● Pooled Modem (TN758).Service C

generator and time slot table circuits with the TDM bus.Tone Generator:The tone generator consists of a digital signal processor (DSP), acounter, and

TONEGENERATOR(DSP)TONETIMETABLESLOT(DPRAM)TABLE(DPRAM)TDMBUSBUSBUFFER●LEADS●SAKI●CIRCUITPACKADDRESSLEADS●●LEDsNETWORKBUSREDYELLOWGREENRAMADDRESS &

Tone Detector (TN748)The Tone Detector Circuit Pack provides four touch-tone receivers and two general purposetone receivers that detect appropriate s

/❘●❘PORT CIRCUIT❘●NPE1●1PORT\●CIRCUIT 7●PORT CIRCUIT4●●RAM●PORT CIRCUIT/5●❘ON-BOARDPORT❘SAKI●MICRO-I/O●PROCESSORCIRCUIT❘● PORT CIRCUIT \/\\●NPEPORTTDM

Pooled Modem (TN758)The Pooled Modem Circuit Pack supports 0-300 and 1200 bits per second (bps) data speedsand provides the following:● Circuitry to p

Common Circuitry: The Pooled Modem common circuitry that includes all circuitry shownon Figure 3-21 except the Conversion Resource circuitry provides

SoftwareThe System software consists of switched services, administrative, and maintenancesoftware. This software runs on top of the real-time operati

ATTENDANT CANCELDescriptionAllows the attendant to terminate an attempt to extend any incoming call if the calledstation does not answer, or if the st

Traffic load, defined as the sum of static and dynamic loads, is a function of the number offeatures that are executed, the frequencywith which they a

Error Logger:Prioritizes and stores system errors.The errors are stored in three errorrecords (located in System RAM), that are:●Permanent System Alar

`/FEATURE CODE MODULES\MEMORYSTATIONCIRCUITSMDRADMINISTRATIONCALL● ● ●PACK(TASK)PROCESSINGPROCESSING(TASK)(TASK)▲▲▼▼SYSTEM RAMERRORCALL PROCESSOR LOGG

6. The Station Call Processing task retrieves its message and interprets it as a callorigination.The task determines whether there is an idle call app

LIST OF FIGURESFigure 4-1.System 25 Cabinets (J58901A)—Three Cabinet System . . . . . .4-2Figure 4-2. System Cabinet (J58901A)—Rear View . . . . . . .

Figure 4-29. Typical ADU Connections—Supporting Data Terminal And 7300H SeriesMultiline Voice Terminal . . . . . . . . . . . . . . . . .4-60Figure 4-3

SECTION 4—HARDWARE DESCRIPTIONThis Section provides descriptions of System 25 hardware components and their functions.The hardware is covered under th

The front cover of the cabinet is secured by four screws.These screws must be loosenedslightly before the cover can be removed.When removed, access is

Each cabinet has its own power supply mounted to the left of the CP carrier. The powersupply is 3 inches wide and weighs about 9 pounds.Voltage and cu

Cabinet 1 (Control and Port Circuits)Cabinet 1 (Figure 4-3) is always required.It provides mounting space for 12 CPs and cansupport a small telecommun

ATTENDANT CONSOLE, DIRECT TRUNKDescriptionIn System 25, the Attendant Console is used to answer incoming trunk calls that are notdirected to specific

CIRCUIT PACK SLOTS1 2 34567 89101112POWERPORT CIRCUITSSERVICE CIRCUITCALL PROCESSOR(a) CABINET 1 -(MOUNTING FOR 3 CONTROL & 9 PORT CIRCUIT PACKS)C

TABLE 4-A. Total Port Circuit Packs Per SystemNUMBERPORTTOTAL PORTOFCABINETCIRCUITCIRCUITCABINETSNUMBER *PACKSPACKS †1Cabinet 19 92Cabinet 1921Cabinet

Circuit PacksRequired Circuit Packs:The following CPs are provided with all systems and must be mounted in Cabinet 1:● ZTN82 (V1) or ZTN128 (V2) Call

● TN758 Pooled ModernProvides two integrated 212-modem compatible conversion resources for switchedconnections between analog endpoints (modems), or a

Trunk Port Circuit Packs● TN753 DID TrunksProvides eight ports for immediate-start or wink-start Directtrunks.● TN760B Tie TrunksInward Dialing (DID)P

Circuit Pack FeaturesAll system CPs have the following features:● Solid-state circuitry mounted on 7.6 by 14.1-inch printed wiring board (TN-type)● C

Table 4-B lists CPs that can be used with System 25. A description of each CP is provided inSection 3, Functional Description.TABLE 4-B. System Circui

Terminal EquipmentTerminal equipment is connected to System 25 station (voice or data) ports. It is made up ofthe following groups:● Voice Terminals—S

TABLE 4-C. Summary of Voice TerminalsTERMINALCIRCUIT PACKTYPE * MODELDESCRIPTION INTERFACE420Memory Set W/Built-In Speakerphone500MMRotary Desk SetZTN

Model 2500 SeriesEach of the following Model 2500 voice terminals come equipped with:● Handset● Touch-Tone Dial (Dual Tone Multifrequency - DTMF)● Ri

● Return-On-Don’t-Answer [RTN-DA]: Extended calls not answered are returnedto the console on this button if not answered within a specified interval.

Model 7101A (MD) (PEC 3170-00M)The Model 7101A (Figure 4-5) is about 2-3/4 inches wide, 3-1/2 inches high, and 8-1/2 incheslong. The set comes equippe

420 Speakerphone (V2)The 420 Speakerphone (Figure 4-6) is a single-line voice terminal that can be desk or wallmounted. This set comes equipped with t

MEMORYBUTTONSREDIALBUTTONPROGRAM BUTTONFLASH BUTTONHOLD BUTTONSPEAKERPHONE BUTTONAND LAMPMUTE BUTTONVOLUMESPEAKERRECEIVERCONTROLVOLUMEVOLUMECONTROLCON

TABLE 4-D. Model 2500 Series Voice Terminal AdjunctsAdjunct2500DMGC 2500MMGB2500SM 2514 BMW2554BM4A Speakerphonex55A1 Groundx xxx xStart KeyAT&T A

Multiline Voice TerminalsThe system supports MET (10- and 12-button only) and MERLIN (7300H Series) multilinevoice terminals.Multiline voice terminals

5-Button Voice Terminal (7302H01D) PEC 3160-111The 5-Button Terminal (Figure 4-7) can be desk or wall mounted and is about 5-3/4 incheswide, 5-1/4 inc

I-USE/STATUS LEDsHANDSETSYSTEM ACCESSTEST/PROGRAMPROGRAMMABLESWITCHFEATUREBUTTONS❑CONFERENCE❑SPEAKER/RINGTRANSFERHOLD❑DROP❑VOLUME CONTROLSWTICHTOUCHDI

10-Button Voice Terminal (7303H01D) PEC 3161-172The 10-Button Terminal (Figure 4-8) can be desk or wall mounted and is about 7 inches wide,5-1/4 inche

I-USE/STATUS LEDs SYSTEM ACCESS (2)PROGRAMMABLEFEATURE BUTTONS (3)TEST/PROGRAMSWITCH PROGRAMMABLEFEATUREHANDSETBUTTONS (5)❑CONFERENCE❑TRANSFERTOUCH DI

34-Button Voice Terminal (7305H01D) (MD) PEC 3162-412The 34-Button Terminal (Figure 4-9) can be desk or wall mounted and is about 10-1/4 inches,5-1/2

terminations on the rightmost two columns of buttons of the inactive console. Ringersdisabled on an inactive console will be enabled on the active con

I-USE/STATUS LEDsSYSTEM ACCESS (2)HANDSETPROGRAMMABLE FEATUREBUTTONS (3)TEST/PROGRAMSWITCHTOUCHDIALPADSPEAKER/RINGVOLUME CONTROLSWITCHMESSAGESPEAKER❑C

34-Button Deluxe Voice Terminal (7305H02D) PEC 3162-417The 34-Button Deluxe terminal (Figure 4-10) is available for general use and as a DirectTrunk A

default assignments.† On the primary Attendant Console, the first of the Direct Facility (Pooled) Accessbuttons defaults to loop-start trunks, the sec

Built-In Speakerphone (BIS) Voice Terminal (7305H03B) PEC 3162-BISThe BIS voice terminal (Figure 4-10) can be desk or wall mounted and is about 9-1/2

HANDSETI-USE/STATUS LEDsSYSTEM ACCESS (2)PROGRAMMABLEFEATUREBUTTONS (3)TEST/PROGRAMSWITCHTOUCH DIALPADSPEAKER/RINGVOLUME CONTROLSWITCHPROGRAMMABLEFEAT

Built-In Speakerphone (BIS) Voice Terminal With Display (7305H04C) PEC 3162-DIS (V2 only)The BIS Voice Terminal with Display (Figure 4-12) is availabl

For Use as a Switched Loop Attendant Console:—Five predefined as loop buttons—Twelve other predefined (Inspect, Attendant Message Waiting, Alarm, Loca

Hands-Free-Answer On Intercom (HFAI) Voice Terminal (7309H01B) PEC3161-161The HFAI voice terminal (Figure 4-13) can be desk or wall mounted and is abo

I-USE/STATUS LEDsHANDSETSYSTEM ACCESS (2)TEST/PROGRAMSWITCHPROGRAMMABLEFEATURE BUTTONS (3)TOUCH DIALPADPROGRAMMABLEFEATURE BUTTONS (5)SPEAKER/RINGVOLU

Ten Button Multibutton Electronic Telephone (MET) (2991 C/D05)The Ten Button MET set (Figure 4-14) may be desk or wall mounted. This set is available

—Release● Trunk terminations–The following is required for each trunk terminated on theconsole (administered as Personal Line appearances; DID trunks

TOUCH TONEDIALPADHANDSETRECALLINDICATORBUTTON LAMPSSYSTEM ACCESSPROGRAMMABLEFEATURE BUTTONSMESSAGE WAITINGDROPCONFERENCETRANSFERHOLDFigure 4-14. Ten B

Ten Button MET With Built-In Speakerphone (2993C04)The 10-Button MET set with BIS (Figure 4-15) can be desk or wall mounted. This set isavailable on

TOUCH TONEDIALPADSYSTEM ACCESSPROGRAMMABLEFEATURE BUTTONSHANDSETON/QUIETBUTTONON LAMPSPEAKERPHONEOFF BUTTONVOLUMERECALL INDICATORCONTROLBUTTONLAMPS/❑

Twelve Button MET Set (7203M)The 12-Button MET set (Figure 4-16) is a freestanding voice terminal. This set is availableonly on a reuse basis and is

❑ HOLDI-USE/STATUS LEDS❑ TRANSFER❑ CONFERENCE❑ DROP❑ MESSAGEHANDSETTOUCH TONEDIAL PADTONE RINGERVOLUMECONTROLDISCONNECTRECALL❑ (PROGRAMMABLE)❑ (PROGRA

Multiline Voice Terminal Connection InformationDetailed connection information is provided in the following figures:●Figure 4-24—On-Premises 7300H Ser

Voice Terminal Adjunct Connection InformationDetailed adjunct connection information is provided in Section 2 with the detailed featuredescriptions of

Asynchronous Data Units (AD US)Asynchronous Data Units, and Multiple Asynchronous Data Units (MADUs), provide aninterface between ports on the TN726 D

RS-232CCONNECTORINTERFACETELEPHONEJACKWALLJACKOPTIONALORIGINATE/DISCONNECTSWITCHFigure 4-17. Asynchronous Data Unit (ADU)ADU Connection InformationDet

TABLE 4-F. Asynchronous Data UnitsUNITPECFEATUREZ3A12169-0013-foot plug-ended EIA connector andmod jack for single-line set.Z3A2 2169-002EIA plug and

ATTENDANT CONSOLE, SWITCHED LOOP (V2)DescriptionIn System 25, the Attendant Console is used to answer incoming trunk calls that arespecified to ring a

Peripheral EquipmentPeripheral Equipment is equipment that connects to the Call Processor (ZTN82 or ZTN128)CP, including:●●●System Administration Term

AC Power Line Surge SuppressorThe TII Model 428 Self-Restoring Powerline Surge Suppressor (PEC 8310-001, Comcode402988950) protects against electrical

trunk CPs (except Tie Trunk CPs) can be connected to a three-way splitter cable (OR6016)that concentrates the CP interfaces into one 25-pair cable. Up

Station Interconnect Panel (SIP)The Station Interconnect Panel (SIP) provides for the connection of the terminals (voice anddata), peripheral equipmen

NOTEMODULARJACK ROWNUMBER28 1/16”PURSELOCKCLIPADAPTERMOUNTINGCLIPBUILDINGWIRING RINGCOLUMNLETTERBOXNOTE 10” WIDE, 9 1/2” MOUNTINGOCTOPUS CABLECENTERS

Figure 4-20 shows voice terminal connections to the system cabinets via the SIP. Typically,voice terminals are plugged into modular wall jacks that pr

Connectivity FiguresFigures 4-21 through 4-31 provide connection information for various equipment. Thesefigures have been included as an aid to under

SYSTEM 25CABINETPART OFOCTOPUSPART OFCABLESIPZTN78———SINGLE-LINEC2SIPW1C5ORVOICE●B1TN742ADAPT.TERMINAL———(NOTE)——————LEGEND:ZTN78 – TIP RING CPTN742–

SYSTEM 25PART OFCABINETOCTOPUSCABLEEXPOSEDCABLE———TN742———ANALOGC2SIPW1D1D1●ADAPT.LINE CP——————GG———SINGLE-LINEVOICEC5TERMINALB1(NOTE)LEGEND:B1– TYPIC

PART OF TAESYSTEM 25PART OF700A NETWORKCABINETOCTOPUSINTERFACE BLOCKCABLE(110- OR 66-TYPE)———PART OFNETWORKTN742ANALOGLINE CP———SIPINTERFACEC2SIPW1A●A

In addition to the LOOP buttons and standard multiline terminal buttons (HOLD,TRANSFER, etc.), the console is equipped with the following feature butt

SYSTEM 25PART OFCABINETOCTOPUSCABLE———PART OF———SIPZTN79C2●SIP W1 B1VOICEATLADAPT . TERMINALLINE CP___T1———TYPICAL-103A CONNECTING BLOCK*MODULAR CORD

SYSTEM 25CABINETZTN79ATLLINE CPPART OFEXPOSED CABLEOCTOPUS CABLE————I●PART OF SIPIROBIROB————C2SIPC1PROTECTIONPROTECTIONADAPTTII 341TII 341————(NOTE 1

SYSTEM 25CABINETPART OFOCTOPUSCABLEPART OF SIPTN735———W1400B2METC2SIP●C1/C9METADAPT.B1ADAPTSETLINE CP——————C7———248BADAPT2012DTRANSLEGEND :B1– TYPICAL

SYSTEM 25PART OFCABINETOCTOPUSCABLE PART OF———SIPZTN79———C2451A Z400FC1HYBRID●SIPADAPT.ADAPT.ADAPT.LINE CP——————C7W1MBPSP27300HSERIESC1VOICE B1TERMINA

SYSTEM 25 PART OFCABINETOCTOPUSCABLEPART OF SIP———ZTN78C2OR●TN742———ADAPTSIP M1Z3A1———B1(WP90851-L1) ADAPTADU———TN726C2●———RSS232———TERMINALLEGEND:ZTN

SYSTEM 25PART OFCABINETOCTOPUSCABLEPART OF SIP———ZTN79C2ATL●LINE CP———Y ADAPT———(WP90851-L1)TN726———W1B1DATAC2●LINE CP——————RSS232LEGEND :WP90851-L1 -

SYSTEM 25CABINETTN726MADUC10W2C11/C12HOSTCOMPUTERORTERMINALSLEGEND :TN726 – DATA LINE CPMADU – MULTIPLE ASYNCHRONOUS DATA UNIT (PEC 2169-005)SINGLE UN

TO RS-232C DEVICEOPTIONAL SINGLE-LINEAC POWEROUTLET2012D POWERTRANSFORMER400B2 ADAPTERWALL JACK248B ADAPTERD6AP-87 CORD4-PAIRD8W CORD(PEC 2725-07G)D8A

SECTION 5—TECHNICAL SPECIFICATIONSThis section provides information on the technical characteristics and capacities of thesystem. Some items covered h

Hardware And Software ParametersThe following is a listing of maximums for hardware and software parameters.ITEMTOTALAttendant ConsolesDirect Trunk Te

RIGHTS OF THE TELEPHONE COMPANYIf your telephone equipment causes harm to the telephone network, the telephone companymay discontinue your service tem

● Manual Signaling● Transfer to Data● Account Code Entry● Auto Intercom● Auto Answer● Direct Facility Access● Direct Station Selection (DSS)●

Hardware And Software Parameters (Contd)ITEMTOTALDirect Group Calling (DGC)Groups32Members per group10Emergency Transfer Units (ETUs)4Voice Terminals

Hardware And Software Parameters (Contd)ITEMTOTALTraffic Data● Simultaneous 2-Party Conversations115● Call Capacity–CCS/Hour4140–Busy Hour Call Capaci

Unit LoadsA cabinet can supply no more than 80 unit loads of 48 volt power (a unit load is defined as44 mA). Unit loading is determined by the termina

Cable Distance LimitationsThe following specifications provide allowable cabling distances for the following devices:● Single-Line Voice Terminals● Mu

Multiline Voice TerminalsSUPPORTINGCIRCUITPACKZTN79(7300H Series–in-building orout-of-building,no off-premises)24-GAUGE WIRE(0.5106mm)FEET2,000(Note)M

Data Terminals (RS-232) Connected To Asynchronous Data UnitsDATA RATE● 300 bps● 1,200 bps● 2,000 bps● 4,800 bps● 9600 bps● 19,200 bps24-GAUGE WIRE(0.5

TonesThe following call progress tones are generated by the system:TONEFREQUENCYPATTERN (In Milliseconds)Busy Tone480 Hz + 620 Hz 500 on, 500 off; rep

Port SpecificationsThe following tables provides interface specifications for System 25 line and trunk portcircuits: supported by System 25:DATA TERMI

Port Specifications (Contd)DATA TERMINALS(Do Not Require Local Power)DATA REQUIRES Z3A1 REQUIRESTERMINAL or Z3A2 ADU Z3A4 ADUAT&T4410 X4415 X51OAX

Port Specifications (Contd)VOICE TERMINAL PORTSSTATION TYPECIRCUIT PACKSPECIFICATIONSTip and RingTip Ring LineSingle-Line Sets(ZTN78)● l-Pair Interfa

Switched Loop OperationAll calls that are intended for an attendant position are first routed by the system to acommon queue where they wait to be sen

Port Specifications (Contd)VOICE TERMINAL PORTS (Contd)STATION TYPECIRCUIT PACKSPECIFICATIONSMET SetsMET Line(Hybrid)(TN735)● 3-Pair Interfacel-Voice

Port Specifications (Contd)TRUNK PORTSTRUNK TYPECIRCUIT PACKSPECIFICATIONSAuxiliary TrunkTN763● Capacity: 4 Circuits● 3-pair interface:Voice (T,R),Sig

Port Specifications (Contd)TRUNK PORTSTRUNK TYPECIRCUIT PACKSPECIFICATIONSGround StartZTN76● Capacity: 8 CircuitsTrunk● 2-Wire (600 Ohms or RCBalance)

Recommended Central Office Trunk FacilitiesThe following table provides recommendations for CO trunks based on the number of voiceterminals in the sys

Analog Transmission CharacteristicsFrequency Response:(Station-To-Station or Station-To-CO-Trunk, relative to loss at 1 kHz)FREQUENCY60 Hz200 Hz300-30

Analog Transmission Characteristics (Contd)Sampling Rate:8 kHzTerminating Impedance:600 ohmsTrunk Balance Impedance:600 ohms or Complex Z (selectable)

SECTION 6—ENVIRONMENTAL REQUIREMENTSThis section provides information on floor and wall space requirements for System 25cabinets and associated periph

SYSTEMCABINETS(FOOTPRINT)FRONTNOTE 3BACKBOARDTERMINATIONFIELD(NOTE 4)TABLENOTES:1. 115V AC, 60 Hz, 15 AMP OUTLETS(HUBBELL 5262 OR EQUIVALENT)MUST BE L

QUAD AC OUTLETSFigure 6-2. Typical System 25 Equipment Area Elevation Plan6-3

Table Top SpaceThe following system equipment requires (customer provided) table top space in theequipment area:● System Cabinets - Each cabinet is 1

An incoming call from the queue to a console appears on one of the five LOOP buttons; theattendant is alerted to the call by audible ringing, a stead

Air PurityThe cabinet should not be installed in an area where the air may be contaminated with anyof the following:● Excessive dust, lint, carbon pa

AC Power Requirements● The System 25 power service shall be a dedicated branch circuit with no otherequipment served (See Figure 6-3. )● Each cabinet

TWO SEPARATELY FUSEO15 AMP CIRCUITSITE:QP1 - B015TWO 15 AMP CKTBAKA ORAPPROVEDEQUIVALENTNEUTRALINSULATED FROMLOAD ENTERLOAD CENTERSINGLE POINT\/TO 240

GroundingConnection of an approved ground to the system cabinets is essential. An approved groundmay consist of any of the following:● Grounded Buildi

SECTION 7—PARTS INFORMATIONThis section contains information that may assist you in cross referencing Apparatus Codes,Comcodes and Price Element Codes

PECDESCRIPTIONAPPARATUS CODE6250262503625046250562506Part of:6250662506625076250862509Part of:6250962509625096250962510Part of:62510625106251062511Par

COMCODEPEC62513Part of:62513625136251362514Part of:625146251462515Part of:625156251562515625156251562515625156251562515625156251862519Part of:62519625

PEC63118†63119†63123†63130†1020-S901020-S911203-0202169-0012169-00421691Part of:2169121691216912301-SAA2610-0012614-1002720-05P2720-05X2720-06X2724-30

PECDESCRIPTION APPARATUS CODECOMCODE2750-A242750-A252750-T052781-JDX2782-JA12782-JA22782-JC12783-JDX3100-1TD3100-TWR3178-SYS*3100-2TD3100-ORD3100-ORW3

PECDESCRIPTIONAPPARATUS CODECOMCODE3141-BISPart of:3141-BIS3141-BIS3143-12M3160-111(MAC30 Att)3161-172(MAC30 Att)3161-1613162-4123162-417(MAC30 Att)31

from the common queue while the console is unavailable. If this is not done, the buttonshould be reassigned to another of the permissible features.In

PECDESCRIPTIONAPPARATUS CODE COMCODE8310-001AC Power Surge402988950SuppressorTII Model 428MiscellaneousNo PECFanning Strip50A105196604No PECBlock, Con

Parts Listed by COMCODEThroughout the following table, “part of” is abbreviated as “P/O.”COMCODE PECDESCRIPTIONAPPARATUS CODE100009968P/O 62511Auxilia

COMCODEPECDESCRIPTIONAPPARATUS CODE1035570621035571121035571611035589161037563341037867861037868021037868281038105861038143561038235551038420501038435

COMCODEPECDESCRIPTIONAPPARATUS CODE1038814211039421461039428571039633101039639631039641851039652321039652401039652571039652651039652811039652991039653

COMCODEPECDESCRIPTIONAPPARATUS CODE1039819811039820051039826581039827401039841181040100611041525581041544301041747501041747681042466161050126371050126

COMCODE10533565710533958410534121810534138210535537440298895040324263940361300340383662040386415040395476140395712940396151940407942840407943640501061

COMCODE PECDESCRIPTIONAPPARATUS CODE405462904P/O 625205278400032610-001527840102 2614-100845412956No PEC845416379P/O 6250-011P/O 6250-012P/O 625018454

SECTION 8—REFERENCE DOCUMENTATIONSystem 25 is supported by a complete set of basic and supplementary documentation andoptional software. This section

Optional Software● Advanced Administration Software Package● Communications Access Manager Software Package● AT&T STARLAN NETW0RK ACCESS Software

Planning ManualThe document is a presale workbook used by the Account Team and customer to define a setof orderable equipment that will meet the custo

Call OriginationsPlacing a new call from an active console causes interactions with the currently active call.At a console that has the default Automa

SECTION 9—GLOSSARYThis section provides explanations for acronyms and definitions of terms used in thismanual.ADU: (Asynchronous Data Unit)ARS: (Aut

Attendant Console●Direct Trunk or Switched Loop Attendant Console: An electroniccall-handling positionwith pushbutton control.Used by attendants toan

Bus, Time Division MultiplexSee Time Division Multiplex Bus.CCS (Hundred Call Seconds)A traffic-measuring unit that expresses the load of one or more

ConsoleSee Attendant Console.Coverage CallA call that is redirected from the called party’s personal dial code to an alternateanswering position when

Data ModuleA data interface device (i.e., Asynchronous Data Unit) providing a standard interfacebetween customer provided data equipment and a data po

Facility (physical)A transmission channel to another switching system; to a Central Office for example.By application, examples are:● CO Trunks● FX Tr

Home Numbering Plan Area Code (HNPA)The local area code. The area code does not have to be dialed to call numbers withinthe local geographical area.Im

Modem PoolingProvides shared-use conversion resources that eliminate the need for a dedicatedmodem when an analog data end point accesses, or is acces

ParameterAny set of physical properties whose values determine the characteristics orbehavior of somethingPeripheral EquipmentSystem Administration Te

ProtocolA set of conventions or rules governing the format and timing of message exchangesto control data movement and correction of errors.Public Net

● Assign call type priorities and attendant specification.● Assign call types and attendant specification for Message Center-Like operation in atwo

SoftwareA set of computer programs that accomplish one or more tasks.SplitA condition whereby a caller is temporarily separated from a connection with

Tie TrunkA telecommunications channel that directly connects two private switching systems.Time Division Multiplex BusA special bus that is time share

Write OperationThe processor putting information onto a storage medium such as magnetic tape.800 ServiceA service that allows incoming calls from a ce

INDEX500 Voice Terminals, 4-12Auxiliary Equipment (Contd.)55A1 Key, 4-40Connections, 4-51Auxiliary Trunk (TN763), 3-35Abbreviated Alerting, 2-132

Connections, (Contd.)Peripheral Equipment, 4-51Voice Terminal and Adjuncts, 4-51Connectivity, 4-46Figures, 4-51Console,Direct Trunk Attendant, 2-1

Line (Contd.)Status and I-Use Indications, 2-157Lines, Personal, 2-184Loop Start Trunk (ZTN77), 3-18MaintenanceManual, 8-2Software, 3-45System,

Speaker, 2-206Speakerphone Adjunct, 2-207Speed Dialing, 2-212Splitting One-Way Automatic, Attendant, 2-47STARLAN INTERFACE(ZTN84), 3-37Circuit Pac

ATTENDANT DIRECT EXTENSION SELECTIONDescriptionPermits the attendant to extend calls to stations by pressing one or two buttons instead ofpressing STA

\908070❑60504030❑20❑1000❑❑❑❑9181716151❑4131❑211101❑❑❑❑❑❑9282❑726252❑4232221202❑❑❑93837363❑53❑4333❑231303❑ ❑❑❑❑❑❑❑❑❑❑❑❑❑❑❑❑❑❑❑❑❑❑❑❑❑❑❑100 DXS❑❑❑ ❑❑❑ ❑

The rightmost button on the bottom of the console is a Test button. When it is pressed, allDXS LEDs will light sequentially; a second press allows ind

Administration RequirementsSpecial Feature Ports:● Requires a port assignment on a ZTN79 ATL Station Circuit Pack (CP) for eachSelector Console.● Ass

FCC WARNING STATEMENTFederal Communications Commission (FCC) Rules require that you be notified of thefollowing:● This equipment generates, uses, and

ATTENDANT DISPLAY (V2; SLAC Only)DescriptionProvides displays of call-related information on a 16-character screen at the top of theSwitched Loop Atte

p for Call Parko for not logged-in FPDC.● Number of calls waiting in the common queue (l-9 or ! for 10 or more)● Trunk identification for incoming out

Returning parked call:I}801 Park4The call parked on extension 801 at the Selector Console is returning to the attendant.Call from console to system us

The call from Carter has been split while the call is extended. After the attendant dials thedesired PDC, screen 1 displays called party identificatio

Pressing any button other than thoselisted above causes a message such as “NOINFORMATION” to be displayed.Timer FunctionsThe LOCAL button allows the a

ATTENDANT FORCED RELEASE (V2; SLAC Only)DescriptionDrops all active parties from a call in which the attendant and one or more other parties areconnec

ATTENDANT JOIN (V2; SLAC Only)DescriptionAllows the attendant, while extending an incoming call, to connect together the callingparty, the called part

ATTENDANT MESSAGE WAITINGDescriptionAllows the attendant to remotely control the status of Message LEDs on user stations.ConsiderationsThis feature al

ATTENDANT POSITION BUSYDescriptionAllows an Attendant Console to be placed in an inactive mode.Systems with Direct Trunk Attendant Console(s) (DTAC)Th

A console in Position Busy mode can receive attendant PDC, DID, and DGC calls, andoutgoing calls can still be placed. Local functions can be activated

CONTENTSSECTION l—OVERVIEWSECTION 2—FEATURES AND SERVICESSECTION 3—FUNCTIONAL DESCRIPTIONSECTION 4—HARDWARE DESCRIPTIONSECTION 5—TECHNICAL SPECIFICAT

. Personal Lines (Trunk Appearances) on DTACs : All calls to trunks having anappearance in either of the two leftmost button columns will ring normal

ATTENDANT RELEASEDescriptionReleases the attendant from an extended call. There are two forms of Attendant Release:Manual and Automatic. This feature

Interactions● Attendant Camp-On: External calls that are released when Busy Tone is heardwill be camped on.Administration RequirementsNone.Hardware R

ATTENDANT RETURN COVERAGE ON BUSYDescriptionAllows a camped-on call at a busy station or DGC Group to be returned to the attendant forservice after a

. Send All Calls (DTAC only): If Send Alring at the DTAC.Administration RequirementsSystem:Calls is activated, returning calls will. Assign number of

ATTENDANT RETURN COVERAGE ON DON’T ANSWERDescriptionAllows unanswered calls extended by the attendant to be returned to the attendant foradditional se

call).● Send All Calls (DTAC only): If Send All Calls is activated, returning calls willring at the DTAC.Administration RequirementsSystem:●Assign n

ATTENDANT SOURCE AND DESTINATION (V2; SLAC Only)DescriptionAllows the attendant, while extending a call, to switch back and forth between the callingp

ATTENDANT SPLITTING ONE-WAY AUTOMATICDescriptionAllows the attendant to converse privately with a called party while the calling party is splitaway on

ATTENDANT SYSTEM ALARM INDICATIONDescriptionProvides an Alarm on the Attendant Console to alert the attendant to problems detected bythe system softwa

SECTION 1—OVERVIEWThis reference manual provides general technical information on AT&T System 25 (System25). It includes a description of the syst

AUTOMATIC INTERCOMDescriptionAllows a multiline voice terminal user (or attendant) to place and answer calls to and fromanother station by use of a de

●Call Pickup: When an Automatic Intercom call is picked up via Call Pickup, theAUTO ICOM status LED on the called voice terminal lights steadily. Th

AUTOMATIC ROUTE SELECTION (ARS)DescriptionProvides for the routing of calls over the telecommunications network based on preferredroutes (normally the

—FNPA calls made to numbers specified in the FNPA Exception List.—All other FNPA calls.ARS Flow ChartFigure 2-8 provides a simplified ARS flow chart.

V1 Systems Only: For calls outside the HNPA (FNPA calls), a check is made against anon-administrable Special Numbers List. The numbers in the list in

STATION USERDIALS ARSACCESS CODE[401]NUMBER DIALEDON EMERGENCYNUMBERS LIST(911, ANDTHREE CUSTOMERNODEFINED 7-DIGITNUMBERSNO[601-603]IVOICE TERMINALS“R

FROMSHEET 1NUMBER DIALEDWITHIN HOMENPA?SYSTEM [30] YESNOAREA CODE ON YESNPA ROUTINGTABLE [300]NUMBER DIALEDON HOME NPAEXCEPTIONLISTS[500]V1 ONLY: NUM

The following tones are associated with ARS:●Confirmation–Indicates that a queued call is being serviced (trunk available to routecall )●Busy—Indicate

● Direct Facility Access Button: Multiline voice terminal users who have pressedFACILITY to activate the busy-to-idle reminder must wait until all qu

—Subpattern A Start and End Time (Hour: Minute)—Subpattern A and B–Route 1, 2, and 3 Facility Access Codes (1-9999) or, inV2, Virtual Facility Codes (

System 25 DescriptionSystem 25 (Figure l-l) is an advanced digital switching system that integrates voice anddata communications. It not only provide

ROUTINGPATTERNS(1-8)[100]NO[ 200]ROUTING SUBPATTERNS (RSP) A AND BRSP A ROUTE 1ROUTE 2 ROUTE 3START/STOPTIME[101],[102]POOLEDFACILITYACCESSCODE[110]PO

BUSY-TO-IDLE REMINDERDescriptionEnables a multiline voice terminal user to be alerted by a single ring as soon as a busyinternal station, DGC group, o

CALL ACCOUNTABILITYDescriptionAllows system users to charge outside calls made from other users’ stations to their ownPDCs.To charge a call to his or

CALL ACCOUNTINGCall Accounting is the collecting, processing, and use of information about all trunk callsplaced from and received by System 25. It is

.Data Records: The system prints call records for incoming and outgoing (external)data calls. Calls are considered data calls if they involve a data

number of voice terminals will reflect the total call duration. The maximum timethat can be reported is 95 hours, 59 minutes, and 59 seconds.. Blank (

Interactions. Account Code Entry: Allows users to have an account code or project numberassociated with each call record.. Direct Group Calling (DGC)

DescriptionCAS Model 100:The CAS 100, when connected to a serial printer and the System 25 SMDR port, calculatesthe cost of calls made to outside numb

The CAS performs three main functions; (l) call record processing, (2) report generation, and(3) CAS system management.In addition, a limited director

The following table summarizes CAS station and account code capacities.AT&T CALL ACCOUNTING SYSTEMSCAS Model StationsAccount Codes200 100 50003001

DIGITAL SWITCHEMERGENCYTRANSFER-48V DCUNITUNITSINGLE-LINEANALOGVOICE TERMINALS MULTILINEVOICEHYBRIDTERMINALS DIRECT TRUNK ATTENDANTCONSOLE ORHYBRIDASY

CCCDCCCDDCCCCCCCCCDCCCCCDATE10/08/8510/08/8510/08/8510/08/8510/08/8510/08/8510/08/8510/08/8510/08/8510/08/8510/08/8510/08/8510/08/8510/08/8510/08/8510

ASCII CHARACTERPOSITION(Column Number)010203-040506-070809-101112-131415-161718-35363738-394041-424344-454647-515253-5657-5859-737475-787980DESCRIPTIO

ASCII CHARACTERPOSITION0001-0304-0708-1213-1617-2324-293031-3637-3839-4142-4849-5152-5455-5758-6263-6970-7677-798081DESCRIPTION(top of form)SpaceDATES

SYSTEM 25PART OFCABINETOCTOPUSCABLE— — —PART OFZTN82SIPSMDR OUTPUT— ——OR ZTN128C2Z21OAC1.355A/AFDEVICE/CALLCALLADAPT .ACCOUNTINGPROCESSOR— ——SYSTEM— —

SYSTEM 25PART OFCABINETOCTOPUSCABLEPART OFZTN82SIPOR ZTN128C2Z210AC1355AFC3Z3A4C1CALLPROCESSORADAPT.ADAPT.ADUSMDR OUTPUTC4DEVICEZ3A1C1OR CALLOR Z3A4W1

SYSTEM 25CABINETPART OFZTN82OR ZTN128CALLPROCESSOR(PORT X)TN726TDMDATABUSLINETN726DATALINEPART OFOCTOPUSCABLE———SIPC2Z210AC1355AFZ3A4 .ADAPT. ADAPT.AD

SYSTEM 25PART OFCABINETOCTOPUSCABLEPART OF———ZTN82SIP———OR ZTN128C2.>Z21OACALLADAPT.CO OR PRIVATELINE CIRCUITCONNECT VIA TAEPROCESSOR———C1C3———TYPI

SYSTEM 25CABINETZTN82OR ZTN128CALLPROCESSORTN758POOLEDMODEM———TDMTN726DATALINEBUS2012D 248BTN742ANALOGLINECOTRUNKFACILITYPART OFOCTOPUSCABLEPART OF———

CALL COVERAGE—GROUPDescriptionAllows calls to covered stations to be redirected to a group of covering stations.A total of 32 standard Call Coverage G

Calls sent to coverage will continue to ring at single-line sender terminals but will ceaseringing at multiline sender terminals.In the latter case, t