AT&T MERLIN LEGEND Communications System Key System Planning Forms Errata Instruction Manual download pdf (Page 111)

MERLIN LEGEND Communications System Release 5.0

System Planning

555-650-112

Issue 1

June 1997

Lines/Trunks

Page 3-29Selecting Line/Trunk Options

8. If assigning backup synchronization:

a. In the box that describes the 100D module providing secondary

synchronization, check Secondary.

b. In the box that describes the 100D module providing tertiary back

up, check Tertiary.

9. Under the Source subheading in each box, do

one

of the following:

■ To retain the factory setting (that is, the system uses the clock of the

far-end connection), check Loop.

■ To change the setting (the clock is free-running), check Local.

10. The typical setup for the primary synchronization source is Active, and

other modules are set to Not Active. Under the Activation subheading in

each box, do

one

of the following:

■ If loop clock synchronization is taking place, check Active (factory

setting).

■ If the clock is free-running, check Not Active.

11. Under the Channel Service Unit heading, check Foreign Exchange.

PRI Options 3

After you have completed the module information on pages 1 and 2 of Form 3b,

Incoming Trunks: DS1 Connectivity (100D Module), use the instructions in this

section to record PRI options:

■ Assigning B-channels to groups

■ Associating outgoing and incoming services to the groups

■ For groups with incoming services, selecting an incoming routing method

(Dial Plan Routing or Line Appearance) and providing routing information

■ For groups with outgoing services, completing the Network Selection,

Special Services, and Call-by-Call Service tables

■ Identifying the trunk and telephone numbers sent to the network for caller

identification

■ Assigning a test number used for maintenance by the service provider,

changing timers and counters from the defaults, and assigning the

Terminal Equipment Identifier (TEI)

All channels assigned to a group must be on the same 100D module. Also, the

order of the B-channel groups is not important. However, the order in which

channels are assigned within a group should be the exact opposite of the order in

which the telephone company’s switch hunts through for a channel. Consult with

the service provider to determine what the correct order should be.

When programmed for PRI, the single DS1 jack on the 100D module supports 23

B-channels (the Channel 24 superframe transmits signaling mode information).

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