AT&T MERLIN LEGEND Communications System Key System Planning Forms Errata Instruction Manual download pdf (Page 124)

MERLIN LEGEND Communications System Release 5.0

System Planning

555-650-112

Issue 1

June 1997

Lines/Trunks

Page 3-42Selecting Line/Trunk Options

NOTES:

1. IOC package “S” is available on the AT&T 5ESS, Northern Telecom

DMS-100, and Siemens SSC EWSD switches.

2. If configured with MLH service, the MLHG feature must be used if the CO

is a Northern Telecom DMS-100 switch. The Series Completion feature

must be used if the CO is an AT&T 5ESS or Siemens SSC EWSD switch.

3. The MERLIN LEGEND system does not support Voice/Data hunt groups

with the Siemens SSC EWSD central office switch.

5. If configured with MLH (using either the MLHG or Series Completion

feature), indicate whether the hunt pattern is linear or circular by placing a

check in the appropriate column under the “Hunt Pattern” heading.

6. Indicate the features available on each BRI line:

■ If CPN/BN is available, place a check in the “CPN/BN” column as

appropriate.

Clock Synchronization 3

If the system includes both 800 NI-BRI and 100D modules, clock synchronization

planning should be completed at the same time. There is only one

primary/secondary/tertiary clock for both 800 NI-BRI modules and 100D modules,

with the same system programming screens used for both types.

Plan your clock source administration to minimize the need for clock switching,

which is known to cause noise on active calls.

The primary, secondary and tertiary clock sources, all three of which should be

administered if possible, should be set in the following order:

1. The loop clock sources on BRI ports with DSLs in service. If at all possible,

all three clock sources should be on the same 800 NI-BRI module.

2. The loop clock source on any 100D module connected to the CO and in

service.

3. The loop clock source on any 100D module in T1 mode operating in a

tie-trunk configuration.

4. The local clock source on any 100D module.

If no administration has been performed, upon Frigid Start (system start-up), the

first 100D or NI-1 BRI port that is in service will be the default primary loop clock

source.

NOTE:NOTE:NOTE:

Extra BRI DSLs which are not in service should never be administered as

clock sources.

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