AT&T MERLIN LEGEND Communications System Key System Planning Forms Errata Instruction Manual download pdf (Page 106)

MERLIN LEGEND Communications System Release 5.0

System Planning

555-650-112

Issue 1

June 1997

Lines/Trunks

Page 3-24Selecting Line/Trunk Options

9. 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.

10. Under the Source subheading in each box, do

one

of the following:

■ To retain the factory setting, check Loop (that is, the system uses

the clock of the far-end connection).

■ To change the setting, check Local (that is, the clock is

free-running).

NOTE:

The MERLIN LEGEND system must be set to Loop if the clock

Source is coming from the network. The Local setting is generated

from the MERLIN LEGEND system and must be used whenever

connecting two MERLIN LEGEND systems or a MERLIN LEGEND

system and a DEFINITY system (Tie trunk). In a Tie trunk

configuration, one system

MUST

have the clock Source set to Local

and the other

MUST

be set to Loop.

11. 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.

NOTE:

Normally, the primary synchronization source is set to Active and

other modules are set to “Not Active.”

12. If incoming ground-start or loop-start trunks are to be emulated, then

record the CSU setting under the Channel Service Unit heading by doing

one

of the following:

a. To retain the factory setting, check Foreign Exchange.

b. To change the factory setting, check Special Access.

To set up T1 channels for T1 Switched 56 service, continue with the next section.

To set up T1 Switched 56 service on T1-Tie trunks, proceed to the section entitled

‘‘

Tie Trunks’’. To set up a 100D module for PRI service, proceed to the section

entitled ‘‘

PRI Service’’.

T1 Switched 56 – Network 3

Use these instructions only if channels on a 100D module are to be programmed

as T1 Switched 56 channels. The instructions provided in the ‘‘

T1 Service’’ section

must be completed first.

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