Lucent Technologies MERLIN LEGEND Release 6.0 System Planning Manual page 124

MERLIN LEGEND Communications System Release 6.0
System Planning 555-660-112
3 Lines/Trunks
Selecting Line/Trunk Options
8. If the system includes both 800 NI-BRI and 100D modules, clock synchro-
nization 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.
If the switch is part of a private network, clock synchronization needs to be
coordinated for the entire network. Refer to the clock synchronization
information in the Installation Specification forms provided by the Network
Engineering Group.
Plan your clock source administration to minimize the need for clock
switching, which is known to cause noise on active calls.
Under Priority, in the Clock Synchronization section, do one of the
following:
9. If assigning backup synchronization:
a.
b.
10. Under the Source subheading in each box, do one of the following:
If installing only one 100D module:
— To keep the factory setting, check Primary (that is, this
module provides synchronization for the system).
— If the synchronization source is other than through the 100D
module, check None.
If installing more than one 100D module, decide which module, if
any, provides the primary synchronization:
— If Module 1 provides clock synchronization, check Primary in
the first box (the factory setting).
— If Module 2 (or Module 3) provides clock synchronization,
check Primary in the box that describes that 100D module.
— If the synchronization source is other than through a 100D
module, check None.
In the box that describes the 100D module providing secondary
synchronization, check Secondary.
In the box that describes the 100D module providing tertiary back
up, check Tertiary.
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.
Issue 1
February 1998
Page 3-33