Lucent Technologies MERLIN LEGEND Release 6.0 System Planning Manual page 118

MERLIN LEGEND Communications System Release 6.0
System Planning 555-660-112
3 Lines/Trunks
Selecting Line/Trunk Options
Under Priority in the Clock Synchronization section, do one of the following:
9. If assigning backup synchronization:
a.
b.
correctly functioning digital PSTN facilities. Therefore, the system
deriving its clock from the tandem trunk will be assigned loop. If no
digital PSTN trunks exist for either reason and PRI tandem trunks
exist, the hub system for a star network configuration should provide
the clock source. The DS1 PRI lines should be specified as local at
the hub and loop at the non-hub switches. For a linear network
configuration or a combination linear and star network configuration
with no PSTN facilities, or PSTN facilities only at a single switch, all
systems not connected to the PSTN facilities and not acting as a hub
and connected by PRI tandem trunks will be set to loop for clock
synchronization sources using the tandem trunks. In the absence of
any external digital facilities, there can be only one active local clock
in the private network.
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.
Issue 1
February 1998
Page 3-27