Lucent Technologies MERLIN LEGEND Release 7.0 System Planning Manual page 172

MERLIN LEGEND Communications System Release 7.0
System Planning 555-670-112
3 Lines/Trunks
Selecting Line/Trunk Options
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:
Extra BRI DSLs which are not in service should never be programmed as
clock sources.
Planning Form Instructions
Refer to Form 1, System Planning, Control Unit Diagram. Complete the following
information on Form 3i, Incoming Trunks: BRI Options (800 NI-BRI Module),
page 2:
1. To keep the factory setting (the first slot and port found in the system
provides synchronization for the system), or if assigning a different module
to provide primary clock synchronization:
a.
b.
2. If assigning secondary or tertiary backup synchronization:
a.
b.
Timers
Timers ensure that the system takes the appropriate corrective action when the
expected response is not received from the network during normal operation.
Enter the slot and/or DSL number (BRI only) under Primary Clock
Synchronization.
Under the Source subheading, check Loop to indicate that the
system uses the clock of the far-end connection (factory setting) or
"Local" to indicate the clock is free-running (100D modules only).
NOTE:
The only option for an 800 NI-BRI module is loop, which is
automatically assigned and is not programmable.
Enter the slot and DSL number (BRI only) under Secondary Clock
Synchronization and/or Tertiary Clock Synchronization.
Under the Source subheading in each column, check "Loop" to
indicate that the system uses the clock of the far-end connection
(factory setting) or Local to indicate the clock is free-running
(100D modules only).
NOTE:
The only option for an 800 NI-BRI module is loop, which is
automatically assigned and is not administrable.
3
Issue 1
April 1999
3-50
3