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MERLIN LEGENDCommunications System Release 6.1
System Planning
555-661-112
Issue 1
August 1998
Lines/Trunks
Page 3-47Selecting Line/Trunk Options
3
The primary, secondary and tertiary clock sources, all three of which should be
programmed 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 programmed as
clock sources.
Planning Form Instructions 3
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:
■ 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.
2. If assigning secondary or tertiary backup synchronization:
■ 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.