AT&T MERLIN LEGEND Release 3.1 System Programming Manual page 427

Lines and Trunks
Clock Synchronization
Use this procedure to specify the primary, secondary, and tertiary clock source.
A clock source may be a 100D module or a port on an 800 NI-BRI module. See
Feature Reference for more information about the appropriate setting. If the
clock is taken from a 100D module, you can also specify whether the clock is
synchronized to the external endpoint (loop) or to the clock reference source
(local).
NOTE:
This procedure is necessary only if your system includes an 800 NI-BRI module
or more than one 100D module.
Summary: Clock Synchronization
Programmable by
Mode
Idle Condition
Planning Form
Factory Setting
Valid Entries
Inspect
Copy Option
Console Procedure
PC Procedure
System manager
All
Not required
Form 3b, Incoming Trunks: DS1 Connectivity
100D module
Form 3i, Incoming Trunks: BRI Options
Primary clock: the first 100D module in the control unit
carrier;
Primary, Secondary, Tertiary, Loop/Local
No
No
More
Dial port no. OR Select source of
synchronization
Dial port no. OR Select source of synchronization
OR Select source of synchronization
no. OR Select source of synchronization
Type slot no. Type port no. OR Select source of
synchronization
port no. OR Select source of synchronization
Dial slot no.
dial slot no.
Type slot no.
Type slot no.
Programming Procedures
Dial slot no.
Dial port no.
Type port
Type
4–55