NEC SL2100 - Page 260

Feature Examples
Digital Trunk Clocking Examples:
If PRI and BRI exist, the system synchronizes with PRI. In this example, the PRI in slot01 was the first
priority to synchronize with the carrier; therefore, it is the PLO synchronization source.
082U+1PRIDB (PRI)
082U+2BRIDB (BRI)
Main Chassis
Figure 1-9 Digital Trunk Clocking Example 1
If multiple BRIs exist and becomes no PRI exists, the system chooses the first BRI that synchronized
with the carrier. In this example, the BRI in slot02 synchronized with the carrier first and became the
PLO synchronization source.
082U+1PRIDB (PRI)
082U+2BRIDB (BRI)
Main Chassis
Figure 1-10 Digital Trunk Clocking Example 2
In this scenario, the PRI was the clocking source until it went down. There are no other BRIs in the
system. The CPU now becomes the PLO synchronization source.
082U+1PRIDB (PRI)
CPU
Main Chassis
Figure 1-11 Digital Trunk Clocking Example 3
Guide to Feature Programming
Refer to ISDN Compatibility on page 1-534.
Operation
Refer to the related features for details.
SL2100
ISSUE 1.0
1-246
Digital Trunk Clocking
D