NEC Univerge SV8100 Features And Specifications Manual page 445

UNIVERGE SV8100
If there are multiple PRIs and the one being used for the source goes down, the system begins to count
forward in slot numbers looking for the next available PRI. In this example, the PRI in 02 went down, so
the system now begins looking forward in slot numbers for the next PRI to use as the clock source.
In this example, the PRI in 05 was the first to synchronize with the carrier and became the PLO
synchronization source. The PRI in 05 then went down and the system began looking forward in slot
numbers to find the next PLO source. In this case, the PRI in 02 was the next source because after it
looks through the rest of the slots in the system, it starts over with 01.
In this example, there are multiple T1 circuits in the system. There can only be one T1 circuit assigned
as EXTERNAL in the system, so the T1 assigned as EXTERNAL is the PLO synchronization source.
Digital Trunk Clocking
Figure 2-5 Digital Trunk Clocking Example 2
Figure 2-6 Digital Trunk Clocking Example 3
Figure 2-7 Digital Trunk Clocking Example 4
Issue 8.01
2 - 417