Document Revision 4C Electra Elite IPK II
2 - 302 Digital Trunk Clocking
If multiple BRIs exist and no PRI or T-1 EXTERNAL exists, the system chooses the first BRI that
synchronized with the carrier. In this example, the BRI in S4 synchronized with the carrier first and
became the PLO synchronization source.
In this scenario, the PRI was the clocking source until it went down. There are no other PRIs, T1
(Externals), or BRIs in the system. The IPK II CPU now becomes the PLO synchronization source.
Figure 2-9 Digital Trunk Clocking Example 7
Figure 2-10 Digital Trunk Clocking Example 8
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