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DEFINITY Enterprise Communications Server Release 6
Maintenance for R6vs/si
555-230-127
Issue 1
August 1997
Maintenance Object Repair Procedures
Page 10-1215SYNC (Synchronization)
10
Figure 10-88. Example Stratum 3 Synchronization Configuration
For Stratum 3 synchronization, an external clock provides a timing signal to a
TN780 Tone-Clock circuit pack, and the TN780 provides timing to all circuit
packs in the port network in which the TN780 resides (that is, the PPN in the
previous diagram). The PPN Expansion Interface circuit pack uses the timing
generated by the TN780 to generate a data stream which is sent across the two
Expansion Interface Links to the two EPNs to the EPN Expansion Interface circuit
packs. The EPN Expansion Interface circuit packs use the received data stream
to generate a timing signal which is used by the Tone-Clock circuit packs in the
EPNs to provide timing for all circuit packs in both EPNs. (The Tone-Clock circuit
pack is not necessarily a TN780; only the Tone-Clock circuit pack connected to
the external Stratum 3 clock must be a TN780.) The PPN, in the above mentioned
scenario, is designated the
master
port network and the EPNs are called
slave
TN780
TONE/CLOCK
PPN
EPN
EPN
EXTERNAL
STRATUM 3
CLOCK
DS1 REFERENCES
TIMING
INFO
EI LINK
EXPANSION INTERFACE (EI) LINK*
* EPN-TO-EPN LINKS ARE NOT USED TO CARRY TIMING
TIMING
INFO
EI LINK