Tadiran Telecom Coral IPx 500, Installation Manual

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10-16
Coral IPx 500 Installation Manual
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A total of six slots are factory set to accept digital trunk cards to operate in slave clock
mode. Two slots are located in the Coral IPx 500M main cage, two slots are located in
the Coral IPx 500X first expansion cage and the additional two slots are pre-wired in
the Coral IPx 500X second expansion cage.
Two slots in each cage of the Coral IPx 500 system are factory set to accept digital
trunk cards to operate in slave clock mode:
„
Card slot # 4 in both the main and the expansion cage is wired to operate as the
primary external clock synchronization source (marked PRM SYNC).
„
Card slot # 5 in both the main and the expansion cage is wired as the secondary
external clock synchronization source (marked SEC SYNC).
Figure 10-3
identifies the synchronization slots, both in the main cage and in the
expansion cages.
Synchronization Slot Selection
Any combination of primary and secondary synchronization sources, either in the
main or in the expansion cage is valid.
The hardware selection between the main cage and the expansion cages
synchronization slots is determined by jumper settings on the MSBipx (main cage) and
in the MSPipx (expansion cages).
In addition, a software selection must take place. The system must be notified, via the
PI facility, of the synchronization cards shelf/slot location. See
page 10-19, Choosing the
Best Synchronization Source
.
Conditions for Slave Clock Mode Operation
The following conditions are necessary for the Coral IPx 500 to retrieve external clock
signals:
„
The digital trunk synchronization cards must be installed in the synchronization
slots.
„
The PI parameters must be properly set.
System Switch from Slave Clock Mode to Master Clock Mode
When a digital trunk card is initialized in the appropriate slot, the jumper settings on
the MSBipx (Main Service Board of the main cage IPx 500M) and on the MSPipx (Main
Service Board of the expansion cage IPx 500X) are properly set and the Shelf/Slot
combination has been entered as a primary external clock source, the system
2 Synchronization Slots in the Main and Expansion Cages