Tadiran Telecom Coral IPx 500, Руководство по установке

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Peripheral Cards
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10.3
Digital Trunk Synchronization
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The Coral IPx 500 system is capable of operating in either master clock mode or slave
clock mode. The selection between modes is made via the PI software.
How The System Derives The External Clock Signal
The Coral IPx 500 uses digital trunk interface cards to synchronize its internal clock
with the PSTN clock or with another switching system clock. When operating in
slave-clock mode, the data stream transferred on the digital trunk is fed into the
MSBipx (Main Service Board of the main cage IPx 500M), incorporating the external
clock rate into the Coral internal clock.
To allow the clock signal to be fed into the Coral IPx 500 internal clock, the digital
trunk interface cards must be inserted into specific slots within the unit that are
specifically wired to accept those signals.
Two synchronization sources may be defined for a system. One serves as the primary
source, and the other serves as a secondary synchronization signal source.
The following digital trunk cards can retrieve synchronization signals in the Coral IPx
500M and 500X cages: 30Tipx, T1ipx, PRI-23ipx, PRI-30ipx, 4TBRipx and 8TBRipx.
More Coral FlexiCom 300,400,5000,6000 and IPx 800,3000,4000 digital trunk cards (30T,
T1, PRI-23, PRI-30, 4TBR, 8TBR) are available for synchronization purposes through
the Coral IPx 800X Expansion unit.
1 Slave Clock Mode Operation