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D-16
Service Conditions (cont'd)
b.) Sub-Master Office: This office operates using a Phase Lock Oscillator (PLO) to
synchronize with the clock at the Master Office. If the Master Clock has some failure,
office can operate using its own backup oscillator.
c.) Slave Office: This office is arranged so it will have at least two clock routes, one for
Master and the other for standby. Synchronization Clock is derived from incoming PCM
bit stream from higher hierarchy offices.
d.) Local Slave Office: This is the end office in a digital network arrangement. This office will
not be provided with a backup route for the PLO, because this office is the only one
influenced in an event of trouble occurrence.
6.
Each NEAX2400 ICS can be equipped with a duplicate Phase Lock Oscillator used for network
synchronization. Each PLO has 4 inputs to which clocks from the Master Oscillator or Digital
Interface Module should be connected.
Page 212
Direct Digital Interface
S
SS
R
LR
Network Clocking Hierarchy
S:
Source Office
SS: Sub-Source Office
R:
Receiver Office
LR: Local Receiver Office
Direction of Clock
SS
R
LR
NEAX2400 ICS Business Features and Specifications
LR
NDA-24143, Issue 4
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