CHAPTER 1 GENERAL INFORMATION
– 8 – NWA-008853-001 Rev.3.0
97ch1001.fm
PLO
The Phase Locked Oscillator (PLO) equipped on the MP card is responsible to synchronize the system and
to the clock signals from the another office.
When the PBX is a clock receiver office, the PLO generates the clock signals according to the source
clocks received from the source office within the network.
The source clock signals are extracted at DTI/CCT cards and supplied to the PLO.
Two clock routes are available; one is the route 0 from the source office, and the other is a standby route
1 from a sub-source office. When no clock signals come from either the route 0 or route 1, due to a trans-
mission line failure, the PLO keeps generating the clock signals at the frequency of the last source clock.
The PLO can receive different frequency of source clocks from the route 0 and route 1.
This figure shows an example of clock supply route configuration.
Clock Supply Route
NOTE: DTI0/CCT0 and DTI1/CCT1 must be mounted in PIM0.
PLO
TDSW
SOURCE OFFICE
~
SOURCE
CLOCK
RECEIVER OFFICE
PBX
DTI
DTI
TDSW
RECEIVER OFFICE
DTI
DTI
DTI
TDSW
SUB-SOURCE OFFICE
PLO
DTI
DTI
DTI
TDSW
DTI
DTI
PLO
PLO
: DIRECTION OF CLOCK
SIGNAL SUPPLY
SYSTEM OUTLINE
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