– 272 – NWA-008845-001 Rev.5.0
32ch1005.fm
PLO
The PLO (Phase Locked Oscillator) equipped on the MP card is responsible to synchronize the system to
the digital network clock.
When the PBX is a clock receiver office, the PLO generates the clock signals according to the source clock
received from the source office within the network. The source clock signals are extracted at DTI 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 arrive from either route 0 or
route 1 due to a transmission 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 route 0 and route 1.
Figure below shows an example of clock supply route when the system is a receiver office.
Clock Supply Route
NOTE: DTI0 and DTI1 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
DTI1
DTI0DTI
DTI
PLO
PLO
: DIRECTION OF CLOCK
SIGNAL SUPPLY
TDSW
NOTE
JULY/01/2006
DIRECT DIGITAL INTERFACE
PLO
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