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PLO
The Phase Locked Oscillator (PLO) equipped on the MP card is responsible to synchronize the system to
ISDN clocks.
The PLO generates the clock signals according to the source clocks received from network. The source
clock signals are extracted at DTI/BRT/PRT cards and supplied to the PLO. Two clock routes are available;
one is the route 0 to receive clock signals from DTI0/BRT0/PRT0, and the other is a standby route 1 (DTI1/
BRT1/PRT1) to receive clock signals when no clock signals appear on the route 0. When no clock signals
come from either route 0 or route 1, 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.
The figure below shows an example of clock supply route.
TDSW
NOTE:
DTI0/BRT0/PRT0 and DTI1/BRT1/PRT1 must be mounted in PIM0.
Clock Supply Route
PBX
NOTE
DTI0/BRT0
/PRT0
DTI1/BRT1
/PRT1
PLO
CHAPTER 1 GENERAL INFORMATION
– 19 –
SYSTEM OUTLINE
ISDN
: CLOCK SIGNAL SUPPLY ROUTE 0
: CLOCK SIGNAL SUPPLY ROUTE 1
NWA-008852-001 Rev.5.0
98ch1001.fm
JULY/01/2006
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