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DIRECT DIGITAL INTERFACE (DDI)
PLO
– 197 –
A2195-10
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 ex-
tracted 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 the source and sub-source office, due to a transmission line failure, the PLO
keeps generating the clock signals at the frequency of the previous source clock. The PLO can
receive different frequency of source clocks from the 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:
DTI 0 and DTI 1 must be mounted in PIM0.
PLO
TDSW
SOURCE OFFICE
~
SOURCE
CLOCK
RECEIVER/LOCAL-RECEIVER OFFICE
PBX
DTI
DTI
TDSW
RECEIVER OFFICE
DTI
DTI
DTI
TDSW
SUB-SOURCE OFFICE
PLO
DTI
DTI 1
DTI 0
DTI
DTI
PLO
PLO
: DIRECTION OF CLOCK
SIGNAL SUPPLY
TDSW
NOTE
Содержание NEAX 2000
Страница 1: ...ND 70916 E ISSUE 1 Feature Programming Manual JANUARY 2000 NEC Corporation ...
Страница 95: ...BROKER S CALL 75 A2066 10 BROKER S CALL PROGRAMMING Refer to CALL HOLD and CALL HOLD Dterm page 95 ...
Страница 102: ...CALL BACK MULTIPLE ASSIGNMENT 82 A2076 10 CALL BACK MULTIPLE ASSIGNMENT PROGRAMMING Refer to CALL BACK page 80 ...
Страница 157: ...CALL QUEUING 137 A2131 10 CALL QUEUING PROGRAMMING Refer to CALL WAITING DISPLAY page 142 ...
Страница 272: ...EXECUTIVE RIGHT OF WAY EXECUTIVE RIGHT OF WAY Dterm 252 A2247 10 HARDWARE REQUIRED Dterm and DLC card if required ...
Страница 273: ...FAULT MESSAGE 253 A2247 10 FAULT MESSAGE PROGRAMMING Refer to Maintenance Manual ...
Страница 402: ...PEG COUNT 382 A2382 10 PEG COUNT PROGRAMMING Refer to the CMB0 B3 of the Command Manual ...
Страница 443: ...SELF DIAGNOSIS 423 A2412 10 SELF DIAGNOSIS PROGRAMMING Refer to the Maintenance Manual ...
Страница 496: ...STATION LINE STATUS DISPLAY 476 A2463 10 STATION LINE STATUS DISPLAY PROGRAMMING Refer to Maintenance Manual ...
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Страница 757: ...ND 91285 001 E ISSUE 1 Model 100MX BUSINESS FEATURES AND SPECIFICATIONS DECEMBER 1999 NEC Corporation ...
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