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PLO OPERATION TEST
To confirm the PLO operation, do the following tests.
• Clock Signal Generation Test
• Clock Signal Synchronization Test
• Interoffice Synchronization Test
Clock Signal Generation Test
This test checks to see if the PLO keeps generating clock signals at the frequency of the last source clock,
when the source clock signals from network have stopped. Do the following steps using "In Service" trans-
mission lines.
STEP1: On all the DTI/PRT/BRT cards mounted in PIM0, set the switches as follows to stop the external
clock signal input.
• 30DTI/30PRT card: SW-1 and SW-2 to OFF
• 24DTI/24PRT card: SW0-1 and SW0-2 to OFF
• BRT card: SW0-2 and SW0-3 to OFF
• 2BRT card: SW11-2 and SW11-3 to OFF
• 4BRT card: SW4-1, SW4-2, SW4-3 and SW4-4 to OFF
– The CLK lamp on the MP card goes out.
STEP2: Originate an outgoing call via trunks.
STEP3: After an outgoing connection via trunks has been established, confirm interoffice synchroniza-
tion and speech quality as follows:
• On the DTMF telephone set, keep pressing any dial button.
• Check to see if noise periodically occurs on the DTMF signals coming from the calling sta-
tion in the opposite office.
• Do the above test again in the opposite direction.
STEP4: On all the DTI/PRT/BRT cards mounted in PIM0, restore the switches as the state before testing
to input the external clock signals.
– The CLK lamp on the MP card lights.
NOTE:
If noise periodically occurs, replace the MP card after checking the switch settings on the MP
card, and do the above test again.
To be tested when the PBX is a clock receiver office.
– 324 –
CHAPTER 5 OPERATION TEST
PLO OPERATION TEST
NWA-008852-001 Rev.5.0
98ch5001.fm
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