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Clock Signal Synchronization Test
This test checks to see if the PLO keeps synchronizing with the external clock signals, when the external
clock signals from network have input again after they have stopped once. Do the following steps using
"In Service" transmission lines.
(1)
When providing one clock supply route
STEP1: On the DTI0/PRT0/BRT0 card extracting clock signals, set the switches as follows to stop the
external clock signal input.
• 30DTI0/30PRT0 card: SW-1 and SW-2 to OFF
• 24DTI0/24PRT0 card: SW0-1 and SW0-2 to OFF
• BRT0 card: SW0-2 and SW0-3 to OFF
• 2BRT0 card: SW11-2 and SW11-3 to OFF
• 4BRT0 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 trunk.
STEP3: After an outgoing connection via trunk 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 the DTI0/PRT0/BRT0 card, restore the switches as the state before testing to input the ex-
ternal clock signals.
• 30DTI0/30PRT0 card: SW-1 to ON, SW-2 to OFF
• 24DTI0/24PRT0 card: SW0-1 to ON, SW0-2 to OFF
• BRT0 card: SW0-2 to ON, SW0-3 to ON
• 2BRT0 card: SW11-2 to ON, SW11-3 to ON
• 4BRT0 card: SW4-1 to ON, SW4-2 to OFF, SW4-3 to OFF, SW4-4 to OFF and SW4-5 to ON
– The CLK lamp on the MP card lights.
STEP5: Originate an outgoing call via trunks.
STEP6: After an outgoing connection via trunks has been established, confirm interoffice synchroniza-
tion and speech quality with the procedure shown in STEP 3.
NOTE:
If noise periodically occurs, replace the MP card after checking the switch settings on the MP
card, and do the above test again.
CHAPTER 5 OPERATION TEST
– 325 –
PLO OPERATION TEST
NWA-008852-001 Rev.5.0
98ch5001.fm
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