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CHAPTER 5 OPERATION TEST
PLO Operation Test
NEAX2000 IVS
2
ISDN System Manual
ND-70919 (E), Issue 1.0
Page 195
PLO OPERATION TEST
To confirm the PLO operation do the following tests:
• Clock Signal Generation Test
• Clock Signal Synchronization Test To be tested when the PBX is a clock receiver office.
• Interoffice Synchronization Test
• Source Office Mode Test To be tested when the PBX is a clock source office.
Clock Signal Generation Test
This test checks to see if the PLO keeps generating clock signals at the frequency of the previous
source clock, when the source clock signal from network have stopped. Do the following
procedure using “In Service” transmission lines.
STEP 1: On all the DTI/PRT/BRT cards mounted in PIM0, set the switches as follows to stop
the external clock signal input:
• 30DTI card: SW-1 and SW-2 to OFF
• PRT/24DTI 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
– The CLK lamp on the MP card goes out.
STEP 2: Originate an outgoing call via trunks.
STEP 3: After an outgoing connection via trunks has been established, confirm interoffice
synchronization 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 station in the opposite office.
• Do the above test again in the opposite direction.
STEP 4: 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.