CHAPTER 5 OPERATION TEST
PLO Operation Test
NEAX2000 IVS2 ISDN System Manual
ND-70919 (E), Issue 1.0 Page 195
PLO OPERATION TESTTo 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 c lock 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 directi on.
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.