Filter
Top Products
NEAX2000 IVS
2
ISDN System Manual
Page 196 ND-70919 (E), Issue 1.0
CHAPTER 5 OPERATION TEST
PLO Operation Test
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 has input again after it has stopped once. Do the following
procedure using “In Service” transmission lines.
(1) When providing one clock supply route
STEP 1: On the DTI0/PRT0/BRT0 card extracting clock signals, set the switches as follows to
stop the external clock signal input:
• 30DTI0 card: SW-1 and SW-2 to OFF
• PRT0/24DTI0 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
– The CLK lamp on the MP card goes out.
STEP 2: Originate an outgoing call via trunk.
STEP 3: After an outgoing connection via trunk 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 the DTI0/PRT0/BRT0 card, restore the switches as the state before testing to input
the external clock signals:
• 30DTI0 card: SW-1 to ON, SW-2 to OFF
• PRT0/24DTI0 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
– The CLK lamp on the MP card lights.
STEP 5: Originate an outgoing call via trunks.