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CHAPTER 5 Operation Procedure for System with PIR
• If the TLT is a Direct Inward Dialing (DID) Trunk, connect the related leads as shown below:
• If the TLT is a 4-wire E & M System, connect the related leads as shown below:
• If the TLT is a 2W E & M System, connect the related leads as shown below:
(4) For a DTI
• Set up a loop-back connection between the DTI Trunk to be tested and another DTI Trunk as shown
below:
• If the office is the PLO-source office, perform the tests by disconnecting the PLO and M-OSC. The
mode of the PLO becomes Self Operation Mode.
• When the loop-back test is performed at the time of PCM LOSS, FRM LOSS, or MERM LOSS alarm
lamp (red) illuminates. If the alarm lamp goes out, the DTI circuit card side is normal.
• When only one DTI circuit card is to be checked, make the following connections and confirm that no
alarm lamps illuminates.
TLT
R
TLT
R
T
T
TLT
R R
T
T
M
M
E
E
R R
T
T
Receive
Send
TLT
Receive
Send
TLT
R
TLT
R
T
T
M M
E
E
LC
A
DTI
LC
B
DTI
DTI
R R
R
R
T
T
T
T
Receive
Send
DTI
Receive
Send
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