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CHAPTER 5 Operation Procedure for System with PIR
Note: When performing loop-back connection tests on the trunks at the user’s office, provide cross connection
as follows:
(1) For a COT
• Set up a loop-back connection between the C.O. Trunk (COT) to be tested and station line.
• The trunk route must be assigned for Loop Start.
(2) For a MC-MG (COT)
• Set up a loop-back connection between the C.O. Trunk (COT) to be tested and station line.
• The trunk route must be assigned for Loop Start.
(3) For a TLT (for DID)
• Set up a loop-back connection between the TIE Line Trunk (TLT) to be tested and another TLT.
• If the TLT is a Direct Inward Dialing (DID) Trunk, connect the related leads as shown below:
LC
A
LC
B
LC
C
COT
LC
A
LC
B
MC-MG (COT)
IP Station
LC
A
TLT
LC
B
TLT
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