User's Manual

NDA-24300 CHAPTER 5
Page 327
Issue 1
FAULT REPAIR PROCEDURES
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 COT (C.O. Trunk) to be tested and station line.
• The trunk route must be assigned for Loop Start.
(2) 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:
• If the TLT is a 4-wire E & M System, connect the related leads as shown below:
ATTENTION
Contents
Static Sensitive
Handling
Precautions Required
LC
A
LC
B
LC
C
COT
LC
A
TLT
LC
B
TLT
TLT
R
TLT
R
T
T
TLT
R R
T
T
M
M
E
E
R R
T
T
Receive
Send
TLT
Receive
Send