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Basic Troubleshooting and Repair
Type V
Type V is used in applications where short distance direct back-to-back
operation is desired. The M-lead invert is required at both ends.
Figure 27: E&M Trunk - Type V (4-wire)
Table 53: E&M Trunk Summary
Signal E&M Trunk PBX Outgoing
E&M Trunk PBX
Incoming
Seize M lead goes active (voltage is
dependent on Type I or Type
V operation)
E lead goes active
Seize
Acknowledgment
Immediate Dial - E Lead stays
idle. Outgoing Wink - E Lead
toggles active/idle. Delay Dial
- E Lead goes active following
M; goes idle when ready to go
Immediate Dial - M Lead
stays idle. Incoming Wink -
M Lead toggles active/idle
Digits M toggles (Rotary) or DTMF
through audio path
E toggles (Rotary) or
DTMF through audio path
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