SX-50 E+M Trunk Setup
The following notes apply to interfacing an SX-50 with a Motorola Vanguard 320 VoIP Gateway, but may be adapted for other E&M trunk applications.
This example assumes the Universal card is in slot 10,
Command 573 & 575 - Trunks 73 & 75
Command 153 - Trunk Group 3
E&M Module DIP settings:
Universal Card - Tip and Ring Assignments
Idle: E lead = -48v / M lead = 0v
Seized: E lead = 0v / M lead = -48v
Verify far-end circuits by activating near-end M lead and listening for
far-end dial tone.
Verify near-end circuits by activating near-end E lead and listening for near-end dial tone.
Connecting to Vanguard:
Connect the two E&M trunks to the two RJ connectors (far left side of each daughter board)
1 - GND
2 - E
3 - R1
4 - T1
5 - R
6 - T
7 - M