Mike's PBX Cookbook

SX-50 E&M 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.

Programing

This example assumes the Universal card is in slot 10,
trunks 73 & 75 will be used, with trunk group 3.

Command 573 & 575 - Trunks 73 & 75

a b c d e f g h i j
1 3 1 3 1 0 1 0 2 1
2 0 0 0 0 1 0 0 1  
3 1 2 0 1 1 2      
4 0 5 1 0 0 1 0 0 1
5 0 0 0 0 0        
6 1 1 2 4 1        
7 0 2 4 3 3 0 2 0  

Command 153 - Trunk Group 3

a b c d e f g h i j k
1 0 0 0 0 7 8        
2 0 0 2 0 0 0 0 0 0 0
3 0 0 0 0 0 1 3      
4 0 0 0 0            
 
  

E&M Module DIP settings:

1 2 3 4 5 6 7 8
               
               

1 - Open: PBX to Line +3dB
     Closed: -13dB

2 - Open: Line to PBX -4dB
     Closed: -11dB

3 - Open: Complex Balance
     Closed: 600 ohm

4 - Open: 600 ohm Balance
     Closed: Complex

5 - Open: 4 wire Operation
     Closed: 2 wire

6 - Open: Type 5 Signaling
     Closed: Type 1

7&8 - Not Used

Universal Card - Tip and Ring Assignments

Module 1

Pin Pair Trunk
26 W-BL Tip 1
1 BL-W Ring 1
27 W-O TR1
2 O-W RR1
28 W-G E1
3 G-W M1

Module 2

Pin Pair Trunk
30 W-S Tip 2
5 S-W Ring 2
31 R-BL TR2
6 BL-R RR2
32 R-O E2
7 O-R M2

Module 3

Pin Pair Trunk
34 R-BR Tip 3
9 BR-R Ring 3
35 R-S TR3
10 S-R RR3
36 BK-BL E3
11 BL-BK M3

Module 4

Pin Pair Trunk
38 BK-G Tip 4
13 G-BK Ring 4
29 BK-BR TR4
14 BR-BK RR4
40 BK-S E4
15 S-BK M4

Testing:

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)

RJ-45

SX-50

1 - GND

PBX GND

2 - E

E

3 - R1

TR1

4 - T1

RR1

5 - R

Tip 1

6 - T

Ring 1

7 - M

M

8 -

 
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