Hardware Installation
Memotec Inc.
4-21
4.9 E&M Wiring and Grounding
In a two-wire E&M application, connect wires 4 and 5 to the PBX R and T pair,
respectively. Refer to
• The R and T pair carry voice/fax analog signals between the SDM-9220/9230
and the PBX.
In a four-wire E&M application, connect wires 4 and 5 to the PBX R and T pair, and wires
3 and 6 to the PBX R1 and T1 pair, respectively.
• The R and T pair carry voice/fax analog signals from the SDM-9220/9230 to the
PBX.
• The R1 and T1 pair carry voice/fax analog signals from the PBX E&M tie trunk
to the SDM-9220/9230.
Connect the signaling wires as indicated in the following table:
When PBX-to-PBX E&M tie trunks are installed, the E lead of one PBX is normally
crossed over and connected to the M lead of the other PBX, and vice versa. See the first
connection scenario in
“Four-wire E&M Connections” on page 4-22
. In a multiplexing
application the crossover is accomplished digitally. Therefore, when connecting an analog
PBX to the E&M interface card,
the E and M leads of the PBX connect to the E and M
E&M Signaling Type
Pin No.
Connect to PBX Lead
I, V
7
E
2
M
8
SG (common ground)
II
7
E
8
SG
2
M
1
SB
Table 4-2: E&M wiring
Summary of Contents for NetPerformer SDM-9220 Series
Page 1: ...NetPerformer SDM 9220 SDM 9230 Hardware Installation Guide ...
Page 8: ...Memotec Inc ...
Page 12: ...Memotec Inc ...
Page 13: ...1 Memotec Inc 1 1 Preface ...
Page 24: ...SDM 9220 9230 Hardware Installation Guide 1 12 Memotec Inc ...
Page 25: ...2 Memotec Inc 2 1 Compliance Information ...
Page 39: ...Compliance Information Memotec Inc 2 15 2 3 3 Compliance to China RoHS ...
Page 41: ...3 Memotec Inc 3 1 Unpacking ...
Page 47: ...4 Memotec Inc 4 1 Hardware Installation ...
Page 80: ...SDM 9220 9230 Hardware Installation Guide 4 34 Memotec Inc ...
Page 81: ...5 Memotec Inc 5 1 Product Description ...
Page 113: ...6 Memotec Inc 6 1 Serial Port and User Equipment Connections ...
Page 122: ...SDM 9220 9230 Hardware Installation Guide 6 10 Memotec Inc ...
Page 123: ...7 Memotec Inc 7 1 Networking Features ...
Page 127: ...8 Memotec Inc 8 1 Troubleshooting Tips ...