NetPerformer Hardware Installation Guide
3-24 Memotec Inc.
3.7 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. See Table 4-11
.
• The R and T pair carry voice/fax analog signals between the SDM-9XXX Series
unit 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-9XXX Series unit
to the PBX.
• The R1 and T1 pair carry voice/fax analog signals from the PBX E&M tie trunk to
the SDM-9XXX Series unit.
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 3-25. 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
leads of the analog voice port straight through, without crossing.
E&M Signaling Type Pin No. Connect to PBX Lead
I, V
7E
2M
8 SG (common ground)
II
7E
8SG
2M
1SB
Table 3-2 E&M Wiring
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