Carrier Access Access Bank II SNMP - Manual (Page 105)

4-Wire E&M/TO Configuration
11-2 9/24/01
ropolitan area networks. Each of the twelve E&M channels can be individually configurted to support
Signaling Types I, II, IV or V, using up to 4 signaling and transmission pairs per channel (E/M, SG/
SB, T/R, and T1/R1). This card can be configured to function as Channel Equipment (normal multi-
plexer mode) or as Switching Equipment for back-to-back Tandem applications sometimes referred
to as Reverse E&M or Pulse Link Repeater (PLR).
11.2.2 Physical Description
Like the FXS and FXO/DPT voice cards, the 4-wire E&M/TO is a 7.8” by 13.16” daughter card that
slides into the back of the Access Bank II - SNMP (AB2 - SNMP) along rails that guide a 64-pin DIN
connector to mate with a matched connector on the internal ABI Controller. The E&M/TO card
receives T1 signaling, control logic, and -48 Vdc power through this connector from the Controller
card. Because the RJ-21X Amphenol

Telco connector on the ABI front control panel fails to pro-
vide enough wiring leads, it is bypassed through a 96-pin E&M signaling line connector attached on
the opposite end of the card. The E&M signaling lines (E, SG, M, SB, T, R, T1 and R1) are connected
to this high-density 96-pin DIN connector. A bank of 12 channel status LEDs are located next to the
E&M signaling line connector on the ABI back plate. Each channel has jumpers that allow the chan-
nel to be configured for E&M Types I, II, IV and V signaling. Each channel also has a 10-position
DIP switch that allows the receive and transmit attenuation to be individually set from -22 dB to +10
dB. There is also a 4-position DIP switch located next to the processor for setting regular or clear
channel E&M signaling types and selecting busy or idle during carrier failure.
11.3 Typical Applications
The major applications for the 4-wire E&M/TO voice card are E&M Tie Lines operating in either
Normal or Tandem mode. This interface also supports two-way Direct Inward Dial (DID) applica-
tions. See Figure 11-1 and Figure 11-2 below for pictorial representations of these typical applica-
tions.