E&M Trunk Module; Brief Description; Facilities; Operation - Mitel SX-200 Practices

Circuit Card Descriptions
E&M Trunk Module
7.7
Brief Description
The E&M Trunk Module plugs into the Universal Card, It provides interface to Type I
E&M trunks.
The module has a power rating of 3. Because of this, a maximum of three of these
modules can be used per Universal Card.
Facilities
\Facilities provided by the E&M Trunk Module include:
l
Type 1 signaling
l
selectable gain/loss plan for normal or satellite working trunks
l
selectable 600 ohm or AT&T Complex Balance Network (350 ohms + 1000 ohms in
parallel with 0.21 mF)
l
selectable 2- or 4-wire transmission
l
on board filter/codec for analog/digital and digital/analog conversions (mlaw).
Operation
The E&M Trunk Module is set for the type of trunk in use by a set of eight DIL switches.
The settings are as follows:
Function Switches
12345676
PABX to Line Gain
3
dB oxxxxxxx
-13 dB lxxxxxxx
Line to PABX Gain
- 4dB xoxxxxxx
-11 dB xlxxxxxx
Balance
600
ohm
Complex
xx1 oxxxx
xx01xxxx
Transmission
Signaling
2-wire
4-wire
Type 1
Me5
xxxxl xxx
xxxxoxxx
xxxxxl xx
xxxxxoxx
0= open, I = closed, x= not applicable
Default setting for North America is 00101100
Trunk Types
The E&M Trunk Module applies signals to the M lead and monitors the E lead. In the
on-hook condition, the Type I interface grounds the M lead; an open presented to the
E lead indicates idle, a grounded E lead indicates an incoming call. In the off-hook
condition, the Type I interface applies -48 volts to the M lead; a ground sent to the E
lead indicates an incoming seizure.
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Revision 0 9109-09&125-NA
Issue 1