Nortel Networks Circuit Card 311 - Manual (Page 841)

841
NTAG26 XMFR card
Contents
This section contains information on the following topics:
"Introduction" (page 841)
"MF signaling" (page 841)
"Physical specifications" (page 844)
Introduction
The XMFR (Extended Multi-frequency receiver) card is used to receive MF
digit information. Connections are made between a PBX and a central office.
The XMFR card can only operate in systems using µ-law companding.
You can install this card in any IPE slot.
MF signaling
The MF feature allows the system to receive digits for 911 or feature group
D applications.
Signaling levels
MF signaling uses pairs of frequencies to represent digits.
Table 330 "MF frequency values" (page 841) lists the frequency values used
for received signals.
Table 330
MF frequency values
Digit
Backward direction
DOD-Tx, DID-Rx
1 700 Hz + 900 Hz
2 700 HZ + 1100 Hz
3 900 Hz + 1100 Hz
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
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.