Nortel Networks 1000 User Manual
Page 739
739
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NTAG26 XMFR card
Contents
This section contains information on the following topics:
“Physical specifications” (page 742)
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 295 "MF frequency values" (page 739)
lists the frequency values
used for received signals.
Table 295
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
02.06
Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.