Nortel Networks Circuit Card - Manual (Page 695)

Page 695 of 906
Circuit Card Description and Installation
700
NTAG26 XMFR card
Contents
This section contains information on the following topics:
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 695
MF signaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 695
Physical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 700
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.