Nortel Networks Circuit Card 311 - Manual (Page 844)

844 NTAG26 XMFR card
Physical specifications
The physical specifications required by the NTAG26 XMFR circuit card are
shown in
Table 332 "Physical specifications" (page 844) .
Introduction
Table 332
Physical specifications
Dimensions Height:12.5 in. (320 mm)
Depth:10.0 in. (255 mm)
Thickness:7/8 in. (22.25 mm)
Faceplate LED Lit when the circuit card is disabled
Power requirements 1.1 Amps typical
Environmental considerations Meets the environment of CS 1000E, CS 1000M, and
Meridian 1 systems
The XMFR (Extended Multi-frequency receiver) card is used to receive MF
digit information. Connections are made between a PBX and a CO. The
XMFR card can only operate in systems using µ-law companding.
MF signaling
The MF feature allows the Option 11C system to receive digits for 911 or
feature group D applications.
Signaling levels
MF signaling uses pairs of frequencies to represent digits.
The following table lists the frequency values used for received signals.
Table 333
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
4 700 Hz + 1300 Hz
5 900 Hz + 1300 Hz
6 1100 Hz + 1300 Hz
7 700 Hz + 1500 Hz
8 900 Hz +1500 Hz
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
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