Nortel Networks Circuit Card 311 - Manual (Page 845)

MF signaling 845
Digit
Backward direction
DOD-Tx, DID-Rx
9 1100 Hz + 1500 Hz
0 1300 Hz + 1500 Hz
KP 1100 Hz + 1700 Hz
ST 1500 Hz + 1700 Hz
STP(ST’) 900 Hz + 1700 Hz
ST2P(ST") 1300 Hz + 1700 Hz
ST3P(ST") 700 Hz + 1700 Hz
XMFR receiver specifications
Table 334 "XMFR receiver specifications" (page 845) provides the operating
requirements for the NTAG26 circuit card.
Table 334
XMFR receiver specifications
Coding: Mu-Law
Input sensitivity: must accept: 0 to -25 dBmO
must reject: -35 to dBmO
Frequency sensitivity: must accept: f +/- (1.5% + 5Hz)
Amplitude Twist: must accept: difference of 6dB between frequencies
Signal Duration: must accept: > 30 ms
must reject: < 10 ms
KP Signal Duration: must accept: > 55 ms
may accept: > 30 ms
must reject: < 10 ms
Signal Interruption Bridge: must ignore: < 10 ms
Time Shift between 2 frequencies:
(Envelop for start/stop)
must accept: < 4 ms
Coincidence between 2 frequencies: must reject: < 10 ms
Intersignal Pause: must accept: > 25 ms
Maximum Dialling Speed: must accept: 10 signals per second
Noise Rejection:
Error Rate in White Noise
Better than: < 1/2500 calls
Test:
10 digit calls
nominal frequency @ -23 dBmO
ON/OFF = 50 ms/50ms
KP duration 100 ms
SNR = -20 dB
all digits
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
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.