Nortel Networks 311 사용자 설명서
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
provides the operating
requirements for the NTAG26 circuit card.
Table 334
XMFR receiver specifications
XMFR receiver specifications
Coding:
Mu-Law
Input sensitivity:
must accept: 0 to -25 dBmO
must reject: -35 to 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
must reject: < 10 ms
KP Signal Duration:
must accept: > 55 ms
may accept: > 30 ms
must reject: < 10 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
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
Copyright © 2003-2008, Nortel Networks
.