Xmfc sender and receiver specifications – Nortel Networks 1000 User Manual

Page 363

Sender and receiver mode

363

XMFC sender and receiver specifications

Table 151 "XMFC sender specifications" (page 363)

and

Table 152 "XMFC

receiver specifications" (page 363)

provide the operating requirements for

the NT5K21 XMFC/MFE card. These specifications conform to CCITT R2
recommendations: Q.441, Q.442, Q.451, Q.454, and Q.455.

Table 151
XMFC sender specifications

Forward frequencies in DOD mode:

1380, 1500, 1620, 1740, 1860, 1980 Hz

Backward frequencies in DOD mode:

1140, 1020, 900, 780, 660, 540 Hz

Frequency tolerance:

+/- 0.5 Hz from nominal

Power level at each frequency:

Selectable: 1 of 16 levels

Level difference between frequencies:

< 0.5 dB

Harmonic Distortion and Intermodulation

37 dB below level of 1 signaling frequency

Time interval between start of 2 tones:

125 usec.

Time interval between stop of 2 tones:

125 usec.

Table 152
XMFC receiver specifications

Input sensitivity:

accepted:
rejected:

-5 to -31.5 dBmONew CCITT spec.
-38.5 dBmOBlue Book

Bandwidth twist:

accepted:
rejected:

fc +/- 10 Hz
fc +/- 60 Hz

Amplitude twist:

accepted:

difference of 5 dB between adjacent frequencies
difference of 7 dB between non-adjacent frequencies

Norwegian requirement
rejected:

difference of 12 dB (for unloaded CO trunks)
difference of 20 dB between any two frequencies

Operating time:

< 32 msec.

Release time:

< 32 msec.

Tone Interrupt no release:

< 8 msec. Receiver on, while tone missing

Longest Input tone ignored:

< 8 msec. Combination of valid frequencies

Noise rejection:

S/N > 18 dB No degradation, in band white noise
S/N > 13 dB Out-of-band disturbances for CCITT

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311

02.06

Standard

27 August 2008