Page 362 of 894 NT5K21 XMFC/MFE card

XMFC sender and receiver specifications

Table 138 and Table 139 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 138

XMFC sender specifications

Forward frequencies in DOD mode: Backward frequencies in DOD mode: Frequency tolerance:

Power level at each frequency:

Level difference between frequencies: Harmonic Distortion and Intermodulation Time interval between start of 2 tones: Time interval between stop of 2 tones:

1380, 1500, 1620, 1740, 1860, 1980 Hz 1140, 1020, 900, 780, 660, 540 Hz

+/- 0.5 Hz from nominal Selectable: 1 of 16 levels < 0.5 dB

37 dB below level of 1 signaling frequency

125usec.

125usec.

Table 139

XMFC receiver specifications (Part 1 of 2)

Input sensitivity:

 

accepted:

-5 to -31.5 dBmONew CCITT spec.

rejected:

-38.5 dBmOBlue Book

Bandwidth twist:

 

accepted:

fc +/- 10 Hz

rejected:

fc +/- 60 Hz

Amplitude twist:

 

accepted:

difference of 5 dB between adjacent frequencies

 

difference of 7 dB between non-adjacent frequencies

Norwegian requirement

difference of 12 dB (for unloaded CO trunks)

rejected:

difference of 20 dB between any two frequencies

Operating time:

< 32 msec.

Release time:

< 32 msec.

 

 

553-3001-211 Standard 2.00 September 2004

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