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Page 404 of 544 NT5K21 XMFC/MFE card
553-3011-100 Standard 14.00 January 2002
Receive mode
When in receive mode, the XMFC/MFE card is linked to the trunk card by a
PCM speech path over the Meridian network cards. MFC signals coming in
over the trunks are relayed to the XMFC/MFE card as though they were
speech. The XMFC/MFC card interprets each tone pair and sends the
information to the CPU through the CPU bus.
Send mode
When in send mode, the CPU sends data to the XMFC/MFE card through the
CPU bus. The CPU tells the XMFC/MFE card which tone pairs to send and
the XMFC/MFE card generates the required tones and sends them to the trunk
over the PCM network speech path. The trunk transmits the tones to the far
end.
XMFC sender and receiver specifications
Tables 125 and Table 126provide 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 125
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.