Nortel Networks 1000 - Manual (Page 362)

362 NT5K21 XMFC/MFE card
Table 150
MFE Frequency values
Digit
Forward direction
OG-Tx, IC-Rx Backward direction
1 700 Hz + 900 Hz 1900 Hz
(Control Frequency)
2 700 Hz + 1100 Hz —
3 900 Hz + 1100 Hz —
4 700 Hz + 1300 Hz —
5 900 Hz + 1300 Hz —
6 1100 Hz + 1300 Hz —
7 700 Hz + 1500 Hz —
8 900 Hz + 1500 Hz —
9 1100 Hz + 1500 Hz —
10 1300 Hz + 1500 Hz —
Sender and receiver mode
The XMFC/MFE circuit card provides the interface between the system’s
CPU and the trunk circuit which uses MFC or MFE signaling.
The XMFC/MFE circuit card transmits and receives forward and backward
signals simultaneously on two channels. Each channel is programmed like
a peripheral circuit card unit, with its own sending and receiving timeslots
in the network.
Receive mode
When in receive mode, the XMFC/MFE card is linked to the trunk card
by a PCM speech path over the 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.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 02.06 Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.