NT5K21 XMFC/MFE card Page 361 of 894

Table 137

MFE Frequency values (Part 2 of 2)

 

Forward direction

 

Digit

OG-Tx, IC-Rx

Backward direction

 

 

 

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.

Circuit Card Description and Installation

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Image 361
Nortel Networks 553-3001-211 manual Sender and receiver mode, Receive mode, Send mode