Nortel Networks Circuit Card - Manual (Page 369)

Page 369 of 906
Circuit Card Description and Installation
378
NT5K21 XMFC/MFE card
Contents
This section contains information on the following topics:
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 369
MFC signaling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 369
MFE signaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 372
Sender and receiver mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 373
Physical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376
Introduction
The XMFC/MFE (Extended Multi-frequency Compelled/Multi-frequency
sender-receiver) card is used to set up calls between two trunks. Connections
may be between a PBX and a Central Office or between two PBXs. When
connection has been established, the XMFC/MFE card sends and receives
pairs of frequencies and then drops out of the call.
The XMFC/MFE card can operate in systems using either A-law or µ-law
companding by changing the setting in software.
You can install this card in any IPE slot.
MFC signaling
The MFC feature allows the system to use the CCITT MFC R2 or L1
signaling protocols.