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Option11C and 11C Mini TechnicalReference Guide
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Chapter 22 — NT5K21 XMFC/MFE card
Contents
This section contains information on the following topics:
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 399
MFC signaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 399
Signaling levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400
Forward and backward signals . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400
MFE signaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 402
Sender and receiver m ode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 403
XMFC sender and rec eiver specifications . . . . . . . . . . . . . . . . . . . . . . . 404
XMFE sender and rece iver specifications . . . . . . . . . . . . . . . . . . . . . . . 406
Physical specificatio ns . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 407
Overview
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 CO 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.

MFC signaling

The MFC feature allows the Opti on 11C system to use the CCITT MFC R2
or L1 signaling protocols.