365
NT5K21 XMFC/MFE card
Contents This section contains information on the following topics:
"Introduction" (page 365)
"MFC signaling" (page 365)
"MFE signaling" (page 367)
"Sender and receiver mode" (page 368)
"Physical specifications" (page 370)
IntroductionThe 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 betweentwo
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.
Youcan 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.
Signaling levels
MFC signaling uses pairs of frequencies to represent digits, and is divided
into two levels:
•Level 1: used when a call is first established and may be used to send
the dialed digits.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright© 2003-2008, Nor tel Networks
.