With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
frMuxFramerFrmToIf
Frame Relay Mux Framer Frm To If
1.3.6.1.4.1.1570.1.2.13.1.1
The number of frames transmitted to the link interface by Framer. Note: This does not include the number of frames transmitted directly to the hardware queue, thus bypassing the Framer component.
Back to Nortel-Magellan-Passport-FrameRelayMuxMIB MIB page.
IPHost Network monitor allows you to monitor frMuxFramerFrmToIf on Allied Telesis device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Nortel multiplexers right now.