With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
appnLocTgByteCost
appn Loc Tg Byte Cost
Cost-per-byte is a single byte value in the range 0 to 255 that expresses a relative cost of transmitting a byte over the associated transmission group. The units for cost-per-byte are user-defined. Like cost-per-connect-time, cost-per-byte is network specific and will not be uniform across networks unless assignments are coordinated.
Back to Nortel-Magellan-Passport-AppnMIB MIB page.
IPHost Network monitor allows you to monitor appnLocTgByteCost 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.