With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
gsmBcV42bisCompRatioDecoder
gsm Bc V42bis Comp Ratio Decoder
This attribute indicates the number of uncompressed bytes divided by the number of compressed bytes. A value greater than one means that the data is being compressed. This is the compression ratio achieved by the V.42bis encoder at the mobile or Public Switched Telephone Network (PSTN). This attribute is relevant for both protocol modes transparent and compressed as the encoder switches between the two modes.
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IPHost Network monitor allows you to monitor gsmBcV42bisCompRatioDecoder 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.