With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
gsmBcRlpT1AckTimeouts
gsm Bc Rlp T1 Ack Timeouts
This attribute counts the total number of T1 timer time-outs. Retransmission of all unacknowledged frames is started after T1 timer expiry. The counter wraps when it exceeds the maximum value.
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IPHost Network monitor allows you to monitor gsmBcRlpT1AckTimeouts 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.