With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
timeServerXntpVersion
time Server Xntp Version
1.3.6.1.4.1.3646.1300.2.1.2.1.3.13.1.1
This attribute indicates the version of XNTP currently in use by the network time server.
Back to Nortel-Magellan-Passport-TimeMIB MIB page.
IPHost Network monitor allows you to monitor timeServerXntpVersion 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.