With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
dsx3FarEndLoopbkLineNum
dsx3 Far End Loopbk Line Num
1.3.6.1.4.1.351.110.4.4.1.1.1.1.24
Specify which DS1 or DS3 line in the far-end for the loopback testing. For CESM-T3/E3, only ds3line(30) is valid.
Back to CISCO-MGX82XX-DSX3-MIB MIB page.
IPHost Network monitor allows you to monitor dsx3FarEndLoopbkLineNum on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.