With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cnsT4ClkSrcNetsyncIndex
cns T4 Clk Src Netsync Index
1.3.6.1.4.1.9.9.761.1.1.5.1.1
An index that uniquely represents an entry in this table. This index is assigned arbitrarily by the clock selection process and may not be persistent across reboots.
Back to CISCO-NETSYNC-MIB MIB page.
IPHost Network monitor allows you to monitor cnsT4ClkSrcNetsyncIndex on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.