With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cgspLinkTransmittedSIBs
Cisco GSP Link Transmitted SI Bs
1.3.6.1.4.1.9.9.336.1.6.1.1.66
The number of status indicator 'busy' link status signal units transmitted on this link. The SIB indicates that level two is congested at the transmitting Signalling point.
Back to CISCO-ITP-GSP-MIB MIB page.
IPHost Network monitor allows you to monitor cgspLinkTransmittedSIBs 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.