With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cSdslSturCurrSnrMgn
Cisco Sdsl Stur Curr Snr Mgn
1.3.6.1.4.1.9.9.155.1.3.1.7
This object specifies the SNR margin as seen by this STU-R with respect to its received signal.
Back to CISCO-SDSL-LINE-MIB MIB page.
IPHost Network monitor allows you to monitor cSdslSturCurrSnrMgn on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.