With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cSdslStucInvSerialNumber
Cisco Sdsl Stuc Inv Serial Number
1.3.6.1.4.1.9.9.155.1.2.1.1
This object specifies the vendor specific string that identifies the vendor STU-C.
Back to CISCO-SDSL-LINE-MIB MIB page.
IPHost Network monitor allows you to monitor cSdslStucInvSerialNumber on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.