With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
xdsl2LInvSerialNumber
xdsl2 L Inv Serial Number
1.3.6.1.4.1.2011.2.25.251.1.3.1.1.5
The xTU serial number (vendor-specific information) as inserted in the Overhead Messages (both xTUs for G.992.3, G.992.4, G.992.5, and G.993.2) or in the Embedded Operations Channel (xTU-R in G.992.1 and G.992.2). It is vendor-specific information consisting of up to 32 ASCII characters.
Back to VDSL2-LINE-MIB MIB page.
IPHost Network monitor allows you to monitor xdsl2LInvSerialNumber on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.
