With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
c3gRxMainGainControl
Cisco 3G Rx Main Gain Control
1.3.6.1.4.1.9.9.661.1.2.6.3.1.8
Received main gain control for the modem. value of '-1' indicates the received main gain control is unavailable.
Back to CISCO-WAN-3G-MIB MIB page.
IPHost Network monitor allows you to monitor c3gRxMainGainControl on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.