Here are the OIDs used by Cisco 877 modems to get line speed, SNR, attenuation etc…

I mainly use this with software called PRTG

Cisco 877 SNMP OIDS (These work with the latest IOS image  (C870-ADVSECURITYK9-M), Version 12.4(22)T

.1.3.6.1.2.1.10.94.1.1.3.1.8.12 = line speed out
.1.3.6.1.2.1.10.94.1.1.2.1.8.12 = line speed in
.1.3.6.1.2.1.10.94.1.1.3.1.7.12 = output power out
.1.3.6.1.2.1.10.94.1.1.2.1.7.12 = output power in
.1.3.6.1.2.1.10.94.1.1.3.1.5.12 = attenuation down
.1.3.6.1.2.1.10.94.1.1.2.1.5.12 = attenuation up
.1.3.6.1.2.1.10.94.1.1.3.1.4.12 = SNR down
.1.3.6.1.2.1.10.94.1.1.2.1.4.12 = SNR up

 

1.3.6.1.4.1.9.2.1.57.0 = CPU

1.3.6.1.4.1.9­ ­ .9.48.1.1.1.5.1 = Cisco Memory

 

Note: Last OID integer is the interface index number. This value can vary between routers.
To get the right interface number, use the command

show snmp mib ifmib ifindex