[c-nsp] SNMP Question

[Scott Voll]

I'm trying to monitor my PRI utilization with Cacti.

I have found that for my 3845 (running 15.0) with PRI in slots 0/0/0 I can
use OID 1.3.6.1.4.1.9.10.19.1.1.9.1.3.0.0

But I'm having trouble finding PRI's in slots 0/1/0 and 0/1/1.  How do you
normally go about finding the OID that you want to monitor?  Sorry if this
is a Newb question.  I've tried using MIB Viewers without success.

TIA

Scott