Hi,
I currently have a T1 internet with a cisco 1720 router, and it is working perfectly. I got a spare 2610 cisco router recently and I configured it exactly like the 1720 router just for backup, but it didn't work. I tried to change a different CSU/DSU module but no luck. Could it be a router fault, how can I check? Does it matter what version of the flash the router is running or is there a specific compiled of a flash that won't work for a T1 internet line?
This is name of the flash c2600-is-mz_120-7_T.bin
Thanks for any help.