I have 2600 router and have WIC-2T card.
one resonal site is connect s0/0 and internet modem connect so/1 card. For slow of net, I test the serial interface.
inside e0/0 is packet 5/sec .then time loop s0/0 is normal but when I give loop s0/1 with only modem then packet I/0 128Kb.In normal state s0/1 packet transfer 50Kb
I am not clear why packet increase when looped.