i have to know the speed of the various serial interface for all speed and connection that use with cisco product
We call T1/E1 interface as "T1, E1, and G.703 Multiflex Trunk Voice and WAN Interface Cards"
WIC1T/2T support upto 2Mbps on each port.
With NM,It depends which NM module you are using with the WAN interface card on it. Please see the diff NM's and the WAN cards you can put in the NM slots.