T1/E1 and T3/E3 - configuration


AM little confused on the terms T1/E1 and T3/E3

As far as I am concerned there are T1/E1 and T3/E3 in ISDN. And there are T1/E1 and T3/E3 in our normal leased line connection (inter office WAN link connection) where we are not using any ISDN service. What is the difference between these two??

=================================================================== Secondly I have seen the configuration commands

Interface controller t1 0/0 Pri-group / channel-group Clock Framing Line code

Interface serial 0/0 :23 Ip addrss

My question is that is that is enough for a T1/E1 configuration. And why in some configurations Pri-group and in some other configurations channel-group is configured. What is the difference between these two?



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