T1 used for WANs, fast for standard, nothing compared to the LAN transmission cabling, even the slowest excceds it at 10MBPS.
ok, well here's some specs;
T1 at 1.544KBPS (total, as mentioned)
24 channels at 64KBPS,
you can either have dedicated bandwidth or fractional;
either 1.544KBPS or 24 phone lines.
a certain amount of channels used for phone lines and a certain amount for cable. e.g. maybe 5 phone lines and the rest used for connection 64KBPS x (24 (total channels) - 5 (already used for phones) = 19 (remaining for connection))