The only non-LAN interface on an 827 is
the ADSL interface, which supports
ADSL speeds: Downstream speed range: 32
to 8032 kbps. Upstream speed range: 32
to 864 kbps.
If you are not looking for a DSL termination,
but instead want a T1 serial link, then
you should consider the 1600 or 1700 as
a start.