The fastest you can get on Qbus is the DSV11. That can almost handle 1Mb/s (it fails when fed a constant stream of minimal length HDLC frames so it was rated at 256kb/s - the next lower useful speed). On BI you have either the DMB32 (64kb/s max) or the DSB32. I forget how fast the DSB32 can go, it might be able to reach 256kb/s (possibly only on a single port though) but I'm pretty sure it won't do T1 speeds. The DSB32 is also not an option if you have a VAX 7000 (although I think the DMB32 will work in a VAX 7000). I suspect that for T1 speeds you'll be stuck using an Alpha or possibly a DECnis, but you'll have to check that they will cope before you (or your T1 benefactor) rush out and buy either of those solutions. Antonio -- --------------- Antonio Carlini arcarlini(a)iee.org