Back in the ISDN days your only other real option was modem in my neck of the woods!
I Remember hooking up my ISDN with a Cisco/ISDN router with all those lights, it lit up like a Christmas tree at night!
First time surfing with ISDN I though "This is fokkin great! look how quick I'm moving around on the net" then proceeded to pitch my modem.
Especially when the B channel lights kicked in
you just knew you were going full boost!