Yeah, 128kbps speeds. That crap cost too much, for very little performance. It is very old school stuff. Hardly anyone even messes with anymore. Here.
"Internet Access. ISDN provides high-speed, cost-effective digital access to the internet. At 128Kbps, a Basic Rate Interface (BRI) ISDN line is eight times faster than a 14.4Kbps modem, less expensive to use, and easier to maintain. And a Primary Rate Interface (PRI) provides even greater capacity. "
http://www01.sbc.com/Products_Services/Business/ProdInfo_1/1,,26--4-1-0,00.html?submit.y=8&submit.x=11
Too much...too little.