Provides four ISDN BRI U-Interfaces BRI ports can be independently configured to emulate or terminate ISDN circuits from an ISDN switch Compliant with Lucent 5ESS, Nortel DMS100 and National ISDN Emulates Net-3 Euro-ISDN protocol Any BRI port can serve as timing source for systemDistance limitaion: 18,000 feet at 26-gauage
