Network Zone ISP - Integrated Services Digital Network (ISDN) is a set of communication standards for simultaneous digital transmission of voice, video, data, and other network services over the traditional circuits of
Motorola 650 ISDN Modem in Box with Power Supply and Cable | RecycledGoods.com
GWS Parts - ISDN NT-1 Siemens modem for MAN Lithoman
Dial Configuration Guide, Cisco IOS Release 15M&T - Configuring Modem Use over ISDN BRI [Support] - Cisco Systems
Definition of ISDN router | PCMag
Cisco 836 ADSL Over Isdn Broadband Router Modem 8Mbps Good Condition Ok | eBay