Integrated Service Digital Network (ISDN) is amongst the oldest broadband digital access strategies for buyers and enterprises to attach to the web. It's a phone information service standard. Broadband service is often compared with ISDN-BRI because this was the standard broadband access technology that formed a baseline for the issues faced by the early broadband suppliers.

These suppliers attempted to compete against ISDN by offering quicker and less expensive services to customers. A basic rate ISDN line (ISDN-BRI) is a line with two information "bearer" channels (DS0 - 64 kbit/s each).Using ISDN terminal adapters (mistakenly called modems), it's possible to bond two or even more separate ISDN-BRI lines together to reach bandwidths of 256 kbit/s or even more. The ISDN channel bonding technology has been utilized for video meeting applications and broadband info transmission. First rate ISDN, known as ISDN-PRI, is an ISDN line with twenty-three DS0 channels and total bandwidth of 1,544 kbit/s. ISDN E1 (EU standard) is an ISDN line with 30 DS0 channels and total bandwidth of 2,048 kbit / s.

Because ISDN is a telephone-based product, plenty of the language and physical sides of the line are shared by the ISDN-PRI utilized for voice services. An ISDN line can be provisioned for voice or information and many various options, depending on the hardware being used at any specific installation and the offerings of the telephone company's central office switch. Most ISDN-PRI's are utilized for phone voice communication using large PBX systems, instead of information. One clear exception is that ISPs customarily have ISDN-PRI's for handling ISDN information and modem calls.

ISDN is a network technology that supports digital transfer of concurrent voice and information traffic. Like DSL in this respect, an ISDN Internet service works over ordinary phone lines. ISDN service sometimes supports information rates of up to 128 Kbps. The comparatively heavy price of ISDN service limited its popularity in home patrons at the outset. Lately, the way higher network speeds supported by more modern broadband technologies like DSL have drawn many buyers away from ISDN service. Today ISDN technology has limited applications as a networking solution.