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MCITP MCSE : Security Specialist Integrated Services Digital Network (ISDN) Integrated Services Digital Network (ISDN) is an international communications standard for sending voice, video, and data over digital telephone lines and standard telephone wires. ISDN has the ability to simultaneously deliver two connections over a single pair of telephone lines. The two connections may be in any combination of data, voice, video, or fax. The single line uses an ISDN subscriber service, which is called Basic Rate Interface (BRI). BRI has two channels, called B channels, at 64 Kbps each, which carry the data, and one data channel at 16 Kbps for control information. The two B channels can be combined to form a single 128 Kbps connection.   The other ISDN transmission rate service, Primary Rate Interface (PRI), has 23 B channels and one 64 Kbps D channel and uses more wire pairs. PRI is much more expensive to run than BRI and is not commonly selected by individual remote access users. In most cases, BRI is preferred when using ISDN for remote access.   Digital Transmission ISDN is a digital transmission, as opposed to the analog transmission of PSTN. ISDN lines must be used at both the server and remote site. In addition, you must install an ISDN modem in both the server and the remote client.   Extends over Local Telephone Exchange ISDN is not simply a point-to-point connection as a leased line. ISDN networks extend from the local telephone exchange to the remote user and include all of the telecommunications and switching equipment lying between them.   ISDN Modem Dial-up remote access equipment consists of an ISDN modem each for the remote access client and the remote access server. ISDN offers much faster communication than PSTN, communicating at speeds of 64 Kbps or faster.