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D channel (delta channel) is a telecommunications term which refers to the ISDN channel in which the control and signalling information is carried. [1]The bit rate of the D channel of a basic rate interface is 16 kbit/s, whereas it amounts to 64 kbit/s on a primary rate interface.
Each B-channel carries data, voice, and other services. The D-channel carries control and signaling information. Larger connections are possible using PRI pairing. A dual T1-PRI could have 24 + 23 = 47 B-channels and 1 D-channel (often called "47B + D"), but more commonly has 46 B-channels and 2 D-channels thus providing a backup signaling channel.
D-channel backup allows for a second D channel in case the primary fails. NFAS is commonly used on a Digital Signal 3 (DS3/T3). PRI-ISDN is popular throughout the world, especially for connecting private branch exchanges to the public switched telephone network (PSTN).
The solution is D channel backup where a second D channel is configured on another trunk. In the event of failure the backup D channel takes over the signaling. So the final configuration is 478B + D + D-backup. NFAS is a cost-cutting measure. Customers ordering a Primary Rate ISDN service will be charged for each signaling channel. Therefore ...
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Basic Rate Interface (BRI, 2B+D, 2B1D) or Basic Rate Access is an Integrated Services Digital Network (ISDN) configuration intended primarily for use in subscriber lines similar to those that have long been used for voice-grade telephone service. As such, an ISDN BRI connection can use the existing telephone infrastructure at a business.
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This is a list of broadcast television stations serving Washington, D.C. in the District of Columbia, the Capital Beltway, and Northern Virginia (see also: List of television stations in Virginia, List of television stations in Maryland).