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Network+ Training Guide by Mike Harwood, Drew Bird

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D
D (delta) channel

The channel used on ISDN to communicate signaling and other related information. Use of the D channel leaves the B channels free for data communication.

See also [B channel]
D-shell connector

A connectors that is shaped like a letter D and uses pins and sockets to establish connections between peripheral devices, using serial or parallel ports. The number that follows DB in the name of a D connector is the number of pins used for connectivity; for example, a DB-9 connector has 9 pins and a DB-25 connector has 25 pins.

daemon

A service or process that runs on a Unix or Linux server.

DAS (dual attached station)

A device on an FDDI network that is connected to both rings. Compare with SAS.

DAT (digital audio tape)

A tape recording ...

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