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data path Glossary
Administration for Network Connectivity
CID: 77730 555-233-504 — Issue 1 — April 2000
472
data path
The end-to-end connection used for a data communications link. A data path is
the combination of all elements of an interprocessor communication in a DCS.
data port
A point of access to a computer that uses trunks or lines for transmitting or
receiving data.
data service unit (DSU)
A device that transmits digital data on transmission facilities.
data terminal equipment (DTE)
Equipment consisting of the endpoints in a connection over a data circuit. In a
connection between a data terminal and host, the terminal, the host, and their
associated modems or data modules make up the DTE.
DCE
Data-communications equipment.
D-channel backup
Type of backup used with Non-Facility Associated Signaling (NFAS). A
primary D-channel provides signaling for an NFAS D-channel group (two or
more PRI facilities). A second D-channel, on a separate PRI facility of the
NFAS D-channel group, is designated as backup for the D-channel. Failure of
the primary D-channel causes automatic transfer of call-control signaling to the
backup D-channel. The backup becomes the primary D-channel. When the
failed channel returns to service, it becomes the backup D-channel.
DCIU
Data communications interface unit.
DCP
Digital Communications Protocol.
DCS
Distributed Communications System.
dial-plan table
A data structure that defines how a switch or server (such as MMCX) interprets
dialed digits and routes calls. The dial-plan table performs two tasks. First, it
identifies a dial plan rule that applies to the kind of input it has received. Then it
applies the rule and translates the dialed input into a corresponding extension or
public-network telephone number. (MMCX interserver calls are handled
differently; see interserver routing table.)