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Glossary:
Installation and Upgrades for G700 with S8300 or S8700
555-234-100 — Issue 3 — May 2003
327
data path
The end-to-end connection that is used for a data communications link. A data path is the combination of all elements of
an interprocessor communication in a distributed communications system (DCS). See also distributed communications
system (DCS).
data port
A point of access to a computer that uses trunks or lines to transmit or receive data.
data rate
See
bit rate.
data service unit (DSU)
See channel service unit/data service unit (CSU/DSU)
.
data terminal
An input/output (I/O) device that has either switched access or direct access to a host computer or to a processor
interface.
data terminal equipment (DTE)
Equipment that comprises the endpoints in a connection over a data circuit. In a connection between a data terminal and a
host, the terminal, the host, and the associated modems or data modules comprise the DTE.
dBA
Decibels in reference to amperes
dBrnC
Decibels above reference noise with C filter
DCE
See data communications equipment (DCE)
.
D-channel
A data channel over which ISDN messages are transported to control the call setup of one or more B-channels.
D-channel backup
The type of backup that is used with nonfacility 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, that channel becomes the backup D-channel. See also nonfacility-associated signaling (NFAS)
.
DCO
Digital central office
DCP
See Digital Communications Protocol (DCP).
DCS
Distributed communications system
DDC
Direct Department Calling
DDD
See Direct Distance Dialing (DDD)
.
DEFINITY LAN Gateway (DLG)
An application that uses a TCP/IP Ethernet transport instead of the traditional Basic Rate Interface (BRI) transport to
provide the functionality of Adjunct-Switch Application Interface (ASAI).