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20-6 List of terms
customer premise equipment
All telecom equipment located at a customer's premises (except pay
phones).
D1
primary D-channel
D2
secondary D-channel
DAL
See dedicated access line.
DAP
data access point; see network control system
DBA
database administrator
D-channel
A channel that carries call control mesages between a terminal on an ISDN
interface and the exchange termination node. Call control messages are used
to set up, maintain, or clear a circuit-switched call on a B-channel. The
D-channel also carries low-speed packet data between a terminal on an
ISDN interface and a terminal in the packet data network.
DCH
D-channel handler
DDD
See direct distance dialing.
dedicated access line
A trunk interface that connects a PBX, a key system, or a single telephone to
a DMS-250 switch.
Dialable Wideband Service
Multi-rate ISDN switched service aimed at satisfying end-user needs for
flexible, wideband connectivity in the public-switched telephone network.
DIGMAN
digit manipulation
digital recorded announcement machine
A peripheral module developed for the DMS-250 switch. Voice messages
are stored in digital form to provide access to up to 30 different service voice
announcements.
297-2521-106 Standard 23.01 March 2001
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