Avaya MERLIN MAGIX Maintenance And Troubleshooting Manual page 281

Maintenance and Troubleshooting
DLC
Direct-Line
calls (not directed to an individual or a group) and inside calls, to transfer calls, to
make outside calls for users with outward calling restrictions, to set up conference
calls, and to monitor system operation.
DNIS
Dialed Number Identification
incoming 800 or 900 calls according to customer-selected parameters, such as
area code, state, or time of call.
Door Answering Unit
Device connected to a
desk.
DOS
Disk Operating
Drop-and-Insert Equipment
Device that can be installed between systems connected by
or T1-Emulated
use of fewer than 23 of the PRI
In a PRI facility, the equipment must never drop Channel 24, the D-Channel. All
channels must still be programmed and all count towards the system maximum of
80 lines.
DS0
Digital Signal
DS1
Digital Signal
kbps channels into a single 1.544-mbps stream.
DSL
Digital Subscriber
single twisted metallic pair (2-wire) at a rate sufficient to support ISDN Basic Rate
Access.
DSS
Direct Station
capabilities of a 4424D+, 4424LD+, MLX-20L, or MLX-28D telephone used as an
operator console.
GL-14
Console. Telephone used by a system operator to answer outside
Service. Service provided by AT&T and MCI to route
Tip/Ring jack and used at an unattended extension or front
System.
Tandem Tie Trunks
B-Channels
0. Single 64-kbps voice or data channel.
1. Bit-oriented signaling interface that multiplexes twenty-four 64-
Line. Digital Subscriber Line provides full-duplex service on a
Selector. Fifty-button
to allow fractional use of the facility–that is,
or fewer than 24 of the T1 Channels.
Adjunct that enhances the call-handling
Tandem PRI Trunks