AT&T MERLIN LEGEND System Reference Manual page 152

Features
See Chapter 5 for a complete hardware
description of telephones that can be
used as DLCs.
See "Direct Station Selector" in this
chapter for detailed information on the
DSS.
Telephone Differences
Digital DLC
Analog DLC
Single-Line Telephones
The following telephones can be used as DLCs:
Analog DLC
BIS-22D
BIS-34
BIS-34D
MERLIN II System Display Console
Digital DLC
MLX-28D
MLX-20L
Each digital DLC can have one or two Direct Station Selector (DSS) adjuncts
attached. The DSS cannot be attached to an analog DLC; however, the MERLIN
II System Display Console provides a built-in DSS.
Inside Auto Dial buttons can also be programmed on DLCs. The system
operator can use these buttons to transfer a call, make an internal call, or
determine whether or not an extension is available.
An MLX-20L assigned as a DLC can also be used for system programming by
connecting it to the first or fifth station jack on the first MLX module and
designating the station jack for system programming.
The Home screen of the MLX-20L and MLX-28D is the same as that of non-
operator telephones.
The built-in DSS field on the MERLIN II System Display Console corresponds to
physical station jacks in the control unit instead of specific extension numbers in
the numbering plan. Therefore, DSS buttons on the MERLIN II System Display
Console cannot be used to monitor the busy status of trunk pools (Hybrid/PBX
only) or, with Group Calling, to monitor the busy status of a calling group.
An analog DLC cannot be used for system programming; however, System
Speed Dial numbers, the system date, and the system time can be programmed
from an analog DLC connected to the first analog station jack only when the
line/trunk and station module with that jack is in slot 01 of the control unit.
A single-line telephone cannot be assigned as a DLC.
Direct-line Console 2-103