AT&T MERLIN LEGEND Key System Planning page 96

Lines
Direct-Line Consoles
See the Direct-Line Consoles Operator's
Guides for more on DLCs.
Figure 3-5 Digital/ISDN (MLX) DLC
3-42
Line Assignment
Use these instructions only if the system has one or more direct-line
consoles.
The line buttons automatically assigned to DLCs are different from those on
other telephones. In typical systems, DLC operators are responsible for
handling all incoming calls. Therefore, the factory setting for DLCs is that, in
addition to a Intercom Voice and a Intercom Ring button, as many lines as
possible are assigned to each console. Each line appears on a separate button,
which means that the number of lines assigned is limited to the number of
buttons on the console (up to a maximum of 32 on the 34-button analog DLC).
The system also assigns a Direct Station Selector (DSS) button for each
extension number associated with a station and special-feature buttons that are
used by the DLC operator for call handling.
The number of line, DSS, and feature buttons assigned depends on the type of
telephone and the number of lines connected to the system.
Figures 3-5 and 3-6 show initial line and feature assignments for digital/ISDN
(MLX) and analog DLC consoles. See the appropriate figure as you decide line
assignments for DLCs.