AT&T Merlin Legend MLX-20L Operation Manual page 17

Note: As an operator, you may work on both queued call
consoles and direct-line consoles (DLCs). There is an
important difference between these consoles. Because all
QCC calls are sent to the console one at a time, the QCC has
no individual line buttons, only call buttons. Both inside and
outside calls ring on call buttons. Because DLC calls can ring
simultaneously, the DLC has no call buttons, only individual
line buttons.
Illustrations of the QCC (an MLX-20L phone with one DSS)
and headset follow. A list of terms that describe each piece of
equipment follows each illustration. A separate illustration and
description of the DSS is included. The console's buttons are
described later in this chapter.
Procedures for using the QCC (with or without a headset) are
in Chapter 2 and Chapter 4.
Note: You cannot receive or make calls on the QCC when
you are programming the Alarm Clock or your Personal
Directory, or when the QCC is in maintenance or testing mode
or is being used for system programming. However, calls are
redirected to other consoles when your console is in
maintenance or system programming mode.
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