AT&T MERLIN LEGEND Release 4.0 Feature Reference page 449

Top Sys Prog
Figure 37. System Programming Console Overlay
Direct Station Selector
One or two Direct Station Selectors (DSSs) can be used with the MLX-20L
telephone. Each DSS adds 50 buttons to the system programming console. For
more information about the DSS, see "Direct Station Selector."
The LEDs on the DSS indicate the status of telephone features during system
programming, such as calling restrictions. Each LED on the DSS represents a
telephone connected to the system. When certain features are selected from the
System Programming menu, the LEDs on the DSS indicate the status of the
feature for each telephone. For example, if
Extension menu, the red LED is on for each extension that is toll-restricted.
Programming with SPM on a PC
The advantages of programming the system with a PC are the availability of
surrogate mode and, in releases prior to Release 3.0 (where programming can
be backed up on a PCMCIA memory card), the security that comes from
knowing that programming can be backed up on a floppy or hard disk. This
makes recovery of system programming fast and efficient in the event of an
inadvertent system shutdown or loss of power.
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Switchhook
Stop/Drop Entry
Pause
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Programming
449