Lights; Ddcs And Pdcs; For Additional Information - AT&T SYSTEM 25 User Manual

Lights

A steady red light identifies the line you are using or the
line you will be using when you lift the handset.
A steady green light indicates that a line or feature is in
use.
A slow flashing green light indicates an incoming call.
A fast winking green light indicates a call on hold. (An
intermittent winking green light indicates a call held
temporarily while being transferred or conference.)

DDCs and PDCs

When your System 25 was installed, Data Dial Codes (DDCs)
were assigned to data terminals and Personal Dial Codes (PDCs)
were assigned to voice terminals. In most cases, your PDC is
your extension number. If a voice terminal is shared, each
person may have been assigned their own "floating" PDC.

For Additional Information

See your System Administrator if you have any questions or
would like additional information about your System 25 features.
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