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11.1
20/1553-ANF 901 54 Uen F3 2016-03-14
ACCESSORIES
OPTION UNIT
The DBY 420 01 allows connection of an external bell to the telephone. The extra bell
is active in parallel with the ring signals.
For installation of the DBY 420 01 option unit, see installation instructions for TELE-
PHONE SETS DBC 222 01, DBC 223 01, DBC 224 01, DBC225 01, KEY PANEL UNIT
419 01 AND OPTION UNIT DBY 420 01 .
To check or change the function (after mounting of the DBY 420 01 to the DBC
224 terminal):
•
Press ANS/EXT * 1 simultaneously for at least 1 second.
A tone signal is heard, and the display shows:
The current function is indicated by the Clear> key lamp.
Off
On
Flashing
To change the function:
•
Repeatedly press the Clear > key to set the requested function (= Key lamp Off).
To exit:
•
Press # to finish checking
Extra bell (default setting)
Busy signal (cannot be used)
Combined Extra bell & Busy signal (cannot be used)
A
CCESSORIES
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