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Defining Extension Number For FT20
At the first moment FT20 is connected to the exchange, the four-digit extension number
appears on the display in the “Telephone no=aaaa” format.
If the data on the LCD display are changing upon lifting and replacing the handset, then
that indicates extension settings are correct. However, if those data are not changing,
then the extension number of FT20 must be set. In order to do that:
1) The message “Telephone number / no= ” appears on the display after the “Park”
key is pressed for a long time and then released.
2) The telephone number is entered according to the numerical values that have
been assigned to the programmable keys. (Those numerical values have been
given in detail in the section “FT20 Start-Up State”.)
3) After the telephone number, which has been entered accordingly is confirmed
through the “Connect” key, FT20 will operate at that defined extension.
NOTE: When number of another extension of the exchange is entered to FT20, the
speech channel is activated; however, the data line does not function in parallel to the
speech path.
Number Of FT20s That Can Be Connected To The Exchange
And Connection Distances:
1) The FT20 telephones can be connected to any extension of the exchange.
2) Number of FT20s that will be connected to the exchange and accessories using
the external data line of the exchange should not exceed 25 in total.
3) If “-48VDC/ ground+ data” signals and the “A / B” wires are carried to FT20 over
separate cables, then an FT20 can be located at most 2 kms. far from the
exchange in the event that ordinary cables are employed.
That distance would decrease as the number of the feature telephone sets that are
connected to the exchange increase. For example, when 10 FT20s are connected
to the exchange as previously explained, the maximum allowed distance between
the telephone sets and the exchange drops to 250 meters.
FT20 Start-Up State
When the telephone set is attached to the system for the first time, user is prompted to
enter her/his extension number through the message “Telephone Number/No= ” on the
display. At that time, the display cursor enables data entry. After the user has entered
her/his telephone number by making use of the programmable keys of the elephone set
and has confirmed it through the “Connect” key, the telephone would get in use
following three short beeps. In case the entered number is not a proper one for the
exchange, the message “Enter a valid number” is displayed and short beep is emitted.
This case would continue until the correct number is entered.
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