User guide
Doortel 4
Issue 1.01
Page 9
low volume, changing the volume of the microphone on the DOORTEL 4 may help
.
With a very loud external enviroment the unit may be have difficulties detecting the
busy tone
. This may happen also with tone which are not within the values as indicated
in the technical specification at the end of this document. In this case you should use
always the dial of the digit "3" to terminate the connection.
Please take care that if you need the external power supply the used transformer should
have
an open circuit voltage of no more then 15 Vpp
. We suggest the use of our
transformer PRS 210.
Please note that only
one door opener with 40 Vpp and 2 A
can be connected to the
build in relais of the unit. If you need to drive more door openers or if you need an
higher voltage or current you should use an external relais. We suggest the use of our
relais 1471.
Furthermore please consider this for the installation:
- If you are using digital sets or featurephones on your PABX please take care that these
are enabled to send DTMF tones also after an incoming call. You need this to open the
door.
