Specifications

Some conversions take place independent of external
circumstances (permanent conversions), others only in
the case of reception of an absence signal after the call.
Permanent conversions can be used in the case of
breakdown of receivers and absence conversions to
reroute calls to an assistant or colleague.
The coupler can be programmed to block certain ranges
of numbers so as to limit the engaged time as much as
possible if a wrong selection has been made.
It is possible to connect a printer to the coupler, to print
out the contents of the conversion tables.
If use is made of multi-channel operation and/or alarm
contacts,it is quite possible that some calls have to be
transmitted to the same receiver. In this case,the coupler
will transmit calls at such a rate that the user of the
receiver has enough time to respond to the calls.
The coupler’s memory is protected with a back-up
battery to prevent loss during mains failure.
Connection to the telephone system
The actual connection to the telephone system is done via
1 to 4 coupler heads LBB 5841/00.These heads accept
loop disconnect output of the PABX (selector dial
system), with or without ringing current. If the PABX
uses touch tone selection (DTMF), each coupler head has
to be equipped with a touch tone detector LBB 5841/05.
96 | Personal Security Data Book
The same is valid for “meet me”: there is only one “meet
me”channel available.However,speech,“meet me”and
display calls are possible simultaneously, with the
limitation that if a speech call has been made on one
channel,“meet me”and display calls can be transmitted
at a maximum rate of one call per second, so as not to
disturb too much the speech in progress.
The address to be called can be of one to four digits. This
number can be fixed; it can, however, also be made
dependent on the first digit selected. In this case, the call
numbers could consist, for example, of 3 and 4 digits.
This feature is applied in systems,where the receiver call
numbers should be identical to the internal telephone
numbers, which in turn vary in length (e.g. an extended
old PABX).
Depending on the requirements,a digit has to be dialled
after the address digits to determine the call tone. This
digit can also be left out and preprogrammed or made
dependent on the programme selected.
For transmission of internal telephone numbers, up to 11
digits can be selected. Non-required places can be filled
with preprogrammed information.
A selection break-off procedure can be enabled.
Depending on the value of certain digits dialled, the
selection display information can be skipped.
The coupler has a built-in number converter.
The conversions can be programmed via a telephone
extension or via the coupler’s own keyboard.