Specifications

the life of the receiver’s batteries by as much as five times
the normal battery life span.
Out of range
The alpha desk server is capable of sending an automatic
warning signal to inform receiver carriers that they have
crossed the limit of the transmitter range.
RS485 connection
The Server has an RS485 interface for the connection of
multi-purpose coupler heads.When the software module
LBB 6501 is installed the LBB 5843/01 coupler heads can
be connected directly to this interface and prepro-
grammed calls with alpha- numeric messages can be
transmitted on the activation of one of the coupler head’s
contact inputs.(For a more detailed description refer to
the datasheet of LBB 6501)
LBB 6001 functions
If DP6000 alphadesk server is equipped with an LBB 6001
(speech and talk-back card) and LBB 6004 (audio unit)
the following additional functions are available when the
Server is loaded with the basic software.
Keyboard calls with speech
If the LBB 6001 is incorporated together with the LBB
6004, keyboard calls may be transmitted with or without
a spoken message.Spoken messages are transmitted from
the microphone of the audio unit LBB 6004. Speech can
be made dependent of the value of the call-tone digit and
if the call is made to the receiver via the name list, speech
will be enabled automatically if the call is targeted to a
speech receiver. A speech-time duration of between 10
and 254 seconds can be programmed.Alternatively an
infinite time can be programmed which can be terminat-
ed by pressing the microphone button on the audio unit.
Talk-back
In systems using transceivers, the operator can initiate a
speech call to a transceiver holder or vice versa.The
transceiver can choose one of two desks to call (in a
multi-desk system) by using the two pilottones on the
transceiver itself. The talk-back audio will be reproduced
by the loudspeaker in the audio unit.
Talk-through
The alpha desk can link a speech call from one transceiver
holder to another. If the operator wishes to join the con-
versation the audio unit may be switched on.
74 | Personal Security Data Book
‘MANUAL CALL’. Depending on the type of receiver
used, calls can be transmitted with numeric or
alphanumeric messages.
If an alphanumeric message is to be sent,the message can
be freely typed-in using the Servers keyboard or a pre-
programmed message can be taken from a list made up of
20 different messages (max.) Such messages can be pro-
grammed in the message list using the user edit menu.
Call conversion
The Server receives the paging calls that are put on the
line by any paging encoder in the system.With this fea-
ture calls with numeric messages can be converted in to
calls with alphanumeric messages.
Both the call-tone digit and the 5-digit numeric message
can be converted into freely programmable alphanumeric
messages. Programming can be such that the fixed
‘call-tone digit’generated by the telephone coupler will
always be converted in to the word “Phone”, and the tele-
phone number following will be transmitted unconvert-
ed.Alternatively numeric messages generated by a multi-
purpose coupler in a process control system can be con-
verted into full alphanumeric messages for display on an
alphanumeric receiver. For example – the digits 22403
could be represented as “Major defect in heater 19”. Such
messages initially require programming.
As well as converting the call-tone digit and the 5-digit
numeric messages into alphanumeric messages, the
addresses of the received paging calls can also be convert-
ed into other preprogrammed addresses.These may be
programmed as permanently converted, or converted
only if the paged receiver is placed in an absence storage
rack.
A maximum of 500 info conversions, 200 Permanent
address conversions and 200 absent conversions may be
programmed.
Time blocked call feature
The software program allows a receiver which is pro-
grammed in the name list, to be placed in a ‘Do not dis-
turb mode’, for a pre-programmed time duration.
The duration from start to finish of the ‘Do not disturb
mode’must be entered. It is also possible to enter a
receiver number to which the call should be converted
while the receiver is in this mode.
Battery saving
Battery saving can be programmed. Using this facility,
receivers are placed in the off position until a call is made.
A preamble signal is automatically transmitted before a
call, switching the targeted receiver on.
Depending on the number of calls, this facility can extend