Specifications

Personal Security Data Book | 113
7. REALTIME ABSENT/PRESENT INDICATION
Application: HOSPITAL
System: LBB 6000. with Multi-purpose coupler
MPC
Problem: To provide real-time onscreen indication
of the pager status i.e absent/present.
Requirement: Modification to charging racks.
Solution
Every pager holder in a system is assigned a dedicated slot
within a charging rack. Each slot within the rack is
connected via the input (on/off) contacts (max. 31
inputs) of a multi-purpose coupler(s) LBB 5843.
The alphadesk is coupled to the multipurpose couplers
using its RS485 capability. Using a special software
module, the ‘absent/present’status in the ‘Autocall’ table is
updated in real-time every time a pager is placed in or
taken out of the charging-rack.
8. OPERATIONAL SURVEILLANCE OF TRANSMITTER
AND PAGING LINES IN A MULTI-TRANSMITTER
SYSTEM.
Application: HOSPITAL
System: LBB 6000.
Problem: To provide operational surveillance of a
large DP 6000 system.
Requirement: To frequently monitor the operational
activity of transmitters and paging lines
in a multitransmitter system.A back-up
PC should take over all monitor and
control functions should the main
alphadesk PC malfunction.
Solution
All system components are connected via the relays of a
PCL 725 card.For transmitter and paging line
surveillance, each transmitter within the multi-
transmitter system is connected to a storage rack with an
assigned receiver. Using a special software module, scan
calls are made from the alphadesk at regular intervals to
the receivers housed in the storage racks for transmitter
monitoring. The scan calls test the integrity of the lines
from the transmitter to the DP 6000 bus,as well as testing
their RF radiation. If an error occurs in the system which
keeps the paging line occupied,the alphadesk will scan
each encoder (including itself), transmitter and charging
rack in the system, by opening and closing its relevant
relay contacts on the PCL 725 relay card. Using this
procedure the offending piece of equipment will be
located, and disconnected. Should the alphadesk itself
malfunction a back-up PC will take over all control and
monitoring functions.
Paging Transmitter
VHF or UHF
Charging racks
Each charging slot
dedicated to an
assigned pager
Multi-purpose
Coupler (MPC)
DP6000 bus
LBB 6000
Single
Storage Rack
Single
Storage Rack
Single
Storage Rack
Alphadesk
No.1 No.2 No.3
LBB 6000
Paging
Transmitter
VHF or UHF
Telephone
Coupler
Network
Paging
Transmitter
VHF or UHF
Paging
Transmitter
VHF or UHF
PCL 725
Relay card
Alphadesk
LBB 6000
PCL 725
Relay card