ASCOM telePROTECT 900 Guía del usuario
TD 90227GB
2006-09-18/ Ver. C
System Installation
On Site Paging System
TD 90227GB
2006-09-18/ Ver. C
System Installation
On Site Paging System
Contents
1 Introduction............................................................................................................. 1
1.1 Abbreviations and Glossary ................................................................................ 1
1.2 System Bus ........................................................................................................ 1
1.3 Data Buses ......................................................................................................... 2
1.4 Speech Bus ........................................................................................................ 2
1.5 FL-bus ................................................................................................................ 2
1.6 Wire Type ........................................................................................................... 2
1.7 Wiring Lengths .................................................................................................. 2
1.8 Extended Wiring Lengths ................................................................................... 3
2 Telephone and PBX Connection ............................................................................. 3
3 Transmitters............................................................................................................. 3
3.1 Frequency Locked Transmitters ........................................................................... 5
3.2 Without Modem to Transmitters ........................................................................ 5
3.3 With Modem to Transmitters ............................................................................. 6
4 Receivers .................................................................................................................. 7
5 Antennas.................................................................................................................. 8
5.1 UHF Antennas .................................................................................................... 9
5.2 HF Antennas ...................................................................................................... 9
5.3 Tuning Circuits and Power Divider ...................................................................... 9
5.4 Antenna Location ............................................................................................ 10
5.5 Antenna Cables ............................................................................................... 11
6 Power Supply ........................................................................................................ 11
7 Current Consumption ........................................................................................... 11
8 Addressing............................................................................................................. 12
9 System Check......................................................................................................... 14
10 Combined Systems.............................................................................................. 15
TD 90227GB
2006-09-18/ Ver. C
System Installation
On Site Paging System
1
1 Introduction
The units in the On Site Paging (OSP) system are designed for wall mounting, either
adjacent to each other or individually. The units are housed in two types of cases; die-cast
aluminium for fixed receivers and slave transmitters, and ABS plastic for all other units.
Both types provide protection against dust and mechanical damage but should not be
located in areas subjected to moisture or extreme humidity.
Operating temperature ranges are -25 to +55ºC for radio equipment and 0 to +40ºC for
other modules. If possible, all units should be placed in dry locations with moderate
temperatures to facilitate service. Avoid locations that are subject to strong
electromagnetic fields, vibration, or rapid temperature changes. The procedure for the
installation of each unit is described in the installation guide for the respective unit.
1.1
OSP On Site Paging
PBX Private Branch Exchange
FL Frequency Lock
SP Speech
RI Receiver Interface
Abbreviations and Glossary
1.2 System Bus
The units communicate via serial transmission on the system bus. Adjacent units are
connected with a ready-made modular system bus cable. Twisted-pair cables are used to
connect remote units, such as a Transmitter located near the antenna, a PBX interface
located at the switchboard, a number of charging interfaces, etc.
System bus cable
Twisted-pair cable
If the bus cable is used, no other system bus connections are needed. Twisted-pairs bus
connections are made at screw terminals on the PC-board. The bus network must never
form loops.
Data buses < 3 km
Speech bus < 500 m
• All data buses are polarized.
• Maximum 32 modules to be connected in a bus network.
TD 90227GB
2006-09-18/ Ver. C
System Installation
On Site Paging System
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• The bus network must be open, never a loop.
• Use only twisted-pair wiring for extension of the system bus.
• Maximum length is 3 km for data buses and 500 metres for the speech bus. Distances
exceeding this require modems.
1.3 Data Buses
The A-bus is used for data communication between the modules and the D-bus for
communication between Central Unit and Terminal transmitters. Both the A- and D-buses
carry constant communication. This can be seen on an oscilloscope as a pulse train. The
normal level is 8-10 Vp-p measured from A1 to A2, and D1 to D2. If several units are
connected to the buses or if the lines are long, the level will be lower but must be at least
0.6 Vp-p. The data buses are polarized.
The four data buses (A, B, C, and D) use balanced lines and operate according to EIA
standard RS-485 and CCITT recommendations V.11 and X.27.
• A- and B-buses are identical and are used for connection of interface modules.
• C-bus is used for communication between different installations, i.e. between two or
more Central Units.
• D-bus transmits pagings in transmit format from the Central Unit to one or several
Terminal Transmitters.
1.4 Speech Bus
The SP-bus is a two-way line connecting all modules that handle the speech signal. The
SP-bus is transformer coupled. The signal level during speech is about 2 Vp-p measured
between SP1 and SP2.
1.5 FL-bus
The FL-bus is a one-way speech bus to terminal transmitters. The FL-bus is used in
frequency locked systems. In contrast to the speech bus, the FL-bus is driven by a low
impedance driver. The FL-bus is polarized.
1.6 Wire Type
Only twisted-pair cables are to be used. Suitable types are, for example EKKX 4 x 2 x 0.5 or
EKKX 10 x 2 x 0.5.
1.7 Wiring Lengths
Max total wiring lengths are:
A-bus 3000 m Data communication between modules
B-bus 3000 m Data communication between modules
C-bus 3000 m Data communication between systems
D-bus 3000 m Data communication from central to terminal transmitters
FL-bus 3000 m 1-way SP-bus to terminal transmitters
R-line 1000 m Speech and data between fixed receiver and receiver interface
SP-bus 500 m 2-way speech bus
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2006-09-18/ Ver. C
System Installation
On Site Paging System
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1.8 Extended Wiring Lengths
If max wiring lengths of the data buses A, B, C and D exceed 3000 m, or if there are more
than 32 units on a bus, the data bus signal must be amplified. On private lines the Bus
Converter is used, and on leased lines (or very long private lines) the Data Modem is used.
If max wiring length of the SP-bus and R-line exceeds 500 m respectively 1000 m, the Bus
Amplifier is used for 1-way speech transmission on private lines and the Speech Modem is
used for 2-way transmission on leased lines.
If max wiring length of the FL-bus exceeds 3000 m the Bus Amplifier is used.
Line Equipment
• Bus Converter T938BC2, for A-, B-, C- and D-bus on private lines.
• Data Modem T938D, for A-, B-, C- and D-bus on leased lines and for very long private
lines.
• Bus Amplifier T938BA, for 1-way transmission on private lines.
• Speech Modem T938S, for 2-way speech transmission on leased lines.
2 Telephone and PBX Connection
A telephone set or a PBX can be used as control unit via a PBX Interface module.
The PBX Interface accepts both dialling pulses and DTMF tones and can be connected to
either trunk or extension lines. It communicates with other OSP modules via the A-bus and
the SP-bus if speech is desired.
PBX
Figure 1. Telephone set or PBX can be connected to the PBX Interface.
Note that additional PBX hardware and/or software may be required to use all functions of
the paging system.
3 Transmitters
There are two types of transmitters; Terminal and Slave transmitters. The Terminal
transmitter(s), is controlled by the Central Unit and receives pagings in transmit format on
the D-bus. Slave transmitters are used to increase coverage in installations where coaxial
cable from the driving transmitter can be run without too much difficulty.
The D-bus is electrically identical with the A-bus, i.e. maximum 32 units connected with
twisted-pair wiring with a maximum total length of 3 kilometres. If speech is used, the SP-
bus must be connected to the terminal transmitters. Note that the total length of the SP-
TD 90227GB
2006-09-18/ Ver. C
System Installation
On Site Paging System
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bus without modem must not exceed 500 metres. If the SP-bus is 1-way, the length can be
increased to max 3 km with bus amplifier T938BA.
D-bus 3 km
Terminal
Transmitter
Slave
Driver
Slave
Transmitter
Central
Unit
SP-bus 500 m
Figure 2. Max D- and SP-bus length.
In HF installations a Power Divider is required between every transmitter for driving the
Slave Transmitters, and in UHF systems a Slave Driver is used between the Terminal
Transmitter and the first Slave Transmitter in series. The Slave transmitters have one output
and they can be connected in series or used as line amplifiers. However, in most cases it is
also advisable to connect an antenna to the line amplifier, especially in speech systems
where speech quality depends directly on coverage.
Slave transmitters are connected with coaxial cable RG-8 or RG-213 with a maximum
length of 700 metres. Distances exceeding this require line amplifiers. A separate power
supply feeds the slave, but if the slave is mounted close to other units the power can be
taken from one of them.
D-bus 3 km
Terminal
Transmitter
Slave
Driver
Slave
Transmitter
Central
Unit
SP-bus 500 m
700 m
Slave
Transmitter
700 m
Power
Divider 700 m Power
Divider 700 m
D-bus 3 km
Terminal
Transmitter Slave
Transmitter
Central
Unit
SP-bus 500 m
Slave
Transmitter
HF
UHF
Slave
Transmitter
700 m
Slave
Transmitter
700 m
Figure 3. Max coaxial cable length.
Equipment for Slave Transmitters
• Power Divider MPT-50, with one output used in HF installations.
• Slave Driver U952DR, with two outputs used in UHF installations.
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2006-09-18/ Ver. C
System Installation
On Site Paging System
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Slave Driver U952DR
The Slave Driver has one antenna output and two outputs for driving Slave Transmitters
from an UHF Terminal Transmitter, U952T. It also obtain a proper level at the Slave
Transmitter input. The Slave Driver operates in the 53 - 65 MHz band to reduce coaxial
cable losses.
3.1 Frequency Locked Transmitters
The Reference Module, that contains a highly stable reference tone generator, is placed
near the Central Unit. Each transmitter is fitted with the combined SM/FL (Speech/
Frequency Lock) T952SM/FL module. The SM/FL module uses the reference tone to correct
carrier frequency. A Slave Driver is needed if the Terminal transmitter is to drive Slave
transmitters.
Equipment for frequency locking
• Combined Speech-/ Frequency Lock Module T952SM/FL is to be plugged onto the
Terminal Transmitter’s circuit board.
• Reference Module T938RM with drive circuits for FL-bus, controlled by the Central
Unit.
• Bus Amplifier T938BA = T938RM without ref. tone generator, with drive circuits for the
FL-bus.
• Modem Compensator T938MC compensates for time delay in a T938S modem-pair.
Older transmitters that can be frequency locked are the H950T HF Terminal Transmitter,
with circuit board number 40291 or higher, and U951T UHF Terminal Transmitter. They
both use Frequency Locking Module T950FL.
Systems with frequency locked transmitters fall into two basic categories: those without
modems to the transmitters, and those that have at least one modem-pair. Three twisted-
pairs carry all communication between the central and terminal transmitter site.
3.2 Without Modem to Transmitters
The transmitters are connected to the D-bus and FL-bus. If the max length for the FL-bus is
exceeded, the transmitter’s speech bus must be connected to the FL-bus on the Reference
Module or Bus Amplifier. Several transmitters may be connected to the D-bus provided the
TD 90227GB
2006-09-18/ Ver. C
System Installation
On Site Paging System
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3 km max total length is not exceeded. Each Reference Module and Bus Amplifier has two
FL-bus outputs. The D- and SP/FL-buses must be correctly polarized.
A-bus R-line
FL-bus
D-bus
Central
Unit
PBX
Interface
Reference
Modul
Receiver
Interface
to terminal site
R-line
FL-bus
D-bus
to central site
Fixed
Receiver
Terminal
Transmitter
Figure 4. System solution: 2-way speech, private lines without modem.
3.3 With Modem to Transmitters
Data and Speech modem introduces delay in the transmitter signal. Transmitter signals “in
the air” will differ and cause distortion in areas of overlapping coverage. A basic rule in
planning an installation is to delay the signals to transmitters equally.
The transmitter code on the D-bus is always generated by the Central Unit. Be sure that
the same number of modem-pairs are used between the Central Unit and each Terminal
transmitter. Several Terminal transmitters can be connected to one Data modem if the
location is suitable.
Synchronize the data modems for the D-bus, see the figure below:
Reference
Module
Control Synchronizing D-line
Delayed buses
direct to terminal site
A-bus
SP-bus
D-bus
System bus to
other units
SP-line
A-line
D-line
Lines via modem
at terminal site
R-line
D-bus
FL-bus
Central
Unit
Data
Modem
Data
Modem
Speech
Modem
Modem
Compensator
Data
Modem
Data
Modem
Receiver
Interface
Figure 5. Private lines with Speech Modem.
Speech signals may come from several different units, for example PBX Interface, Receiver
Interface or Control Keyboard. If speech modems are used with any transmitters, the
modem compensator must be used at those terminal sites where speech is fed into the
TD 90227GB
2006-09-18/ Ver. C
System Installation
On Site Paging System
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system. The Modem Compensator delays speech that is fed in locally by an amount
equivalent to the delay produced in a speech modem-pair with up to 3 km cabling
between them. The output signal from the Modem Compensator is DFL, “Delayed
Frequency Lock”, and has the same electrical characteristics as the FL-bus. If necessary,
DFL can be amplified by the Bus Amplifier. DFL is connected to the speech bus in the
Terminal Transmitter. Several modem compensators can be connected in series to
compensate for several modem-pairs in series.
DFL
R-line
D-line
SP-line
A-line
A- ,B- ,SP-bus
Speech
Modem
Modem
Compensator
Fixed
Receiver
Terminal
Transmitter
Data
Modem
Receiver
Interface
Data
Modem
Figure 6. Terminal site with SP-bus.
4 Receivers
Talk-back Receivers are always connected to a RI (Receiver Interface), which in turn is
connected to the A- and SP-buses. Up to four receivers may be connected to the same RI,
each with a separate twisted-pair that must not exceed 1 km. Move the RI closer to the
receivers if the distance exceeds 1 km or use modems to extend the A-, B- and SP-buses of
the RI.
Note that the twisted-pair (R-line) between each receiver and its interface is not included
in the system modular bus and must therefore be connected separately, even when the
units are mounted together. When the Receiver is not activated, this line always carries a
quality tone of about 2.4 Vp-p measured between L1 and L2. When the receiver is
TD 90227GB
2006-09-18/ Ver. C
System Installation
On Site Paging System
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activated, the signal on the line is a combination of speech, data, subtone, and quality
tone. The line is not polarized
D-, SP-bus
A-, SP-bus
1 km
1 km
Receiver
Interface
Fixed
Receiver
Terminal
Transmitter
Fixed
Receiver
.
Figure 7. Receivers connected to the Central Unit via the Receiver Interface.
5 Antennas
Several types of antennas are used in the OSP System, such as ground-plane, dipole and
helix antennas but the choice of type should be made to suit the actual site. In some cases
other types of antennas may be required due to the terrain or climatic conditions. Note
that dipoles must be ordered for the correct frequency.
In general, 900-system antennas can be grounded if necessary, but large potential
differences between different ground points can cause problems. Therefore, antenna
grounding should be avoided if possible.
HF
VHF
UHF
25% of
mast height
GP 4103
CXL-2
1,25 m
CXL-70
0,9 m
Wall brackets FM-103
Mast pipes Ø 50 mm x 3 m (2 ea)
0,5 m
0,5 m
2 m
Figure 8. Antenna reliability measures.
Este manual sirve para los siguientes modelos
51
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