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Summary of Contents for ASCOM telePROTECT 900
- Page 1 TD 90227GB System Installation On Site Paging System 2006-09-18/ Ver. C...
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Page 2: Table Of Contents
System Installation TD 90227GB 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 .................... -
Page 3: Introduction
System Installation TD 90227GB On Site Paging System 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. -
Page 4: Data Buses
System Installation TD 90227GB On Site Paging System • 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. -
Page 5: Extended Wiring Lengths
System Installation TD 90227GB On Site Paging System 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. - Page 6 System Installation TD 90227GB On Site Paging System 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. Terminal Central Transmitter Unit Slave Transmitter D-bus 3 km Slave...
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Page 7: Frequency Locked Transmitters
System Installation TD 90227GB On Site Paging System 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. -
Page 8: With Modem To Transmitters
System Installation TD 90227GB On Site Paging System 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. Central Reference Receiver Unit Interface Modul Interfac A-bus R-line... -
Page 9: Receivers
System Installation TD 90227GB On Site Paging System 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. -
Page 10: Antennas
System Installation TD 90227GB On Site Paging System activated, the signal on the line is a combination of speech, data, subtone, and quality tone. The line is not polarized Terminal Transmitter D-, SP-bus Receiver Fixed Fixed A-, SP-bus Interface Receiver Receiver 1 km 1 km... -
Page 11: Uhf Antennas
System Installation TD 90227GB On Site Paging System UHF Antennas UHF transmitters in the 900 system use a CXL-70, a broad band half wave coaxial antenna for 406-470 MHz. The antenna is dc-short-circuited, and has an “N” type connector. CXL-70 is mounted at the top of an antenna mast or with a supporting boom. The boom should be at least 0.5 m. -
Page 12: Antenna Location
System Installation TD 90227GB On Site Paging System If an antenna cannot be installed in a normal manner or if the coaxial cable has an excessively high standing-wave ratio, the antenna tuner can be used to match the transmitter impedance to the antenna (for example boat installations, culverts, or cellars). Slave Terminal Slave... -
Page 13: Antenna Cables
System Installation TD 90227GB On Site Paging System Antenna Cables Keep coax cables between transmitter/receiver and antenna as short as possible. Use only cable type RG-8 or RG-213. The attenuation in these types is about 0.8 dB/10m at VHF, and 1.5 dB/10m at UHF. (6 dB attenuation reduces coverage by 50%.) Power Supply All units use 12.5 V DC and can be powered separately, but normally a common power supply feeds all the units that are placed together in one location. -
Page 14: Addressing
System Installation TD 90227GB On Site Paging System Line Equipment max Load (A) Talk-Back Equipment max load (A) T938D T981RI T938S 0.15 U980 T938MC V980 T938RM T938BA T938BC2 0.25 Central Equipment max Load (A) Charging Equipment max Load (A) and Interfaces T942C T961 (all versions) 0.15... - Page 15 System Installation TD 90227GB On Site Paging System The address consists of two hexadecimal digits that are selected by the eight sections of the address switch. Sections 5-8 of the switch select the first (most significant) digit and sections 1-4 select the second digit. Sections 1 - 4 second hex digit (D) Sections 5 - 8...
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Page 16: System Check
System Installation TD 90227GB On Site Paging System For several reasons an address register should be kept for each installation, with the name, address, and location of each unit. Address Register Address (hex) Unit Location T942C Attic, head office T940PX Exchange room, head office T840IU Exchange room, head office... -
Page 17: Combined Systems
System Installation TD 90227GB On Site Paging System normal operation decreases the performance of the handset and also radically decreases its battery operating time. Be sure that the battery saving time in the handset and the Central Unit is identical. Note: Messages and alarms sent from the system to the handset, must be transmitted with at least one repetition in order to secure a reliable system. - Page 18 System Installation TD 90227GB On Site Paging System An essential difference between the old 800 system and the OSP systems is that the 800 system must be grounded at only one point if the units are dc coupled. This must be considered when planning a combined system installation.
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