TV broadcasting system design for a business center
Our design organization has developed a project estimate documentation for a TV broadcasting system for an office building.
TV DESIGN
The system of collective reception of air is built on the basis of the head station OH50, produced by "WISI". The station includes: - OH85H Transmodulator DVB-S / DVB-S2 - QAM (two-channel, HD, 2xCI, PID-filter) - 18 pcs .; - OH38 Two-channel audio / video modulator - 1 pc .; - OH45 Analog ether converter - 18 pcs; - OH51 Management Module (SNMP) - 2 pcs. The system of collective broadcasting reception is built in accordance with the requirements of GOST R 52023-2003 "Network distribution systems provides broadcasting of television cable television received", programs for subscriber receivers in the 47-862 MHz band. TV is built on the basis of the OH50 "WISI" head station. The OH50 "WISI" is a headphone that supports analog and digital TV signals. The station of new generation, Switchgear (couplers, dividers) have a frequency range of 5-862 MHz. In accordance with the technical specifications of JSC "Lentepriyem" ref. 408 of 09/22/11, reception and distribution of 18 terrestrial channels of St. Petersburg is secured, and the system also provides for reception and distribution of satellite television programs. The system includes: - antenna structures, - the head station, - amplifying and distribution equipment. The system is designed to connect 144 subscribers. ; On the roof of the building of metal structures OAT-1, made by LLC PF AKT. Metal structures are supplied complete (mast MT-6, weights, extensions) Antennas should be installed in accordance with page 14. Installation sites for metal structures with television antennas, satellite antennas are updated according to the results of level measurements, evaluation of the quality of television signals, search for best reception points. ; All works on the installation of metal structures with masts and grounding are carried out according to the drawings of the architectural and construction part of the project.
DESIGN TV SYSTEM
The signal from the antennas comes to the OH50 "WISI" head station. From the TV headquarters, the signal is distributed to the floors using the diSAT couplers. On each floor in the SS niche, subscriber taps of the "diSAT" company are installed on 4 taps. To connect offices of floors 2-8 provides 1 subscriber tap. Equipping offices 2-8 floors with television outlets is carried out on a separate project, due to the tenant. TV outlets are installed in the public areas on the ground floor. TV receivers are supplied by the customer. Also sockets are installed in office rooms - pom. Security (8.3, 13.3.1), pom. Security (-1 floor 2.3.2), DDC (13.2). To compensate for the drop in signal levels, antenna amplifiers are used, as well as an 8 SAT + 1 TV-DY90 “WISI” amplifier. The OH38 “WISI” dual A / V modulator is designed to transmit signals from external sources to a home distribution network (DVD player, local television studio, conference communication system, etc.), modulates two A (mono / stereo) / V A signal in two analog TV channels of a range of 45-862 MHz. For the conversion of terrestrial television channels to the home distribution network, terrestrial converters OH45 are used. OH51 Management Module (SNMP) is designed for remote control and monitoring of OH50 station. Module connects to Ethernet. The system has a reserve for development (the possibility of increasing the number of channels, as well as various services). From the headend, the signals go to the home distribution network (DRS).
TV SYSTEMS
DRS calculation was made in accordance with GOST R 52023-2003 “Distribution networks of cable television systems. Main settings. Technical requirements. Methods of measurement and testing. The following equipment is included in the DDS: - trunk couplers of the OTM series of the "diSat" production - subscriber taps of the OAT series of the production of "diSat" - house amplifiers of the VX26M production of "WISI"; - TV outlet TV-FM "Legrand". Subscriber ”Trunking taps should be installed next to the TOS in rack 19 and set the taps in the CC niches or behind the suspended ceiling in the switching box 160x135x77“ ABB ”. Drop cables to antenna amplifiers should be performed with N48X “BetaCavi” cable, then to the head station with N48X “BetaCavi” cable. Drop cables from antennas to lay on the roof in the metal hose RZ-TsH-32 D = 32 mm. To carry out the home distribution network with the N71 “BetaCavi” cable, separate sections see sheet 7 with the NAP115 “BetaCavi” cable. Run short sections of the DSU with the cable N48X "BetaCavi". DDS cables should be laid in a metal tray (the tray is provided by the project SKS.ST). Outside the tray, lay cables in corrugated PVC pipes D = 20 mm behind the suspended ceiling, in the absence of a suspended ceiling in smooth PVC pipes D = 20 mm. From the house coupler to the TV socket, run the N48X “BetaCavi” cable. In some cases, the sheet. 7 Route the N71 / NAP115 “BetaCavi” cable to the room where the socket is located. Lowering to the outlet to perform the cable N48X "BetaCavi". The lows from the level of the suspended ceiling to television outlets should be performed in a shade in a corrugated PVC pipe D = 20 mm. to be powered from the AC network ”Equipment installed in a rack 19 with a voltage of 220V (1 phase) in the 2nd category of reliability. For uninterrupted operation of the system provides an uninterruptible power supply. In the places of cable routes in the holes punched in the walls, install metal sleeves d = 50m. Holes zapenit fire extinguishing composition. The TV system is laid after the networks OV, VK, EM, EO. Power supply of devices with a voltage of 220 V, 50 Hz according to the 2nd category of reliability is carried out according to the electrical part of the project in accordance with the task attached to this project.