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Terrestrail Transmission Department E-mail : arom01th@yahoo

ระบบสื่อสัญญาณวิทยุไมโครเวฟ Microwave Radio System. อารมย์ ชื่นศิริ ฝ่ายสื่อสัญญาณภาคพื้นดิน โทร 2272. Terrestrail Transmission Department E-mail : arom01th@yahoo.com. Contents. - เครือข่ายเชื่อมโยงระบบ UHF. - เครือข่ายเชื่อมโยงระบบ DRMASS & TDMA.

bruce-mendoza
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Terrestrail Transmission Department E-mail : arom01th@yahoo

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  1. ระบบสื่อสัญญาณวิทยุไมโครเวฟระบบสื่อสัญญาณวิทยุไมโครเวฟ Microwave Radio System อารมย์ ชื่นศิริ ฝ่ายสื่อสัญญาณภาคพื้นดิน โทร 2272 Terrestrail Transmission Department E-mail : arom01th@yahoo.com

  2. Contents - เครือข่ายเชื่อมโยงระบบ UHF - เครือข่ายเชื่อมโยงระบบ DRMASS & TDMA - เครือข่ายเชื่อมโยงระบบ MICROWAVE - เครือข่ายเชื่อมโยงระบบ SATELLITE - เครือข่ายเชื่อมโยงระบบ LASER LINK - ฯลฯ

  3. UHF Radio Link

  4. System Configuration

  5. Specifications

  6. 2.4 GHz TDMA P-MP System

  7. 2.4 GHz TDMA P-MP System

  8. 2.4 GHz TDMA P-MP System

  9. DRMASS (Digital Radio Multiple Access Subscriber System)

  10. DRMASS

  11. DRMASS

  12. ระบบจานสายอากาศ DRMASS

  13. (JRC Model JUL-255 Series) Subscriber Station

  14. ลูกค้าระบบ DRMASS สถานีฐาน บางรัก

  15. TDMA (Time Division Multiplex Access ) 10 .5 GHZ band and Point-to-multipoint Broadband IP and Leased Line Connection Broadbamd State-of-Art Design of Equipment Quick amd Easy Installation

  16. TDMA (Time Division Multiplex Access )

  17. Specifications

  18. TDMA (Product) Central Station

  19. TDMA (Product) Repeater

  20. Radio Relay SystemsMicrowave System

  21. Why Microwave Radio Systems ? • High economic efficiency • Rapid implementation without cable installation • Very high level of system availability (> 99.99%) • Full SDH compatibility, transparent data transmission • Expandable transmission capacity • Universal application: • SDH ring networks (trunk or regional network) • Fixed networks for GSM operators • TV distribution networks • Integrated protection switching up to 14+2 or 1+1 hot standby for improved transmission quality

  22. The Microwave Link • Can be a single “hop” of 1 mile or less • Can be a backbone system covering over 1000 miles, with multiple hops • Usually 20-40 miles/hop over flat terrain for the 2-8-GHz range • Mountain to mountain can reach 120 miles • Up to the late ’80’s, microwave was still the most popular countrywide backbone system (now fiber) • Microwave is “line-of-sight” • Atmosphere can bend microwave

  23. The Microwave Link • Microwave frequencies commonly used are between 2 GHz and 38GHz • Antennas: • Microwave usually use parabolic type • Sometimes horn type • Both are highly directional • Beam is concentrated in a way similar to a telescope(receiver) and flashlight (transmitter) • Microwaves follow most of the rules of optics

  24. The Microwave Link • Performance: • Cannot predict exact outage time, but statistically-derived averages are available • 99% sounds good, but it means 14 min. per day • In a digital system, 99% would be devastating • Most common carriers design radio systems for 99.999% • Even this causes 26 sec./month: bad for data • More important to control the # of outages rather than the total time (distribution)

  25. Classical Design Circulator, filter waveguide Circulator, filter waveguide RF = Radio frequency e.g. 7,5 GHz, 18,7GHz TX Transmitter RX Receiver IF =Intermediate Frequency e.g. 140 MHz MD Modulator DM Demodulator BB = Basisband DS = Data signal Channel e.g. 2 Mbit/s 155 Mbit/s Channel e.g. 2 Mbit/s 155 Mbit/s

  26. Classical Design MD TX CBN CBN RX DM Transmit side Receive side MD TX RX DM Channel 3 Channel 1 MD TX RX DM Channel 2 Channel 2 MD TX RX DM Channel 1 Channel 3 Channel 1 DM RX TX MD Channel 3 Waveguide Receive side Transmit side

  27. Duplex spacing Channel width Channel spacing f1 f1a f2 f2a f3 f3a f4 f4a f1` f1b f2` f2b f3` f3b f4` f4b Lower side-band Upper side-band Allocated frequency range Frequency Patterns • Basic design • Example: 8 RF channels • Differences depending on frequency range • Compliance with ITU

  28. Long Haul SDH Radio Systems

  29. Long Haul SDH Radio Systems • Rack Configuration 1+1 Hot-Stand-By

  30. Long Haul SDH Radio Systems • Rack Configuration N+1/N+2 (3+1)

  31. Long Haul SDH Radio Systems • Rack Configuration N+1/N+2 (7+1)

  32. Long Haul SDH Radio Systems • Rack Configuration N+1/N+2 (14+2)

  33. Long Haul SDH Radio Systems • Rack Configuration 7+1 without XPIC

  34. Long Haul SDH Radio Systems • Rack Configuration 14+2 with XPIC

  35. Microwave Radio Systems STM-4 622,08 Mbit/s Long and short haul systems

  36. STM-4 Transmission via Radio • Transparent STM-4 transmission with DPU STM-4

  37. STM-4 Transmission via Radio • System Example for Long Haul Applications Up to four Rx with or without space diversity Fuses, power distributor extension Channel branching Overhead Access Unit network for TMN interface and service/wayside channels Up to four Tx Data processing Unit STM-4 Modem Unit for two STM-1 data streams with XPIC and with RPS-C SDH multiplexer MS1/4 Modem Unit for two STM-1 data streams with XPIC

  38. Microwave Radio Systems • Antennas

  39. Antenna Portfolio Integrated antennas 0.3...0.6 m Parabolic antennas 0.6 ....3.7 m Shell antennas 2 , 3 and 4 m

  40. Waveguides ALFORM  Twistable  Bendable E,H up to 200 m 3...30 GHz FLEXWELL  Bendable E,H up to 200 m 3...24 GHz

  41. Integrated Network Management - NSU • Radio Relay Management Features: Generic representation Comprehensive element management Display of diversity status Display of standby components

  42. Satellite Communication • a microwave relay station in space • can relay signals over long distances • geostationary satellites • remain above the equator at a height of 22,300 miles (geosynchronous orbit) • travel around the earth in exactly the time the earth takes to rotate

  43. Satellite-Related Terms • Earth Stations – antenna systems on or near earth • Uplink – transmission from an earth station to a satellite • Downlink – transmission from a satellite to an earth station • Transponder – electronics in the satellite that convert uplink signals to downlink signals

  44. Satellite Transmission Links • earth stations communicate by sending signals to the satellite on an uplink • the satellite then repeats those signals on a downlink • the broadcast nature of the downlink makes it attractive for services such as the distribution of television programming • Line-of-sight microwave communication using satellite

  45. Satellite Transmission Process satellite transponder dish dish 22,280 miles uplink station downlink station

  46. Geosynchronous Orbit To ensure constant communication, the satellite must move at the same speed as the earth Only one orbit can be geosynchronous Three satellites are required to provide full global transmission

  47. Geosynchronous orbit satellites

  48. Principal Satellite Transmission Bands • C band: 4(downlink) - 6(uplink) GHz • the first to be designated • Ku band: 12(downlink) -14(uplink) GHz • rain interference is the major problem • Ka band: 19(downlink) - 29(uplink) GHz • equipment needed to use the band is still very expensive

  49. Frequency Bands Available for Satellite Communications

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