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11 พย. 2547 1 Terrestrail Transmission Department อารมย์ ชื่นศิริ ฝ่ายสื่อสัญญาณภาคพื้นดิน โทร 2272 ระบบสื่อสัญญาณวิทยุ ไมโครเวฟ.

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Presentation on theme: "11 พย. 2547 1 Terrestrail Transmission Department อารมย์ ชื่นศิริ ฝ่ายสื่อสัญญาณภาคพื้นดิน โทร 2272 ระบบสื่อสัญญาณวิทยุ ไมโครเวฟ."— Presentation transcript:

1 11 พย Terrestrail Transmission Department อารมย์ ชื่นศิริ ฝ่ายสื่อสัญญาณภาคพื้นดิน โทร 2272 ระบบสื่อสัญญาณวิทยุ ไมโครเวฟ Microwave Radio System

2 11 พย เครือข่ายเชื่อมโยงระบบ UHF เครือข่ายเชื่อมโยงระบบ MICROWAVE - เครือข่ายเชื่อมโยงระบบ MICROWAVE - เครือข่ายเชื่อมโยงระบบ DRMASS & TDMA - เครือข่ายเชื่อมโยงระบบ LASER LINK - ฯลฯ Contents - เครือข่ายเชื่อมโยงระบบ SATELLITE

3 11 พย UHF Radio Link

4 11 พย System Configuration

5 11 พย Specifications

6 6 2.4 GHz TDMA P-MP System

7 11 พย GHz TDMA P-MP System

8 11 พย GHz TDMA P-MP System

9 11 พย DRMASS (Digital Radio Multiple Access Subscriber System)

10 11 พย DRMASS

11 11 พย DRMASS

12 11 พย ระบบจานสายอากาศ DRMASS

13 11 พย (JRC Model JUL-255 Series) Subscriber Station

14 11 พย ลูกค้าระบบ DRMASS สถานีฐาน บางรัก

15 11 พย TDMA (Time Division Multiplex Access ) 10.5 GHZ band and Point-to-multipoint 10.5 GHZ band and Point-to-multipoint Broadband IP and Leased Line Connection Broadband IP and Leased Line Connection Broadbamd State-of-Art Design of Equipment Broadbamd State-of-Art Design of Equipment Quick amd Easy Installation Quick amd Easy Installation

16 11 พย TDMA (Time Division Multiplex Access )

17 11 พย Specifications

18 11 พย TDMA (Product) Central Station

19 11 พย TDMA (Product) Repeater

20 11 พย Radio Relay Systems Microwave System

21 11 พย 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)SDH ring networks (trunk or regional network) Fixed networks for GSM operatorsFixed networks for GSM operators TV distribution networksTV distribution networks –Integrated protection switching up to 14+2 or 1+1 hot standby for improved transmission quality

22 11 พย 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 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 11 พย 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 11 พย 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 % Even this causes 26 sec./month: bad for data More important to control the # of outages rather than the total time (distribution)

25 11 พย

26 11 พย Classical Design Channel e.g. 2 Mbit/s 155 Mbit/s MD Modulator DM Demodulator RX Receiver BB = Basisband DS = Data signal IF =Intermediate Frequency e.g. 140 MHz RF = Radio frequency e.g. 7,5 GHz, 18,7GHz TX Transmitter Circulator, filter waveguide Channel e.g. 2 Mbit/s 155 Mbit/s Circulator, filter waveguide

27 11 พย Classical Design Transmit side Channel 3 Channel 2 Channel 1 TXMD Channel 1 TXMD Channel 2 TXMD Channel 3 DM RX Waveguide CBN TXMD DMRX DM Channel 3 Channel 1 MDTX Transmit side Receive side

28 11 พย Frequency Patterns –Basic design –Example: 8 RF channels –Differences depending on frequency range –Compliance with ITU f1 f1a f2 f2a f4 f4a f3 f3a f1` f1b f2` f2b f4` f4b f3` f3b Duplex spacing Channel width Channel spacing Lower side-bandUpper side-band Allocated frequency range

29 11 พย Long Haul SDH Radio Systems

30 11 พย Long Haul SDH Radio Systems Rack Configuration 1+1 Hot-Stand-By

31 11 พย Rack Configuration N+1/N+2 (3+1)Rack Configuration N+1/N+2 (3+1) Long Haul SDH Radio Systems

32 11 พย Long Haul SDH Radio Systems Rack Configuration N+1/N+2 (7+1)Rack Configuration N+1/N+2 (7+1)

33 11 พย Long Haul SDH Radio Systems Rack Configuration N+1/N+2 (14+2)Rack Configuration N+1/N+2 (14+2)

34 11 พย Long Haul SDH Radio Systems Rack Configuration 7+1 without XPICRack Configuration 7+1 without XPIC

35 11 พย Long Haul SDH Radio Systems Rack Configuration 14+2 with XPICRack Configuration 14+2 with XPIC

36 11 พย Microwave Radio Systems STM ,08 Mbit/s Long and short haul systems

37 11 พย STM-4 Transmission via Radio Transparent STM-4 transmission with DPU STM-4Transparent STM-4 transmission with DPU STM-4

38 11 พย STM-4 Transmission via Radio Overhead Access Unit for TMN interface and service/wayside channels Fuses, power distributor SDH multiplexer MS1/4 Data processing Unit STM-4 Up to four Rx with or without space diversity extension Channel branching network Up to four Tx Modem Unit for two STM-1 data streams with XPIC Modem Unit for two STM-1 data streams with XPIC and with RPS-C System Example for Long Haul ApplicationsSystem Example for Long Haul Applications

39 11 พย Microwave Radio Systems Antennas

40 11 พย Antenna Portfolio Parabolic antennas m Shell antennas 2, 3 and 4 m Integrated antennas m

41 11 พย Waveguides ALFORM   Twistable   Bendable E,H   up to 200 m   GHz FLEXWELL   Bendable E,H   up to 200 m   GHz

42 11 พย Integrated Network Management - NSU Radio Relay ManagementRadio Relay Management Generic representation Comprehensive element management Display of diversity status Display of standby components Features:

43 11 พย 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

44 11 พย 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

45 11 พย 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

46 11 พย dish uplink stationdownlink station satellite transponder 22,280 miles Satellite Transmission Process

47 11 พย 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 Geosynchronous Orbit

48 11 พย Geosynchronous orbit satellites

49 11 พย 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

50 11 พย Frequency Bands Available for Satellite Communications

51 11 พย Satellite Transmission Applications television distribution – –a network provides programming from a central location – –direct broadcast satellite (DBS) long-distance telephone transmission – –high-usage international trunks private business networks

52 11 พย Satellite Disadvantages high initial cost susceptible to noise and interference propagation delay Satellite Advantages can reach a large geographical area high bandwidth cheaper over long distances

53 11 พย Satellite Antenna

54 11 พย Satellite Transmission Applications

55 11 พย Free Space Laser Communications

56 11 พย Introduction Free space laser communications – –a.k.a. Free Space Optics, Optical Wireless Basically a laser and a telescope Most are protocol independent Typical range < 4 km (.5, 1, 2, 4, 8km) Typical bandwidths: 10, 100, 1000 Mbps – –Lucent 10 Gbps DWDM (TeraBeam )

57 11 พย Key Features of Free Space Optic High speed transmission up to 622Mbps High reliable transmission No frequency allocation/license required Affordable price and low cost of ownership Easy management with CMS (Canon Management Software) Available for SNMP (Option)

58 11 พย Transmitters LED (single or multiple) – –1 mW typical Laser (single or multiple) – –10-20 mW typical, up to 100 mW Usually 785 or 850 nm, some 1310 nm Eye safety limit: 1.5 mW/cm^2 at 785 nm Multiple transmitters boost power, may also reduce scintillation fades

59 11 พย Detectors PIN Diodes -43 dBm typical Avalanche Photo Diodes (APD) -53 dBm typical (also greater dynamic range) Single or multiple detectors Larger aperture increases receive power, reduces scintillation fades Design goal: BER < 10^-9 typical

60 11 พย

61 11 พย Free Space Optical (Application)

62 11 พย Free Space Optical (Application)

63 11 พย Free Space Optical (Application)

64 11 พย Free Space Optical (Product)

65 11 พย Free Space Optical (Product)

66 11 พย ข้อมูลเกี่ยวกับผู้บรรยาย นาย อารมย์ ชื่นศิริ การศึกษา : B.Sc, B.Ind, M.Sc ที่ทำงาน : ส่วนสื่อสัญญาณวิทยุ ไมโครเวฟ บางรัก ฝ่ายสื่อสัญญาณภาคพื้นดิน โทรศัพท์ :


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