Seminar HFC Networks

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    Schlgl 2005

    Seminar

    HFC networks

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    Seminar HFC networks

    Block diagram of an HFC system (4)The performance of an HFC system (5)Professional reception systems (6)Headend technology for digital and analogue TV and radio signals (7)

    Headend for network monitoring (KOM/HMS standard) (8)Headend for ingress detection SIMS (9)Headend technology for the Internet (CMTS) (10)Provisioning software for the Internet according to DOCSIS (11)HFC measuring device (12)Forward path and return path matrix (13)Optical star in 1310 nm technology (14)1310 nm transmitters (15)1550 nm analogue transmission; DWDM, CWDM, optical pushpull (16)Passive optical components (17)Optical compact node ORA 820/821 (18)Fibre node for the BK 862 of the KDG (German Postal Telegraph and Telephone PTT) (19)

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    Seminar HFC networks

    CATV / HFC amplifiers (20)Amplifier point BK 862 of the KDG (German PTT) (21)Trunk amplifier and node system GGA 8 (22 and 23)VGF/VGP 90xx trunk and line amplifier system (24)

    VGF/VGO 938 line amplifier system (25)Broadband return path amplifier (26)The in-building network (27 and 28)KOM / HMS transponder (29)DOCSIS cable modem (30)Technical appendix (31)Downstream broadband interferences CSO and CTB (32)Addition of distortion ratios (33)Upstream broadband composite intermodulation noise CIN (34)C/N and S/N ratios; modulation gain (35)Echo attenuation in the coax part of the HFC system (36)AGC; ALSC; Long Loop AGC (37)

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    Block diagram of an HFC system

    Headendfor

    digital and analogueTV- and Radiosignals

    Cable Modem TerminationSystem

    with Provisioning Software

    VoiceGate

    Internet Service ProviderISP

    Video- on- demand Status MonitoringSystem

    V 5.2 Interfaceto the TELECOM

    Forward Reversemultiplexer multiplexer

    Optical transmission:Mono mode standard fibrePoint- to- pointPoint- to- multipoint1310 nm +/- 10 nmDirect intensity modulated

    Antenna array

    Opt.coupler

    HMS Standard

    SweepSystem

    Transmission and service capability

    Way(VoIP)

    Videoserver

    Billing Ingress controlReverse remote switch

    Reverseunitygain

    Fast Internet and VoIP

    Fast Internet access

    Fast Internet, VoIP and video streaming

    Residential Gateway: Fast Internet ; VoIPMPEG Decoder; USB; Blue tooth

    Status monitoring and ingress control

    System Sweeper, in order to aligne forward-and reversepath

    BillingStatus monitoring

    ISP Reverse pathnecessary

    (Options)

    Add- on units like switches, routers, PC`s, TV `s etc. not shown

    Reversepath

    receiver

    Forward

    transmitter

    CM

    EMTA

    EMTAIP

    streamingbox

    Residential gateway

    House amplifier

    Splitter

    House net

    Base package: Transmit a number of digitaland analogue TV- and radio channels to thesubscribers (No reversepath necessary)

    Data services:

    Linetap

    Trunkamplifiers

    Lineamplifier(s)

    Headends

    Status monitoring transponder

    Trunk

    L i n e

    Option: Redundancy

    Multimedia sockets

    Star distribution

    5 - 65 MHZ

    85 - 862 MHZ

    Optical node

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    The performance of an HFC system

    An HFC ( Hybrid-Fiber- Coax) system, like a return path compatible CATV ( Ca ble Tele vision) system,receives all possible services - including radio, TV, Internet, telephony etc. - at a central point, andtransmits them to various subscribers. The individual traditional transmission blocks can be divided into

    - headend(s); channel-selective

    - optical transmission network; broadband

    - coaxial trunk and line network; broadband

    - the in-building networks; broadband

    The physical transmission medium is the coaxial cable (CATV), and for longer distances monomode fibre(HFC). The physical coverage can be 200 km or more, i.e. the number of subscribers can certainly be

    100,000 or more.The forward frequency range is typically set to 80 - 862 MHz, and the return path from 5 - 65 MHz. Thesignals are transparently transmitted using both analogue and digital modulation. In the forward path, up to90 analogue TV channels can be transmitted in a 7/8 MHz pattern or, depending on the data compression,significantly more digital radio/TV channels in conjunction with pure data channels for the Internet.Additional equipment at the headend and at the subscriber facilitates cable telephony, video on demand

    and much moreHFC systems are planned on a customer-specific basis, and are mainly realised using products complyingwith a specification.

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    Professional reception systems

    For terrestrial reception (TV; FM and DVB-T);in acc. with the PFL 3 specification (50 Ohm)of the KDG (German PTT)For terrestrial reception (TV; FM and DVB-T);

    in acc. with the TL 5820- 3003 (75 Ohm) ofthe KDG (German PTT)Offset dish antennas acc. to KDG 1TS3; withreflector and feed arm heating and multifeedreceptionCentrally fed dish antennas acc. to KDG

    1TS1Outside temperature control:

    - Outside temperature - reflector temperature - Snow cap - soiling

    Standard outside temperature control withelectronical two-level controller and settabletemperature controlQuad feeder systems for central / offset dishantennas acc. to the KDGs delivery terms

    CAS 123 (centrally fed) and CAS 180 (offset) with heating

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    Headend for network monitoring (KOM/HMS)

    Monitors the status and records informationabout an HFC broadband networkConsists of one or more multi-protocol HECcontrollers, one or more view- PCs todisplay the collected information on thesynoptic board and a number of monitoring

    transpondersMonitors the headend (output level), opticaltransmitters, optical receivers, coax amplifiers(BK 862, GGA 8, compact amplifiers, houseamplifiers) and other peripheral devices if thecorresponding monitoring transponder is

    usedActivates the 3-stage Ingress-switch in thereturn path componentsOperates conforming with both the KOM andHMS standard and third party equipmentPolling mode; Auto detection of transponders;Contention modeAlarm indications are pre-set, but also user-definable; Allows to automate any task thatcan be manually performedForwards specific alarms to email,pager,SMS

    SNMP Proxy Agent and SNMP managers

    TCU 30

    Reset

    Power

    Power HD

    I

    O

    K ey b oa rd R es e t

    48x CREATIVEd isccompact

    TAM 9700 Series Headend Monitoring System

    1 2 3 4 5 6 7 8

    Omni

    Probe

    ABCD

    FREQ

    CCM

    HarmonicLigthwaves

    HL485

    LOCAL

    SAM

    MCU

    PWR

    TAM 9700 Series Headend Monitoring System

    1 2 3 4 5 6 7 8

    Omni

    Probe

    ABCD

    FREQ

    CCM

    HarmonicLigthwaves

    HL485

    LOCAL

    SAM

    MCU

    PWR

    HEC controller TCU 40 with SIMS analyser

    Synoptic board

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    Headend for Ingress Detection SIMS

    SIMS (Scanning Ingress Monitoring System)is an option to KOM; 19 inch rack mountSIMS fully automatically monitors any wantedcarriers as well as unwanted ingress spikesin the return paths (5 to 75 MHz);

    Spectrum analyser(s) with 4 periodicallyconnected inputs; 60 dB dynamic rangeDisplay on the KOM view monitor2D and 3D spectrum mode; Amplitude-timemode; display plane; normalized modeExtremely high scanning speed of 5600

    frequencies per second; 50 kHz stepsSpurious

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    Provisioning Software for the Internet acc. to DOCSIS

    Registration of modems and hostsIP administrationDetermining of QoS profilesSetting for the host rangesDetermining the parameters for BPI profiles

    (data encryption)TFTP, DHCP and TOD serversSQL data bankZOPE managment systemSNMP query of the modem parameters

    Three user levelsBilling basic packet/Billing outgoinginvoices/Billing traffic assessmentModem monitoring

    Transmission/reception level; S/N; packet-errors; micro reflections

    ISP additional servicesServer 1 GHz CPU; raid 40 GbyteRedHat Linux 7.2

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    HFC measuring device

    RF

    75

    max0.5W

    DC

    Mains

    Vol+

    Vol-

    Ch- CH+

    7 8 9

    4 5 6

    1 2 3

    0 . -

    GHzns

    MHzs

    KHzms

    dB..s

    OnOff

    Mode

    Copy

    Help

    SAT / TV / FM - TEST -RECEIVER MSK 33

    CH : .SO TVLEV : 37.2dBV

    MVG 10

    RF

    75

    VIDEO . SWEEP - GENERATOR

    On

    Off

    Men

    Select - +

    7 8 9

    4 5 6

    1 2 3

    0 .

    s -ch

    CH : .SO TVLEV : 37.2dBV

    MVG 10

    RF

    75

    VIDEO . SWEEP - GENERATOR

    On

    Off

    Men

    Select - +

    7 8 9

    4 5 6

    1 2 3

    0 .

    s -ch

    CH : .SO TVLEV: 37.2dBV

    MVG 10

    RF

    75

    VIDEO . SWEEP -GENERATOR

    On

    Off

    Men

    Select - +

    7 8 9

    4 5 6

    1 2 3

    0 .

    s -ch

    Detailed and accurate analysis in the