[PPT]PowerPoint Presentation - Gadjah Mada warsun/telkom/ viewCO send: Ringing signal to dialed...

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Transcript of [PPT]PowerPoint Presentation - Gadjah Mada warsun/telkom/ viewCO send: Ringing signal to dialed...

  • Telephone System

    By : Warsun Najib

  • Telepon System Concept

    Telephone network is often called as PSTN (Public Switch Telephone Network)Telephone DeviceCentral Office (CO)

    suatu istilah untuk menggambarkan pusat jaringan telepon (dalam suatu kota). Tugasnya menyediakan daya untuk telepon, me-routing panggilan, merekam tagihan telepon, dsb.

    Trunk (E1)Link/kabel between CO to other CO Local Loop

    Pasangan kabel telepon yang terhubung antara central office dan pesawat telepon rumah (kantor).

    Switch

    Perangkat yang me-route komunikasi ke bagian (tempat) yang lain.

    Pada awalnya, switch terbuat dari banyak switch-switch mekanikSaat ini, mayoritas switch adalah elektronis, bahkan digital. Digital switches lebih reliable, dan menawarkan banyak keuntunganDistribution NetworkMDFRumah Kabel

  • Telephone Set

    Standby : Hoook switch is on position 1, Idc from CO does not come, Ringing signal (ac) can activate Bell

    Busy : Switch is off-hook (hook-switvh on position 2),

  • Telephone : Off-Hook / Busy

    H

    D

    IDC

  • Side Tone

  • Dialing System

    DTMF (Dual tone multi frequency)Rotary Switch

  • Dual Tone Multi-frequency

  • DTMF

    Periode T > 100 ms depend on how fast finger push the button (normally 250 ms)

    Digit 1

    Digit 6

    T

    T

    i(t)

    t

    space

  • Dialing : Rotary Switch

    1 one stop pulse

    2 two stop pulse

    3 three stop pulse

    0 ten stop pulse

  • Rotary switch dialing system

  • Subscriber link signal (Link Voltage)

    Volt

    100

    50

    0

    -50

    -100

    -150

    On-hook

    Off-hook

    Dialing pulse

    voice

    Bell, ringing voltage

    20 Hz, 90 Vrms, 2 s on, 3 s off

    Incoming

    Outgoing

    1-2 V

    ingoing

    0,5-1 V

    v: 48 V

    I: 18 mA

    I:16-20 mA,

    6-8 V

    48 V

  • Switching Element

    Controller can be :

    SentralizedDistributed at signaling and switcing Device

    SLIC : Subscriber Line Interface Circuit

    To/from other CO

    Central Office

  • Switching System

    Step By Step,

    Each digit activates directly one switching-level, except the last 2 digit usually connected to 2-dimension switch

    3054

    3

    0

    5

    4

    Call Finder

    Switch level 1

    Switch level 2

    Switch level 3

    Switch level 4

  • Illustration of Call Switching

  • Common Control

    Each digit of dialed number is first stored in a register at CO, then if the destination number is not busy, call is routed to the phone.

  • Switching Process of Telephone Call

    Caller lift handset / off hook

    CO find the available link

    Get a link

    CO send dial-tone to caller

    Caller dial the destination number

    Yes

    No

  • CO make switching process

    Is dialed number

    free (not busy) ?

    CO send:

    Ringing signal to dialed phoneRinging tone to caller phone

    (tuut tuut..)

    CO send busy tone

    to caller phone

    Call drop

    Called phone

    Off hook

    Call success

    yes

    no

    yes

    No

  • Voice Signaling

    Nama Signal

    Kegunaan

    Off-hook

    Memberitahu CO bahwa user ingin melakukan panggilan

    Dial tone

    Memberitahu user bahwa CO sudah siap melayani (ready)

    Ringback tone

    Memberitahu user bahwa telepon tertuju sedang berdering

    Ringing voltage

    Tegangan tertentu yang dikirim untuk membunyikan bel

    Busy signal

    Memberitahu user bahwa telepon tertuju sedang sibuk

    On-hook

    Memberitahu CO bahwa user akan memutus sambungan

    Flash

    Kombinasi on-hook dan off-hook

  • Private Branch eXchange

    CO

    ...

    Common Subscriber

    PBX

    90XXXX

    m ext-link

    ...

    Operator

    n main link

    2201

    2202

    1302

  • PBX is categorized:

    PMBX private manual branch exchangeBoth intern and extern call is handled by an operatorPABX-private automatic branch exchangeIntern call is automaticExtern callAutomatic if the device has DID (direct inward dialing)Via operator If device does not have DIDIf n >1 (link between co-pbx)User call via one number if PABX has hunting systemUser can call via n different number if PABX doesnt have hunting system.Advantage of PBXCostProbability of success call

  • Numbering System

    Open SystemClose System

  • Network from CO to Subscriber

    LE

    -

    MDF

    DP

    DP

    DP

    PBX

    Primary network

    Secondary network

    MDF 2000 pairs

    CCP 50 pairs

    DP:10 pairs

    MDF,CCP,DP are in a form of cable switching terminal

  • Network Between LE

    One local area

    IDC

    Nama Signal Kegunaan

    Off-hook

    Memberitahu CO bahwa user

    ingin melakukan panggilan

    Dial tone

    Memberitahu user bahwa CO

    sudah siap melayani (ready)

    Ringback tone

    Memberitahu user bahwa

    telepon tertuju sedang

    berdering

    Ringing voltage

    Tegangan tertentu yang

    dikirim untuk membunyikan

    bel

    Busy signal

    Memberitahu user bahwa

    telepon tertuju sedang sibuk

    On-hook

    Memberitahu CO bahwa user