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Telephone System By : Warsun Najib. Telepon System Concept Telephone network is often called as PSTN (Public Switch Telephone Network) Telephone Device.

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Presentation on theme: "Telephone System By : Warsun Najib. Telepon System Concept Telephone network is often called as PSTN (Public Switch Telephone Network) Telephone Device."— Presentation transcript:

1 Telephone System By : Warsun Najib

2 Telepon System Concept Telephone network is often called as PSTN (Public Switch Telephone Network) Telephone Device Central 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 mekanik Saat ini, mayoritas switch adalah elektronis, bahkan digital. Digital switches lebih reliable, dan menawarkan banyak keuntungan Distribution Network MDF Rumah Kabel

3 Telephone Set Standby : Hoook switch is on position 1, I dc from CO does not come, Ringing signal (ac) can activate Bell Busy : Switch is off-hook (hook-switvh on position 2), Hibrid Pemisah mic dengan speaker Penekan nada samping Dialer Mic Speaker Bell Hook Switch 1 2

4 H D Telephone : Off-Hook / Busy

5 Side Tone

6 Dialing System DTMF (Dual tone multi frequency) Rotary Switch

7 Dual Tone Multi-frequency # # 0 0 * * Baris 1 [697 Hz] Baris 2[770 Hz] Baris 3[852 Hz] Baris 4[941 Hz] Kolom 1 [1209 Hz] Kolom 2 [1336 Hz] Kolom 3 [1477 Hz]

8 Periode T > 100 ms depend on how fast finger push the button (normally 250 ms) Digit 1 Digit 6 T T i(t) t DTMF space

9 Dialing : Rotary Switch 1 one stop pulse 2 two stop pulse 3 three stop pulse … 0 ten stop pulse

10 T/3 T :100 ms 4T 3 2' i(t) t space Dial a number Off-hook 0 Rotary switch dialing system

11 Subscriber link signal (Link Voltage) Volt 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 Δv: 48 V ΔI: 18 mA I:16-20 mA, 6-8 V 48 V

12 register Switching Device Controller trunk SLIC Pengisyaratan SLIC trunk Pengisyaratan Switching Element Controller can be : Sentralized Distributed at signaling and switcing Device SLIC : Subscriber Line Interface Circuit To/from other CO Central Office

13 Switching System Step By Step, Each digit activates directly one switching-level, except the last 2 digit usually connected to 2- dimension switch Call Finder Switch level 1 Switch level 2 Switch level 3 Switch level 4

14 Illustration of Call Switching

15 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.

16 Caller lift handset / off hook CO find the available link Get a link CO send dial-tone to caller Caller dial the destination number Switching Process of Telephone Call Yes No

17 CO make switching process Is dialed number free (not busy) ? CO send: Ringing signal to dialed phone Ringing tone to caller phone (tuut – tuut…..) CO send busy tone to caller phone Call drop Called phone Off hook Call success yesno yes No

18 Voice Signaling

19 CO Private Branch eXchange Common Subscriber PBX 90XXXX m ext-link Operator n main link

20 PBX is categorized: PMBX private manual branch exchange Both intern and extern call is handled by an operator PABX-private automatic branch exchange Intern call is automatic Extern call Automatic if the device has DID (direct inward dialing) Via operator If device does not have DID If n >1 (link between co-pbx) User call via one number if PABX has hunting system User can call via n different number if PABX doesnt have hunting system. Advantage of PBX Cost Probability of success call

21 Numbering System Open System Close System

22 Network from CO to Subscriber LE - MDF CCP 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

23 Network Between LE LE Toll Central Toll Central Toll Central Regional Central LE Toll Central Toll Central Toll Central Regional Central yk1 yk2yk3 One local area


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