Istorijat razvoja telefonije i IP telefonije. Mr Nenad Krajnović (deo slajdova) Materijal za kurs firme Cisco Systems
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1 Istorijat razvoja telefonije i IP telefonije Mr Nenad Krajnović (deo slajdova) Materijal za kurs firme Cisco Systems
2 Traditional Telephony 2
3 Basic Components of a Telephony Network 3
4 Central Office Switches 4
5 What Is a PBX? 5
6 Primer privatne TF centrale (PBX)
7 Primer privatne TF centrale (PBX)
8 Basic Call Setup 8
9 Supervisory Signaling 9
10 Address Signaling Tone telephone DTMF dialing Rotary telephone Pulse dialing 10
11 Informational Signaling 11
12 Digital vs. Analog Connections 12
13 Time-Division Multiplexing 13
14 Frequency-Division Multiplexing 14
15 Analog Voice Basics 15
16 Local Loops 16
17 Types of Local-Loop Signaling Supervisory signaling Address signaling Informational Signaling 17
18 On Hook 18
19 Off Hook 19
20 Ringing 20
21 Ringing (Cont.) 21
22 Pulse Dialing 22
23 Dual Tone Multifrequency 23
24 Informational Signaling with Call-Progress Indicators 24
25 Trunks 25
26 Foreign Exchange Trunks Foreign Exchange Office Connects directly to office equipment Used to extend connections to another location Foreign Exchange Station Connects directly to station equipment (phone device) Used to provision local service 26
27 Types of Trunk Signaling Loop start Ground start E&M Wink Start E&M immediate start E&M delay start 27
28 Loop-Start Signaling 28
29 Ground-Start Signaling 29
30 E&M Signaling Separate signaling leads for each direction E-lead (inbound direction) M-lead (outbound direction) Allows independent signaling 30
31 E&M Type I 31
32 E&M Type V 32
33 E&M Type II 33
34 E&M Type III 34
35 E&M Type IV 35
36 Trunk Supervisory Signaling Wink Start 36
37 Trunk Supervisory Signaling Immediate Start 37
38 Trunk Supervisory Signaling Delay Start 38
39 2-Wire to 4-Wire Conversion and Echo Echo is due to a reflection. Impedance mismatch at the 2-wire to 4-wire hybrid is the most common reason for echo. 39
40 Echo Is Always Present Echo as a problem is a function of the echo delay and the loudness of the echo. 40
41 Echo Suppression 41
42 Echo Cancellation 42
43 Kako je nastao VoIP... PSTN LAN/WAN
44 ...Internet se veoma brzo širi... PSTN LAN/WAN
45 Umesto pojma podaci kroz telefonsku mrežu PSTN
46 ...pojavio se pojam govorni signali kroz IP mrežu : Internet/Intranet
47 ... javlja se nova ideja... PSTN LAN/WAN VoIP
48 Promena rute... PBX GW T1,E1 PSTN PBX GW AS5300 WAN (Intranet/Internet) Branch Office Main Office GW- gateway
49 Osnovni ciljevi: dodati mogućnost telefonskog poziva (prenos govora i signalizacije) IP mrežama; povezati IP sa javnim (PSTN) i privatnim telefonskim mrežama; održati kvalitet i funkcionalnosti koje već postoje u telefoniji.
50 Faktori koji utiču na usvajanje IP telefonije bandwidth usage; service reliability; network reliability; network performance; voice quality; interoperability; user acceptance; data; network and services management; scalability
51 Razvoj VoIP-a komercijalna upotreba IP telefonije traje od (tada je VocalTec,Inc. objavio svoj Internet Phone softver); počinje realizacija ideje o zameni (ili bar unapređenju) tradicionalne telefonije novim servisima koje bi IP mreža mogla da podrži; IP telefonija se posle nekoliko godina istraživanja i testiranja, nalazi pred ulaskom u široku upotrebu kako kod biznis korisnika tako i kod telekom operatora za potrebe svih korisnika tržište za VoIP aplikacije i uređaje je uspostavljeno, i postoji velika potreba za novim proizvodima...
52 Doprinosi VoIP tehnologije... uz brz i širok razvoj nove tehnologije ide i sumnjau kvalitet; uprkos tome, može se lako reći da VoIP tehnologija izrazito doprinosi: smanjenju troškova (PSTN=>Internet); jednostavnosti (razvija se integralna mreža koja će podržati sve oblike komunikacija); združivanju (upravljanje se vrši na nivou jedne jedine mreže); razvoju novih aplikacija (osim osnovnih aplikacija (telefonije i faksimila), ide se ka razvoju multimedije).
53 Primeri VoIP aplikacija: PSTN/IP gateways; IP telefoni; međukancelarijsko povezivanje preko korporacijske mreže (konferencijska veza); udaljeni pristup korporacijskoj mreži (od kuće); telefonski pozivi sa mobilnog PC-a putem Interneta; intertaktivna kupovina (Web stranice sa linkom click to talk ) govorna pošta...
54 Istorijat razvoja telefonije i IP telefonije Mr Nenad Krajnović (deo slajdova) Materijal za kurs firme Cisco Systems
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