Pofuna kukhazikitsa ma multimedia pamaneti omwe alipo, bungwe la International Telecommunication Union (ITU-T) lapanga mndandanda wa H.32x multimedia communication protocol series. Zotsatirazi ndizofotokozera mwachidule za miyezo yayikulu
H.320, muyezo wa matumizidwe ophatikizika amawu, nyimbo ndi zithunzi kulankhulana pa narrowband kanema telefoni dongosolo ndi terminal (N-ISDN);
H.321, muyezo wa matumizidwe ophatikizika amawu, nyimbo ndi zithunzi kulankhulana pa B-ISDN;
H.322, muyeso wolumikizana ndi ma multimedia pa LAN wotsimikiziridwa ndi QoS;
H.323, muyezo wolumikizirana ndi ma multimedia pa netiweki yosinthira paketi popanda chitsimikizo cha QoS;
H.324, muyezo wolumikizirana ndi ma multimedia pamayendedwe otsika kwambiri (PSTN ndi netiweki opanda zingwe).
Pakati pa zomwe zili pamwambazi, H.323 Standard imatanthawuza maukonde omwe amagwiritsidwa ntchito kwambiri, monga Efaneti, chizindikiro, FDDI, etc.chifukwa cha kugwiritsa ntchito H. 323 standard mwachilengedwe yakhala malo otentha pamsika, kotero tiyang'ana kwambiri pa H.323.Lingaliro la H.323 limatanthawuza zigawo zinayi zazikulu: ma terminals, zipata, mapulogalamu oyang'anira zipata (omwe amadziwikanso kuti alonda a zipata kapena zipata), ndi ma multipoint control. mayunitsi.
1. Pokwerera
Materminal onse ayenera kuthandizira kulankhulana ndi mawu, ndipo mphamvu zoyankhulirana za vidiyo ndi deta ndizosankha. Materminal onse a H.323 ayeneranso kuthandizira mulingo wa H.245, womwe umayang'anira kagwiritsidwe ntchito ka tchanelo ndi magwiridwe antchito.H.323 imatchula magawo akulu a codec ya mawu mu kulankhulana ndi mawu motere: ITU inalimbikitsa mawu a bandiwifi /KHz transmission bit rate /Kb/s Compression algorithm annotation G.711 3.456,64 PCM compression yosavuta, yogwiritsidwa ntchito ku PSTN G.728 3.416 LD-CELP khalidwe la kulankhula ngati G.711, Pamene kugwiritsidwa ntchito pa kufala kwa kalankhulidwe ka G.722 7 48,56,64 ADPCM ndikokwera kuposa G.711, kukagwiritsidwa ntchito pa kufala kwa G.723.1G.723.0 3.4 6.35.3 Kulankhula kwa LP-MLQ ndikovomerezeka G. .723.1 imagwiritsa ntchito G.729 pabwalo la VOIP. Kuchedwa kwa G.729a 3.48CS-ACELP ndikotsika kuposa G.723.1, khalidwe la mawu ndilokwera kuposa G.723.1.
2, Gateway
Izi ndizosankha pamakina a H.323. Khomo limatha kusintha ma protocol, ma audio ndi makanema ojambula ma aligorivimu ndikuwongolera ma siginecha omwe amagwiritsidwa ntchito ndi machitidwe osiyanasiyana kuti athe kulumikizana ndi ma terminals. Monga PSTN yochokera ku H.324 System ndi narrowband ISDN yochokera ku H.320 System ndi H.323 Kuyankhulana kwadongosolo, ndikofunikira kukonza chipata.
3. Mlonda wa pakhomo
Ichi ndi gawo losankha la dongosolo la H.323 lomwe limayendetsedwa ndi mapulogalamu. Ili ndi ntchito ziwiri zazikulu: imodzi ndikuwongolera mapulogalamu a H.323; Chachiwiri ndi kasamalidwe ka kuyankhulana kotsiriza kudzera pachipata, monga kukhazikitsidwa kwa foni, kuchotsedwa, ndi zina zotero. Woyang'anira akhoza kumasulira adiresi, kuwongolera kwa bandwidth, kutsimikizira kuyimba, kuyimba foni, kulembetsa kwa ogwiritsa ntchito, kasamalidwe ka madera olankhulana ndi ntchito zina kudzera mwa Gatekeeper.An H.323 kulankhulana ankalamulira akhoza kukhala angapo zipata, koma chipata chimodzi chokha ntchito.
4. Multipoint control unit
MCU imagwiritsa ntchito kuyankhulana kwamitundu yambiri pa intaneti ya IP, kuyankhulana kwa mfundo ndi mfundo sikofunikira. Pangani dongosolo lonse kukhala topology ya nyenyezi kudzera mu MCU. MCU ili ndi zigawo ziwiri zazikulu: multipoint controller MC ndi multipoint processor MP, kapena opanda MP. MC imayendetsa zidziwitso za H.245 pakati pa ma terminals, kukhazikitsa dzina lochepera lodziwika bwino pakukonza ma audio ndi makanema. MC simakonza mwachindunji zidziwitso zilizonse zapa media, koma zimasiya kwa MP. MP imasakaniza, kusintha, ndikusintha ma audio, kanema, kapena zambiri za data.
Pali zomangamanga ziwiri zofanana za foni ya IP m'makampani, imodzi ndi ITU-TH.323 protocol yomwe inayambitsidwa pamwambapa, ina ndi SIP protocol (RFC2543) yoperekedwa ndi IETF, SIP protocol ndiyoyenera kwambiri kwa otsiriza anzeru.
The pamwamba mapulogalamu ntchito mfundo ndi zathuONUmndandanda mankhwala maukonde mu malonda mapulogalamu, ndi maukonde zogwirizana otentha kugulitsa mankhwala a kampani yathu kuphimba zosiyanasiyana zaONUmndandanda, kuphatikizapo ACONU/ kulumikizanaONU/ wanzeruONU/ bokosiONU/ madoko awiri a PONONU, etc. Zonse pamwambapaONUmankhwala angapo angagwiritsidwe ntchito pa netiweki zofunika pa chochitika chilichonse. Takulandilani kuti mukhale ndi chidziwitso chaukadaulo chamankhwala.
