Ukuze kusetshenziswe izinhlelo zokusebenza ze-multimedia kunethiwekhi yokuxhumana ekhona, i-International Telecommunication Union (ITU-T) ithuthukise uchungechunge lwephrothokholi yokuxhumana ye-multimedia ye-H.32x. Okulandelayo incazelo emfushane yezindinganiso eziyinhloko
H.320, indinganiso yokuxhumana kwe-multimedia kusistimu yocingo yevidiyo ye-narrowband kanye netheminali (N-ISDN);
H.321, indinganiso yokuxhumana kwemultimedia ku-B-ISDN;
H.322, izinga lokuxhumana kwe-multimedia ku-LAN eliqinisekiswe yi-QoS;
H.323, indinganiso yokuxhumana kwe-multimedia kunethiwekhi eshintshwayo yephakethe ngaphandle kwesiqinisekiso se-QoS;
H.324, indinganiso yokuxhumana kwemultimedia kumatheminali okuxhumana anesilinganiso esincane sebhithi (PSTN kanye nenethiwekhi engenantambo).
Phakathi kwamazinga angenhla, i-H.323 Standard ichaza inethiwekhi iyona esetshenziswa kakhulu, njenge-Ethernet, ithokheni, i-FDDI, njll.ngenxa yokusetshenziswa kwe-H. 323 izinga ngokwemvelo seliphenduke indawo eshisayo emakethe, ngakho-ke sizogxila ku-H.323.Isincomo se-H.323 sichaza izingxenye ezine eziyinhloko: amatheminali, amasango, isofthiwe yokuphatha isango (eyaziwa nangokuthi abalindisango noma amasango), nokulawula amaphuzu amaningi. amayunithi.
1. Itheminali
Wonke amatheminali kufanele asekele ukuxhumana kwezwi, futhi amandla okuxhumana kwevidiyo nedatha azikhethela. Wonke amatheminali e-H.323 kufanele futhi asekele izinga le-H.245, elilawula ukusetshenziswa kwesiteshi nokusebenza.H.323 icacisa imingcele eyinhloko yekhodekhi yezwi ukuxhumana ngezwi kanje: I-ITU ituse i-voice bandwidth /KHz transmission bit rate /Kb/s Compression algorithm isichasiselo G.711 3.456,64 PCM compression elula, isetshenziswe ku-PSTN G.728 3.416 LD-CELP ikhwalithi yenkulumo njenge-G.711, Nini isetshenziswa ekudluliselweni kwe-bit rate ephansi G.722 7 48,56,64 ADPCM ikhwalithi yenkulumo ingaphezulu kwe-G.711, uma isetshenziswa ekudluliselweni kwe-bitrate ephezulu G.723.1G.723.0 3.4 6.35.3 Ikhwalithi yenkulumo ye-LP-MLQ yamukelekile G. I-.723.1 isebenzisa i-G.729 kunkundla ye-VOIP. Ukubambezeleka kwe-G.729a 3.48CS-ACELP kungaphansi kune-G.723.1, ikhwalithi yezwi ingaphezu kwe-G.723.1.
2. Isango
Lokhu kuyakhethwa kumasistimu e-H.323. Isango lingaguqula izivumelwano, ama-algorithms omsindo nevidiyo wokubhala amakhodi nokulawula amasiginali asetshenziswa amasistimu ahlukene ukuze kuhlangatshezwane namatheminali esistimu. Njenge-PSTN esekelwe ku-H.324 System kanye ne-ISDN esekelwe ku-H.320 System kanye nokuxhumana kwesistimu ye-H.323, kuyadingeka ukuze ulungiselele isango.
3. Umgcini-sango
Lena ingxenye yokuzithandela yesistimu ye-H.323 ephethwe isofthiwe. Inemisebenzi emibili eyinhloko: eyodwa ukuphatha izinhlelo zokusebenza ze-H.323; Okwesibili ukuphatha ukuxhumana okungapheli ngesango, njengokusungulwa kwezingcingo, ukudilizwa, njll. Umlawuli angakwazi ukuhumusha ikheli, ukulawula umkhawulokudonsa, ukufakazela ubuqiniso bekholi, irekhodi lokushaya, ukubhaliswa komsebenzisi, ukuphathwa kwesizinda sokuxhumana neminye imisebenzi ngoMgcini-sango.An Isizinda sokuxhumana se-H.323 singaba namasango amaningi, kodwa isango elilodwa kuphela elingasebenza.
4. Iyunithi yokulawula amaphuzu amaningi
I-MCU isebenzisa ukuxhumana kwamaphuzu amaningi kunethiwekhi ye-IP, ukuxhumana kwephuzu kuya kwephuzu akudingeki. Yakha uhlelo lonke lube i-topology yenkanyezi nge-MCU. I-MCU iqukethe izingxenye ezimbili eziyinhloko: isilawuli se-multipoint MC kanye ne-multipoint processor MP, noma ngaphandle kwe-MP. I-MC icubungula ulwazi lokulawula lwe-H.245 phakathi kwamatheminali, isungula igama elincane elivamile lokucubungula umsindo nevidiyo. I-MC ayicubunguli ngokuqondile noma yikuphi ukusakazwa kolwazi lwemidiya, kodwa ikushiyela ku-MP. I-MP ixuba, ishintshe, futhi icubungule umsindo, ividiyo, noma ulwazi lwedatha.
Kunezakhiwo ezimbili ezifanayo zefoni ye-IP embonini, eyodwa iyiphrothokholi ye-ITU-TH.323 eyethulwe ngenhla, enye iphrothokholi ye-SIP (RFC2543) ehlongozwe yi-IETF, iphrothokholi ye-SIP ifaneleka kakhulu itheminali ehlakaniphile.
Amaphuzu okusebenza kwesoftware angenhla angezakwethuI-ONUuchungechunge lwemikhiqizo yenethiwekhi ebhizinisini lesofthiwe, kanye nenethiwekhi efanele ethengisa imikhiqizo eshisayo yenkampani yethu ihlanganisa izinhlobo ezahlukene zeI-ONUuchungechunge , kuhlanganise ne-ACI-ONU/ ukuxhumanaI-ONU/ ehlakaniphileI-ONU/ ibhokisiI-ONU/ izimbobo ezimbili ze-PONI-ONU, njll. Konke okungenhlaI-ONUimikhiqizo yochungechunge ingasetshenziselwa izidingo zenethiwekhi zesigcawu ngasinye. Siyakwamukela ukuze ube nokuqonda okuningiliziwe kobuchwepheshe komkhiqizo.
