E le ho kenya ts'ebetsong lits'ebetso tsa multimedia marang-rang a teng a puisano, Mokhatlo oa Machaba oa Mehala (ITU-T) o hlahisitse letoto la protocol ea puisano ea multimedia ea H.32x. Se latelang ke tlhaloso e khutšoanyane ea litekanyetso tse ka sehloohong
H.320, tekanyetso ea puisano ea multimedia ho narrowband video phone system le terminal (N-ISDN);
H.321, tekanyetso ea puisano ea multimedia ho B-ISDN;
H.322, tekanyetso ea puisano ea multimedia ho LAN e tiisitsoeng ke QoS;
H.323, e tloaelehileng bakeng sa puisano ea multimedia ho marang-rang a pakete e se nang tiiso ea QoS;
H.324, tekanyetso ea puisano ea multimedia ho li-terminals tsa puisano tse tlaase tsa bitrate (PSTN le marang-rang a se nang mohala).
Har'a litekanyetso tse ka holimo, H.323 Standard e hlalosa marang-rang a sebelisoang ka ho fetisisa, joalo ka Ethernet, token, FDDI, joalo-joalo ka lebaka la ts'ebeliso eaH. 323 standard ka tlhaho e fetohile sebaka se chesang 'marakeng, kahoo re tla tsepamisa maikutlo ho H.323.Tlhahiso ea H.323 e hlalosa likarolo tse' nè tse kholo: li-terminals, li-gateways, software ea tsamaiso ea liheke (eo hape e tsejoang e le balebeli ba liheke kapa liheke), le taolo ea lintlha tse ngata. diyuniti.
1, Terminal
Litheminale kaofela li tlameha ho ts'ehetsa puisano ea lentsoe, 'me matla a khokahanyo ea video le data ke a boikhethelo.Litheminale kaofela tsa H.323 li tlameha ho ts'ehetsa maemo a H.245, a laolang tšebeliso le tšebetso ea kanale.H.323 e totobatsa lintlha tse kholo tsa codec ea lentsoe ho puisano ea lentsoe ka tsela e latelang: ITU e khothalelitse lentsoe bandwidth /KHz transmission bit rate /Kb/s Compression algorithm annotation G.711 3.456,64 PCM compression e bonolo, e sebelisoang ho PSTN G.728 3.416 LD-CELP boleng ba puo e le G.711, Ha sebelisoa ho low bit rate transmission G.722 7 48,56,64 ADPCM speech quality is above G.711, ha e sebelisoa ho high bit rate transmission G.723.1G.723.0 3.4 6.35.3 LP-MLQ language quality is acceptable G. .723.1 e sebelisa G.729 bakeng sa foramo ea VOIP. G.729a 3.48CS-ACELP e lieha ho feta G.723.1, boleng ba lentsoe bo phahame ho feta G.723.1.
2, Gateway
Sena ke khetho bakeng sa litsamaiso tsa H.323. Heke e ka fetola liprothokholo, li-algorithms tsa li-audio le tsa video le matšoao a taolo a sebelisoang ke litsamaiso tse fapaneng ho amohela puisano ea liteishene tsa sistimi. Joalo ka ha PSTN e thehiloeng ho H.324 System le narrowband ISDN e thehiloeng H.320 System le H.323 Tsamaiso ea puisano, hoa hlokahala ho lokisa tsela ea heke.
3. Molebeli oa menyako
Ena ke karolo ea boikhethelo ea sistimi ea H.323 e laoloang ke software. E na le mesebetsi e 'meli e meholo: e' ngoe ke ho laola lits'ebetso tsa H.323; Ea bobeli ke tsamaiso ea puisano ea li-terminal ka heke, joalo ka ho theha mohala, ho qhaqha, joalo-joalo Mookameli a ka etsa phetolelo ea aterese, taolo ea bandwidth, netefatso ea mohala, rekoto ea mohala, ngoliso ea basebelisi, taolo ea domain name le mesebetsi e meng ka Gatekeeper.An Sebaka sa puisano sa H.323 se ka ba le liheke tse ngata, empa ke tsela e le 'ngoe feela e ka sebetsang.
4. Multipoint control unit
MCU e sebelisa puisano ea lintlha tse ngata ho marang-rang a IP, puisano ea ntlha-to-point ha e hlokehe. Theha sistimi eohle hore e be topology ea linaleli ka MCU. MCU e na le likarolo tse peli tsa mantlha: multipoint controller MC le multipoint processor MP, kapa ntle le MP. MC e sebetsana le tlhahisoleseding ea taolo ea H.245 pakeng tsa li-terminals, ho theha lebitso le fokolang le tloaelehileng bakeng sa ts'ebetso ea molumo le video. MC ha e sebetse ka kotloloho phallo efe kapa efe ea litaba tsa media, empa e e tlohella MP. MP e kopanya, ea chencha, 'me e sebetsana le litaba tsa molumo, video kapa data.
Ho na le meralo e 'meli e ts'oanang ea meralo ea mohala oa IP indastering, e' ngoe ke protocol ea ITU-TH.323 e hlahisitsoeng kaholimo, e 'ngoe ke SIP protocol (RFC2543) e hlahisitsoeng ke IETF, protocol ea SIP e loketse ho feta terminal e bohlale.
Lintlha tse ka holimo tsa ts'ebetso ea software ke tsa ronaONUletoto la lihlahisoa tsa marang-rang khoebong ea software, le marang-rang a amehang a rekisoang lihlahisoa tsa khampani ea rona a koahela mefuta e sa tšoaneng eaONUseries , ho akarelletsa le ACONU/ puisanoONU/ bohlaleONU/ lebokoseONU/ likou tse peli tsa PONONU, etc. Tsohle tse ka holimoONUlihlahisoa tsa letoto li ka sebelisoa bakeng sa litlhoko tsa marang-rang tsa ketsahalo ka 'ngoe. Rea u amohela ho ba le kutloisiso e qaqileng ea tekheniki ea sehlahisoa.
