N'oge a, na ọrụ nkwukọrịta netwọkụ ugbu a, transceivers optical,ngwa anya eriri transceivers, na modem anya nwere ike ịsị na ndị ọrụ nchekwa na-eji ya eme ihe nke ukwuu ma na-akwanyere ya ugwu.Yabụ, ị maara ọdịiche dị n'etiti atọ a doro anya?
Modem anya bụ ụdị akụrụngwa yiri baseband MODEM (modem dijitalụ).Ihe dị iche na modem baseband bụ na ejikọtara ya na eriri eriri anya raara onwe ya nye, nke bụ akara ngosi anya.
A na-eji ya maka ntughari nke mgbaàmà fotoelectric na interface protocol na netwọk mpaghara sara mbara, na ịnweta rawụta bụ ohere netwọk mpaghara.Onye na-ebugharị fotoelectric na-eji ngbanwe nke mgbaàmà fotoelectric na netwọk mpaghara, ma ọ bụ naanị ntụgharị mgbaàmà, na-enweghị ntụgharị nke protocol interface. A na-ejikarị ya eme ihe maka ogologo oge na netwọk campus na ọ dịghị mma maka gburugburu ebe obibi. A na-etinye eriri ndị gbagọrọ agbagọ.Iji dokwuo anya modem anya, transceiver fotoelectric.Anyị kwesịrị iwebata gburugburu ebe a na-eji ha eme ihe.
Modem ngwa anya, makwaara dị ka transceiver anya otu ọdụ ụgbọ mmiri, bụ ngwaahịa emebere maka gburugburu ndị ọrụ pụrụ iche.Ọ na-eji otu ụzọ eriri anya maka otu E1 ma ọ bụ otu V. 35 ma ọ bụ otu 10BaseT n'ọnụ-na-atụ ngwa ngwa nnyefe ngwa anya.Dị ka akụrụngwa nnyefe nke netwọkụ mpaghara, akụrụngwa a dabara adaba maka akụrụngwa nnyefe ọdụ fiber optic nke ọdụ ọdụ yana akụrụngwa ahịrị mgbazinye.Maka transceivers ngwa anya ọtụtụ ọdụ ụgbọ mmiri, a na-akpọkarị ha “transceivers optical”.Maka ndị transceivers anya otu ọdụ ụgbọ mmiri, a na-ejikarị ha eme ihe n'akụkụ onye ọrụ.Ha na-arụ ọrụ yiri nke modem baseband a na-ejikarị maka ịkparịta ụka n'usoro WAN raara onwe ya nye (circuit)."Optical modem" na "Optical Network Unit".
Ndị transceivers anya bụ naanị ngwaahịa maka nkwukọrịta data.Ngwaahịa transceiver ngwa anya dị iche iche, bara uru maka nnyefe telivishọn USB, ụfọdụ maka nnyefe ekwentị, bara uru maka njikwa ụlọ ọrụ, na ụfọdụ na-ejikọta "olu, data, oyiyi" na ọrụ ndị ọzọ iji nweta One.
The ngwa anya eriri transceiver na-aghọta mgbanwe mgbaama n'etiti otu-mode na multi-mode eriri na gbagọrọ agbagọ ụzọ na Ethernet.The Optical fiber transceiver bụ ihe ntụgharị mgbasa ozi mgbasa ozi Ethernet nke na-agbanwe nrịbama eletriki ụzọ gbagọrọ agbagọ dị mkpụmkpụ na mgbama ngwa anya dị anya.A na-ejikarị transceivers anya na gburugburu netwọkụ ebe enweghị ike ikpuchi eriri Ethernet yana a ga-eji eriri anya mee ihe iji gbasaa anya nnyefe;N'otu oge ahụ, ha na-enyere aka ijikọ maịl ikpeazụ nke ahịrị eriri anya na netwọk mpaghara mepere emepe (nke bụ teknụzụ Ethernet) yana ọkwa elu ndị ọzọ.Ịntanetị ekerekwala òkè dị ukwuu.
Dabere na ọsọ ọsọ, enwere ike kewaa transceiver eriri anya n'ime otu 10M, 100M fiber transceiver,10/100M transceiver optical optical transceiverna 1000M optical fiber transceiver.10M na 100M transceivers na-arụ ọrụ na oyi akwa anụ ahụ, na ngwaahịa transceiver na-arụ ọrụ na oyi akwa a na-ebugharị data bit site na bit.Usoro mbugharị a nwere uru nke ngwa ngwa na-ebuga ngwa ngwa, ọnụ ọgụgụ nghọta dị elu, obere oge, wdg, dị mma na ndakọrịta na nkwụsi ike, ọ dịkwa mma maka iji njikọ ọnụ ọnụ.
Ihe transceiver optical fiber 10/100M na-arụ ọrụ na oyi akwa njikọ data.Na oyi akwa a, transceiver optical fiber transceiver na-eji usoro ụlọ ahịa na-ebugharị iji gụọ adreesị MAC isi ya, adreesị MAC ebe, yana adreesị MAC ebe ọ bụla enwetara.Data, a na-ebufe ngwungwu data ahụ ka emechara nlele mgbapụta cyclic CRC.Nke mbụ, ọ nwere ike igbochi ụfọdụ okpokolo agba na-ezighi ezi ịgbasa na netwọkụ wee were akụrụngwa netwọkụ bara uru.N'otu oge ahụ, ọ nwekwara ike igbochi data ngwugwu ọnwụ n'ihi na netwọk netwọk.
Dị ka ihe owuwu ahụ si dị, enwere ike kewaa ya na ụdị desktọpụ transceiver fiber optical na rack type optical fiber transceiver.Ihe transceiver optical optical desktọpụ kwesịrị ekwesị maka otu onye ọrụ, dị ka izute elu njikọ nke otu mgba ọkụ na corridor.Ndị transceivers fiber optic agbakwunyere rack dabara adaba maka nchịkọta ọtụtụ ndị ọrụ.
Dị ka eriri, ọ nwere ike kewaa multi-mode eriri transceiver na otu-mode eriri transceiver.N'ihi eriri anya dị iche iche ejiri mee ihe, ebe nnyefe nke transceiver dị iche.Ogologo nnyefe izugbe nke transceiver ụdịdị dị iche iche dị n'etiti kilomita 2 na 5 kilomita, ebe transceiver otu ụdị nwere ike kpuchie nso site na kilomita 20 ruo 120.Ekwesịrị ịkọwapụta na n'ihi ọdịiche dị na nnyefe nnyefe, ike na-ebufe, ịnata uche na ogologo ogologo nke transceiver fiber optic n'onwe ya ga-adịkwa iche.Ike nnyefe nke 5km optical fiber transceiver na-adịkarị n'etiti -20 ruo -14db, na nnabata nnabata bụ -30db, na-eji ogologo ogologo nke 1310nm;ebe ike nnyefe nke 120 km optical fiber transceiver na-abụkarị n'etiti -5 ruo 0dB, na nnabata nnabata bụ -38dB, na-eji 1550nm wavelength.
Dị ka ọnụ ọgụgụ nke ngwa anya emep uta eri, ọ nwere ike kewaa otu-fiber optical transceiver nadual-fiber optical transceiver.Otu eriri bụ ịghọta data ịnata na izipu na eriri anya.Ụdị ngwaahịa a na-anabata teknụzụ nkewavelength nkewa multiplexing, na ogologo wavelength ejiri na-abụkarị 1310nm na 1550nm.N'ihi ojiji nkewavelength nkewa multiplexing, otu eriri transceiver ngwaahịa n'ozuzu nwere àgwà nke nnukwu mgbaàmà attenuation.Ka ọ dị ugbu a, ọtụtụ ndị transceivers fiber optic dị n'ahịa bụ ngwaahịa nwere eriri abụọ, nke tozuru oke ma kwụsie ike.
Ọfọn, nke dị n'elu bụ okwu mmeghe banyere ọdịiche dị n'etiti transceiver optical, transceiver fiber optical na modem optical.Enwere m olileanya na ọ ga-enyere gị aka!