Ntchito ya optical receiver ndi kusamutsa chizindikiro kuchokera pa optical medium kupita ku magetsi. Mwachidule chake, izi zitha kuchitika pogwiritsa ntchito chipangizo chopanda pake, chokopa ndi kuphweka kwake:
Komabe, chozizwitsa cha uinjiniyachi chimapereka magawo azizindikiro apakati: ndi mawonekedwe owoneka bwino a -1 - -2 dBm, zotulutsa sizikwanira mu GOST, ndipo kupitilira chizindikiro kumabweretsa phokoso lalikulu.
Kuti mutsimikizire mtundu wa chizindikiro choperekedwa ndi zomangamanga za FTTB, ndikofunikira kugwiritsa ntchito zida zovuta kwambiri:
Olandila omwe amapezeka mu netiweki yathu: Vector Lambda, Telmor MOB ndi Planar yapakhomo.
Onse amasiyana ndi mchimwene wawo wocheperako m'magawo ovuta kwambiri, omwe amaphatikizapo zosefera ndi zokulitsa, kotero mutha kukhala otsimikiza za chizindikiro chomwe chimafika kwa olembetsa. Tiyeni tiwone bwinobwino iwo:
The Telmor Optical receiver ili ndi gulu mkati lomwe likuwonetsa chithunzi cha block. Chiwembu ichi ndi chofanana ndi OP.
Mulingo wamawonekedwe ofunikira nthawi zambiri umachokera ku -10 mpaka +3 dBm; pakupanga ndi kutumiza, mtengo wokwanira ndi -1 dBm: iyi ndi malire abwino pakuwonongeka kwa mzere wotumizira ndipo, nthawi yomweyo, kutsika kumapanga. Phokoso lochepa panthawi yodutsa zida zamagetsi.
Dera la AGC (AGC) lomwe limapangidwa mu cholandila kuwala limachita zomwezo posintha mulingo wa siginecha yolowera, imasunga zomwe zimatuluka mkati mwa magawo omwe atchulidwa. Izi zikutanthauza kuti ngati pazifukwa zina chizindikiro cha kuwala chimasintha mwadzidzidzi, koma chimakhalabe mumayendedwe a AGC (pafupifupi kuchokera ku 0 mpaka -7 dBm), ndiye kuti wolandirayo amatumiza chizindikiro nthawi zonse ku coaxial network ndi mlingo umene unalipo. kukhazikitsidwa panthawi yopanga. Pazochitika zofunika kwambiri, pali zida zokhala ndi zolowetsa ziwiri zowoneka bwino, zomwe zimayang'aniridwa ndipo zimatha kutsegulidwa pamanja kapena zokha.
Ma OP onse omwe amagwira ntchito amakhala ndi gawo lokulitsa, lomwe limaperekanso kuthekera kowongolera otsetsereka ndi mulingo wa chizindikirocho.
Chelyabinsk OP Planar ili ndi chizindikiro chodziwika bwino cha msinkhu wa chizindikiro cha kuwala, ndipo zoikamo zimachitika m'njira yosavuta: mwa kupotoza ndi kusintha zoyika zomwe zimasintha makhalidwe a amplifier siteji. Chivundikirocho chimakhala ndi magetsi.
Ndipo Vector Lambda OP, yopangidwa mu "technoporn" yojambula, ili ndi mawonekedwe azithunzi ziwiri ndi mabatani atatu okha.
Kuti musiyanitse zabwino ndi zoyipa, OP iyi imawonetsa zinthu zolakwika m'magawo onse, ndikuwonetsa ziro zabwino ndi +1 mu theka la kutalika kwa chinsalu. Pazinthu zazikulu kuposa +1,9 zimangolemba "HI".
Kuwongolera kotereku ndikoyenera kukhazikitsidwa mwachangu patsamba, koma kuti athe kuwunika ndikuwongolera kutali, pafupifupi onse olandila amakhala ndi doko la ethernet. Mawonekedwe a intaneti amakupatsani mwayi wowongolera ndikusintha magawo, ndipo kuvota kwa SNMP kumathandizidwa kuti aphatikizidwe ndi machitidwe owunikira.
Apa tikuwona chithunzi chofanana cha block cha OP, chomwe ndizotheka kusintha magawo a AGC ndi attenuator. Koma kupendekeka kwa OP iyi kumangokhazikitsidwa ndi odumphira pa bolodi ndipo ali ndi malo atatu okhazikika.
Pafupi ndi dera, magawo ofunikira owunikira akuwonetsedwa: milingo yolowera ndi ma siginecha, komanso ma voliyumu omwe amalandilidwa kuchokera kumagetsi omangidwa. 99% ya kulephera kwa ma OP otere kumachitika pambuyo poti ma voltages asokonekera, choncho akuyenera kuyang'aniridwa kuti apewe ngozi.
Mawu akuti Transponder apa amatanthauza mawonekedwe a IP ndipo tsamba ili lili ndi zoikamo za adilesi, chigoba ndi chipata - palibe chosangalatsa.
Bonasi: kulandila kwawayilesi pawailesi
Izi sizikukhudzana ndi mutu wa mndandanda, koma ndingolankhula mwachidule za kulandila kwapa TV. Chifukwa chiyani tsopano? Inde, ngati tilingalira maukonde a nyumba yosungiramo nyumba, ndiye kuti zimatengera gwero la chizindikiro mu coaxial kugawa maukonde ngati maukonde adzakhala chingwe kapena padziko lapansi.
Pakalibe kuwala kokhala ndi siginecha ya CATV, cholandila pamlengalenga, mwachitsanzo Terra MA201, chitha kukhazikitsidwa m'malo mwa OP:
Ma antenna angapo (nthawi zambiri atatu) amalumikizidwa ndi madoko olowera a wolandila, iliyonse yomwe imalandila ma frequency ake.