Qhov ciam teb ntawm qhov nruab nrab ntawm qhov nruab nrab thiab cov coaxial cable yog cov khoom siv kho qhov muag. Hauv tsab xov xwm no peb yuav saib lawv cov qauv tsim thiab kev teeb tsa.
Cov ntsiab lus ntawm cov kab lus
- Ntu 7: Optical receivers
- Part 8: Optical backbone network
- Ntu 9: Headend
- Ntu 10: Kev daws teeb meem ntawm CATV network
Lub luag haujlwm ntawm optical receiver yog hloov lub teeb liab los ntawm qhov nruab nrab kho qhov muag mus rau ib qho hluav taws xob. Hauv nws daim ntawv yooj yim tshaj plaws, qhov no tuaj yeem ua tiav siv cov khoom siv passive, ntxim nyiam nrog nws txoj kev yooj yim:
Txawm li cas los xij, qhov txuj ci tseem ceeb ntawm engineering no muab cov teeb liab nruab nrab tsis zoo: nrog rau theem teeb pom kev kho qhov muag ntawm -1 - -2 dBm, cov khoom tso tawm tsis tshua haum rau GOST, thiab overestimating lub teeb liab ua rau muaj suab nrov nrov.
Txhawm rau kom paub tseeb qhov zoo ntawm cov teeb liab xa nrog FTTB architecture, nws yog ib qho tsim nyog yuav tsum siv cov khoom siv ntau dua:
Cov neeg txais tau pom hauv peb lub network: Vector Lambda, Telmor MOB thiab domestic Planar.
Lawv txhua tus sib txawv ntawm lawv cov kwv tij uas tsis muaj zog nyob rau hauv ntau lub voj voog, uas suav nrog cov ntxaij lim dej thiab cov khoom siv hluav taws xob, yog li koj tuaj yeem ntseeg siab txog cov teeb liab mus txog cov neeg siv khoom. Cia peb saib lawv zoo dua:
Telmor optical receiver muaj lub vaj huam sib luag sab hauv uas qhia txog daim duab thaiv. Cov txheej txheem no yog ib txwm rau OP.
Qhov yuav tsum tau kho qhov muag teeb liab theem feem ntau yog los ntawm -10 mus rau +3 dBm; thaum lub sij hawm tsim thiab commissioning, qhov zoo tshaj tus nqi yog -1 dBm: qhov no yog ib tug dlej margin nyob rau hauv cov ntaub ntawv ntawm kis kab mob degradation thiab, nyob rau tib lub sij hawm, theem qis tsim tsawg suab nrov thaum lub sij hawm dhau ntawm cov khoom siv circuits.
Lub AGC Circuit Court (AGC) ua rau hauv lub optical receiver ua li ntawd los ntawm kev kho cov theem ntawm cov input teeb liab, nws khaws cov zis ib tug nyob rau hauv cov kev txwv tsis pub. Qhov no txhais tau hais tias yog vim li cas cov teeb liab kho qhov muag dheev hloov pauv loj, tab sis tseem nyob hauv kev ua haujlwm ntawm AGC (kwv yees li ntawm 0 txog -7 dBm), tom qab ntawd tus txais yuav tsis tu ncua xa cov teeb liab mus rau coaxial network nrog qib uas yog. teeb thaum teeb tsa. Rau qhov tshwj xeeb tseem ceeb, muaj cov khoom siv nrog ob qhov khoom siv kho qhov muag, txhua tus tau saib xyuas thiab tuaj yeem qhib tau los ntawm manually lossis txiav.
Tag nrho cov nquag OPs muaj cov theem amplification, uas tseem muab lub peev xwm los tswj txoj kab nqes thiab theem ntawm cov teeb liab tso zis.
Optical Receiver Control
Txhawm rau teeb tsa cov teeb liab tsis, nrog rau kev hloov pauv thiab tswj kev ua haujlwm hauv kev pabcuam, kev tswj tau yooj yim feem ntau muaj nyob rau hauv cov neeg txais lawv tus kheej. MOB tau pom hauv daim duab saum toj no muaj lub rooj tsav xwm cais, uas yog xaiv tau rau hauv rooj plaub. Tsis tas li ntawd, raws li lwm txoj hauv kev, nws tau thov kom siv lub rooj tsav xwm tawm sai, uas tsuas yog ntsia thaum teeb tsa hauv cov chaw nres nkoj ntawm lub rooj tsav xwm loj. Hauv kev xyaum, qhov no tsis yooj yim heev, tau kawg.
Lub vaj huam sib luag tswj tso cai rau koj los teeb tsa qhov tseem ceeb ntawm cov input attenuator (nce uas cov teeb liab tso zis tsawg zuj zus raws li qhov nce), qhib lossis tawm (nrog rau cov nqi ruaj khov) AGC, teeb tsa qaij qhov ntsuas thiab teeb tsa lub ethernet interface .
Chelyabinsk OP Planar muaj qhov taw qhia meej ntawm cov teeb liab kho qhov muag, thiab kev teeb tsa tau ua tiav hauv txoj kev yooj yim: los ntawm kev sib tw thiab hloov cov ntxig ntxig uas hloov cov yam ntxwv ntawm theem amplifier. Lub hau hinged muaj lub zog siv.
Thiab Vector Lambda OP, ua nyob rau hauv "technoporn" tsim, muaj ob tug lej npo thiab tsuas yog peb lub nyees khawm.
Txhawm rau paub qhov txawv qhov zoo ntawm qhov tsis zoo, qhov OP no qhia cov txiaj ntsig tsis zoo hauv txhua ntu, thiab qhia qhov zoo xoom thiab +1 hauv ib nrab ntawm qhov screen qhov siab. Rau cov nqi ntau dua +1,9 nws tsuas yog sau "HI".
Cov kev tswj hwm zoo li no yooj yim rau kev teeb tsa sai ntawm qhov chaw, tab sis rau qhov muaj peev xwm ntawm kev saib xyuas thiab tswj cov chaw taws teeb, yuav luag txhua tus neeg txais xov tooj muaj qhov chaw nres nkoj ethernet. Lub vev xaib cuam tshuam tso cai rau koj los tswj thiab hloov qhov tsis sib xws, thiab SNMP kev xaiv tsa tau txais kev txhawb nqa rau kev koom ua ke nrog kev saib xyuas.
Ntawm no peb pom tib daim duab thaiv ntawm ib qho OP, uas nws muaj peev xwm hloov tau qhov tsis sib xws ntawm AGC thiab attenuator. Tab sis qhov qaij ntawm OP no tsuas yog tsim los ntawm jumpers ntawm lub rooj tsavxwm thiab muaj peb txoj haujlwm ruaj khov.
Tom ntej no mus rau lub voj voog, qhov tseem ceeb tsis zoo rau kev soj ntsuam tau tshwm sim: theem ntawm cov tswv yim thiab cov zis tawm tswv yim, nrog rau cov nqi hluav taws xob tau txais los ntawm cov khoom siv hluav taws xob. 99% ntawm kev ua tsis tiav ntawm OPs tshwm sim tom qab cov hluav taws xob tsis zoo, yog li lawv yuav tsum tau saib xyuas kom tsis txhob muaj xwm txheej.
Lo lus Transponder ntawm no txhais tau hais tias tus IP interface thiab lub tab no muaj cov chaw nyob, daim npog qhov ncauj thiab lub rooj vag - tsis muaj dab tsi nthuav.
Nyiaj tshwj xeeb: txais tos hauv huab cua hauv TV
Qhov no tsis yog hais txog lub ntsiab lus ntawm koob, tab sis kuv tsuas yog luv luv tham txog kev txais tos hauv TV. Vim li cas tam sim no? Yog lawm, tsuas yog peb xav txog lub network ntawm ib lub tsev tsev, ces nws nyob ntawm qhov chaw ntawm lub teeb liab nyob rau hauv lub coaxial tis network seb lub network yuav cable los yog terrestrial.
Thaum tsis muaj fiber ntau kho qhov muag nrog lub teeb liab CATV, lub xov tooj cua tshaj tawm, piv txwv li Terra MA201, tuaj yeem ntsia tsis yog OP:
Ob peb lub kav hlau txais xov (feem ntau yog peb) txuas nrog cov chaw nres nkoj ntawm lub receiver, txhua tus uas muab kev txais tos ntawm nws tus kheej ntau zaus.
Π‘ΠΎΠ±ΡΡΠ²Π΅Π½Π½ΠΎ, Ρ ΠΏΠ΅ΡΠ΅Ρ
ΠΎΠ΄ΠΎΠΌ Π½Π° ΡΠΈΡΡΠΎΠ²ΠΎΠ΅ ΡΠ΅Π»Π΅Π²Π΅ΡΠ°Π½ΠΈΠ΅ Π² ΡΡΠΎΠΌ ΠΎΡΠΏΠ°Π΄Π°Π΅Ρ Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΠΎΡΡΡ, ΡΠ°ΠΊ ΠΊΠ°ΠΊ ΡΠΈΡΡΠΎΠ²ΡΠ΅ ΠΌΡΠ»ΡΡΠΈΠΏΠ»Π΅ΠΊΡΡ Π²Π΅ΡΠ°ΡΡΡΡ Π² ΠΎΠ΄Π½ΠΎΠΌ Π΄ΠΈΠ°ΠΏΠ°Π·ΠΎΠ½Π΅.
Rau txhua tus kav hlau txais xov, koj tuaj yeem kho qhov rhiab heev kom txo cov suab nrov, thiab, yog tias tsim nyog, muab cov chaw taws teeb rau lub amplifier ua rau hauv lub kav hlau txais xov. Lub teeb liab ces hla dhau theem amplifier thiab yog summed. Lub peev xwm los kho cov qib tso zis yog txo kom tig tawm cov theem cascade, thiab kev kho qhov qaij tsis yog muab rau txhua qhov: koj tuaj yeem tau txais cov duab uas xav tau los ntawm kev kho qhov rhiab heev ntawm txhua tus kav hlau txais xov. Thiab yog hais tias tom qab xws li ib tug receiver muaj kilometers ntawm coaxial cable, ces lub attenuation nyob rau hauv nws yog combated los ntawm kev txhim kho thiab configuring amplifiers, tib yam li nyob rau hauv lub cable network.
Yog tias xav tau, koj tuaj yeem muab cov teeb liab sib txuas: sau ob qho tib si cable thiab terrestrial, thiab tib lub sijhawm satellite teeb liab rau hauv ib lub network. Qhov no yog ua tiav los ntawm kev siv ntau qhov hloov pauv - cov khoom siv uas tso cai rau koj los sau thiab faib cov cim los ntawm ntau qhov chaw.
Tau qhov twg los: www.hab.com