DWDM ndi OTN ndi njira ziwiri zaukadaulo zomwe zapangidwa ndi ukadaulo wogawa ma wavelength m'zaka zaposachedwa: DWDM ikhoza kuonedwa ngati PDH yakale (kutumiza kwa mfundo), ndipo ntchito zapaintaneti ndi zakunja zimamalizidwa pa ODF kudzera mu ma hard jumpers; OTN ili ngati SDH (mitundu yosiyanasiyana ya Networking), yokhala ndi ntchito yolumikizirana (kaya ndi kulumikizana kwa gawo lamagetsi kapena gawo la kuwala).
Ndi kufulumizitsa kosalekeza kwa njira ya ALL IP, pakadali pano, mosasamala kanthu za msana wa dziko, msana wa chigawo kapena makina am'deralo a WDM, OTN ndiye chinthu chofunikira kwambiri posankha zida mu gawo loyambirira la kupanga netiweki. Zipangizo za OTN pang'onopang'ono zasintha zida za DWDM ndi zabwino zake zapadera (Mofanana ndi zida za SDH zomwe zimalowa m'malo mwa zida za PDH). Monga ukadaulo watsopano ndi mtundu watsopano wazinthu, OTN yakhala chinthu chofunikira kwambiri pamakampani omwe alipo. Nkhaniyi isanthula ndikuyerekeza zida za DWDM, OTN ndi ukadaulo.
1 Malingaliro oyambira a DWDM ndi OTN
Ndi kusintha kwa zofunikira pa ntchito ndi kuchuluka kwa zinthu, ndikofunikira kuchulukitsa ntchito zazikulu pogwiritsa ntchito ulusi wa kuwala (ulusi umodzi kapena ulusi wapawiri) kenako kuzigawa m'magawo osiyanasiyana a mafunde kuti zitumizidwe kutali. Ukadaulo wochulukitsa mafunde umaonekera malinga ndi nthawi yomwe ikufunikira.
DWDM ndi kugawa kwa mafunde osiyanasiyana (Wavelength Division Multiplexing), komwe kumagawa ma signal a kuwala a mafunde osiyanasiyana kukhala ulusi womwewo kuti atumize uthenga. Ukadaulo wa WDM ndi ukadaulo wachikhalidwe wogawa mafunde womwe wakhala ukula kwa zaka zoposa khumi. Ukhoza kugawidwa m'magawo awiri: kugawa kwa mafunde ochepa (CWDM), ndi nthawi yayikulu (20nm); kugawa kwa mafunde ochuluka (DWDM), ndi nthawi yaying'ono (yochepera kapena yofanana ndi 0.8nm). Chifukwa cha mtunda waufupi wa kugawa uthenga wa CWDM, zida zambiri za DWDM zimayikidwa m'maukonde ogawa mauthenga omwe alipo a ogwiritsa ntchito osiyanasiyana.
Dongosolo lotseguka la DWDM lili ndi magawo otsatirawa: OTM imamaliza kutsitsa ndi kutsitsa ntchito ya siteshoni ya terminal ya mzere wa optical, OA imamaliza kukonza kwa pure optical relay amplification ya chizindikiro cha multiplexed cha siteshoni ya optical line amplifier, ndipo OTU imamaliza kuwala kwa chizindikiro cha wavelength komwe sikokhazikika kuti kukwaniritse ntchito ya kusintha kwa wavelength ya G.694.1(2) ya kuwala kwa wavelength ya muyezo, OMU/ODU: imamaliza multiplexing/demultiplexing ya kuwala kwa wavelength yokhazikika ya G.694.1(2), OBA (power amplifier) imawongolera mphamvu ya chizindikiro chophatikizana cha optical powonjezera , motero imawonjezera mphamvu ya optical yotulutsa ya wavelength iliyonse, ndipo OPA (pre-amplification) imawongolera kukhudzidwa kwa wavelength iliyonse powonjezera mphamvu ya optical ya chizindikiro cha multiplexed cholowetsa.
OTN ndi Optical Transport Network (Optical Transport Network), yomwe imadziwikanso kuti OTH (Optical Transport Hierarchy) mu ITU-T. Idapangidwa potengera kugawa kwa mafunde achikhalidwe ndipo idaphatikiza zabwino za DWDM ndi SDH. Imagwirizanitsa zabwino za optical domain ndi processing yamagetsi, imapereka mphamvu yayikulu yotumizira mauthenga, kulumikizana kowonekera bwino kwa mafunde/mafunde apansi panthaka komanso chitetezo cha carrier-level, ndipo ndi ukadaulo wabwino kwambiri wotumizira mautumiki akuluakulu a broadband. M'zaka zisanu zapitazi, ogwiritsa ntchito agwiritsa ntchito zida za OTN pamlingo waukulu m'maukonde osiyanasiyana otumizira mauthenga.
2 Kuyerekeza makhalidwe aukadaulo a DWDM ndi OTN
Ngakhale kuti dongosolo la DWDM limathandizira kwambiri kufalitsa bwino kwa ulusi wa kuwala ndikuthandizira kufalitsa kwa ntchito zazikulu, chifukwa cha kuchepa kwa ukadaulo wogawa mafunde, mafunde amakonzedwa mu mawonekedwe a point-to-point ndipo sangasinthidwe mosinthasintha. Kuchuluka kwa kagwiritsidwe ntchito ka zinthu sikokwera, ndipo kusinthasintha kwa kusintha kwa ntchito sikukwanira. Kayendedwe ka bizinesi kasintha, ndipo n'kovuta kwambiri kusintha. Ndondomeko pakati pa ntchito za DWDM makamaka ndi nthawi yeniyeni pa ODF. Kasamalidwe ka netiweki kamangoyang'anira magwiridwe antchito a gawo la kuwala (ma byte oyang'anira netiweki ndi ochepa ndipo zambiri zoyang'anira netiweki ndizosavuta), ndipo pali njira zochepa zothetsera mavuto komanso zovuta kwambiri zosamalira.
OTN imalandira ntchito yotumizira ma DWDM yokhala ndi mphamvu zambiri ndipo ili ndi kuthekera kosinthasintha kokonza ma optoelectronic joint ndi chitetezo. Kudzera mu kuyambitsa ukadaulo wa ROADM, ukadaulo wa OTH, G.709 encapsulation ndi control plane, imathetsa vuto la ma network achikhalidwe a WDM opanda kuthekera kokonza ma wavelength/sub-wavelength service. , Kufooka kwa networking, mphamvu yofooka yoteteza ndi mavuto ena. Gawo lamagetsi limagwiritsa ntchito scheduling kutengera ma sub-wavelengths (monga GE, 2.5G, 10G, 40G, 100G particles), ndipo scheduling ya optical layer imadalira kwambiri ma wavelengths a 10G, 40G kapena 100G, ndi kugwiritsa ntchito bandwidth yayikulu; ili ndi ma overhead byte ambiri, ndipo ntchito yake ya OAM The /P ndi yamphamvu kuposa WDM.
Kuphatikiza apo, OTN ndi DWDM zitha kugwiritsidwa ntchito mofanana pa layer ya kuwala, kusiyana kwake ndikuti OTN ili ndi subframe ya layer yamagetsi. Chifukwa chake, zida zina za DWDM pa netiweki yomwe ilipo zimawonjezedwa ndi ma sub-frames amagetsi olumikizirana ndipo zimasinthidwa kukhala OTN.
3 Kuyerekeza kwa DWDM ndi OTN networking
Kulumikizana kosakanikirana kwa OTN ndi DWDM kudzataya ubwino wa OTN (kapangidwe ka chimango ndi kosiyana ndi WDM yachikhalidwe, ndipo kulumikizanako kudzakhala ndi zotsatira).
Popeza OTN optical cross-connect imagwiritsidwa ntchito makamaka ndi ROADM module (yodzaza ndi WSS switch), poganizira mtengo wokwera wa ROADM, OM/OD ndi OADM zimagwiritsidwa ntchito kupanga ring network ndi chain network mu OTN networking.
Pa maukonde olumikizidwa ndi unyolo (monga mizere yayitali ya trunk), ubwino wa OTN sumawonekera mokwanira chifukwa cha mautumiki apakati okhazikika komanso njira zotetezera, koma palinso zabwino zina (kugwiritsa ntchito bwino njira zambiri kumabweretsa ndalama zochepa kuposa WDM yachikhalidwe), netiweki ya trunk yomwe ilipo imagwiritsa ntchito kwambiri DWDM ndi OTN pa network yolumikizidwa.
Pa netiweki yakomweko, popeza mautumiki amafunika kulumikizidwa pafupipafupi, kapangidwe ka netiweki kamasintha nthawi zambiri komanso nthawi yoikidwiratu, ndipo njira yotetezera iyenera kusinthidwa mosavuta, WDM yachikhalidwe iyenera kukhala yosatha kutero. Ubwino wogwiritsa ntchito netiweki ya OTN ndi wodziwikiratu.
OTN imapereka mphamvu yowongolera kutalika kwa mafunde pa ulusi uliwonse, ndipo OTN imatha kusintha bwino kuti igwirizane ndi chitukuko cha netiweki mtsogolo.
4 Kuyerekeza kwa DWDM ndi OTN Bearer Services
Kufunika kwa OTN electrical crossover kumachokera ku kubuka kwa single-wave 10G rate. Pamene channel ifika pa 10G, OTU yake imatha kunyamula 4 * 2.5G kapena 8 mpaka 9 GEs; DWDM imagwiritsa ntchito njira yolunjika mpaka pa mfundo. Ngati kufunikira kwa ntchito kuli kochepa, ndalama za OTU zikuwoneka kuti ndizowononga. Pachifukwa ichi, ndikofunikira kuyambitsa ntchito yolumikizirana yofanana ndi SDH pa DWDM, kuti pakhale ntchito yolumikizirana yamagetsi ya OTN.
OTN ili ndi mphamvu yamagetsi yolumikizirana, kutanthauza kuti, mphamvu ya sub-rate crossover pa njira iliyonse (monga SDH). Nthawi yomweyo, kulumikizana kwa optical cross-connection ndi kulumikizana kwamagetsi sizimasiyana. Ngati pali mphamvu ya optical cross-connection koma palibe kulumikizana kwamagetsi, kapena kulumikizana kwamagetsi popanda kulumikizana kwa optical cross-connection, ikhoza kutchedwa OTN.
Chifukwa cha kusiyana kwa mitundu yomangira maukonde (mtengo, tinthu tautumiki ndi njira yoyendera), njira yamagetsi yolumikizirana imagwiritsidwa ntchito kwambiri ku China, ndipo njira yamagetsi yolumikizirana imagwiritsidwa ntchito kwambiri kunja.
5 Mapeto
Kudzera mu kusanthula ndi kuyerekeza komwe kwatchulidwa pamwambapa, zitha kuwoneka kuti OTN ndi DWDM ndi zosiyana kwambiri pankhani ya ukadaulo ndi kagwiritsidwe ntchito. Kuchokera pakuwona mphamvu yolumikizirana, kuchuluka kwa ntchito ndi kusinthasintha kwa maukonde, OTN ndi yamphamvu kwambiri ndipo ingakwaniritse bwino zosowa za kulumikizanana kwa maukonde mtsogolo.
Chifukwa cha kuwonekera bwino kwa ntchito yotumizira mauthenga a OTN, kuthekera kokonza zolakwika mwamphamvu, kuthekera kosinthasintha kwa nthawi yogwiritsira ntchito makina owonera/magetsi, kuthekera kosamalira bwino komanso kuthekera kwa kukula kwa mphamvu ya zida (zida za 80 * 100G tsopano zagulitsidwa), maukonde osiyanasiyana otumizira mauthenga Kuyambitsidwa kwa zida za OTN kwakhala kosapeweka.
Nthawi yotumizira: Okutobala-25-2022