Intshayelelo kwiTekhnoloji yePam4

Ngaphambi kokuqonda itekhnoloji yePam4, yintoni itekhnoloji yemodyuli? Itekhnoloji yemodyuli yindlela yendlela yokuguqula imiqondiso ye-basesebobband (imiqondiso yombane evuthiweyo) kwimiqondiso yothumelo. Ukuqinisekisa ukusebenza ngonxibelelwano kwaye soyise iingxaki kusulelo lomgama omde, kufuneka ukuba kudluliselwe kwi-spectrium yomqondiso we-frequency ngemo yokuhambisa.

I-Pam4 yi-oda yesine ye-oda ye-ample

I-PAM Signal yiTekhnoloji yoThengiso loThengiso loThengiso loThengiso lwe-NRZ (ungabuyanga kwi-zero).

Umqondiso weNRZ usebenzisa amanqanaba amabini eMiqondiso, aphezulu kwaye aphantsi, amele i-1 ne-0 yomqondiso we-digital, kwaye unokudlulisela i-1 bit yolwazi lwe-Logic kumjikelo we-Logic ngamnye.

I-Pam4 Signal isebenzisa amanqanaba ama-4 ahlukeneyo omqondiso wokuhanjiswa kwesiginali, kwaye umjikelo ngamnye we-bit unokudlulisela ulwazi lwe-2 lolwazi lwengcinga, ebizwa ngokuba ngu-00, 01, 10, kunye ne-11.
Ke ngoko, phantsi kwemilinganiselo efanayo ye-baud, ireyithi ye-bit ye-PAM4 iphindwe kabini kwi-NRZ Stor, ephindaphindiweyo ephinda-phinda impumelelo kunye nokunciphisa iindleko.

Itekhnoloji yePam4 isetyenziswe ngokubanzi kwicandelo lokunxibelelana okuphezulu kwesantya esiphezulu. Okwangoku, kukho i-400G yemodyuli ye-tradceiver yemodyuli esekwe kwiTekhnoloji yeNdawo ye-PAM4 yeziko ledatha kunye ne-50g ye-50g ye-50g ye-50g.

Inkqubo yokuphunyezwa kwe-400G DML yemodyuli ye-DestCeical ngokubhekisele kwimo-mveliso yombane ye-PSS, i-DAM4 ye-25G NRS ye-25G NRS, elayishwe kwi-chip yombane. Iimpawu ezihamba ngesantya esiphezulu zombane ziguqulwa zibe ziziindlela ezi-8 ze-50gbps ezihambahamba ezihamba ngesantya esiphezulu nge-8 zeendlela ze-lavers, zidibene ne-Taveger Powner Point Pronel Expanment Expan. Xa ufumana imiqondiso yeyunithi, i-100g ye-100G i-Supelical Speelical igalelo kwiCandelo le-APT, iguqulwe kwi-8-jebbps ye-8-jebbps ephezulu yesantya, ifunyenwe kumqondiso wombane. Emva kokubuyisela umva, i-amunition, ulingano, kunye ne-DEAMOTION ye-DOSP nge-DSP ye-DSP ye-DCS, umqondiso wombane uguqulwe ube yimiqondiso ye-25G NRZ NRZ SING.

Faka isicelo seTekhnoloji yeNdawo yePam4 kwiimodyuli ze-400GB / ze-Shemical. Imodyuli ye-400GB / ye-Supeb / i-Supecal / i-Supeb / i-Podule eyasekeleni esekwe kwimo yokumoda ye-Pam4 inokunciphisa inani leendlela ezifunekayo kwi-odolo yokudlulisela kunye nokunciphisa inani leendlela zokufumana iimo zemo yoku-odola xa kuthelekiswa ne-NRZ. Imodyuli yePam4 inciphisa inani lamacandelo ovavanyo kwimodyuli ye-Optical, enokuzisa izibonelelo ezinje ngeendleko zendibano eziphantsi, ukunciphisa amandla, kunye nobungakanani bepakethi.

Kukho imfuno yeemodyuli ze-50gbibit kwi-5g yothungelwano kunye nenethiwekhi ye-Backshaul, kunye nesisombululo esekwe kwizixhobo ezingama-25g ze-optical kwaye zongezwe yiFomu yePosi yePam4 ye-Ampling I-Ampling I-Ampling I-Ampling ye-Pams

Xa ichaza iimpawu zePam-4, kubalulekile ukuba unikele ingqalelo umahluko phakathi kwenqanaba le-baud kunye nenqanaba le-bit. Imiqondiso yemveli ye-NRZ, kuba isimboli esinye siguqula enye yedatha, ireyithi ye-bit kunye nenqanaba le-baud liyafana. Umzekelo, kwi-100g Ethernet, esebenzisa amane amane angama-25.785gbaud imiqondiso yosulelo, ireyithi ye-bit kwi-25.78155gbps, kunye nemiqondiso emine yokufumana usulelo lwe-100bbbp. Kwiimpawu ze-PAM-4, kuba isimboli esinye sidlulisela ii-bits ezi-2 zedatha, ireyithi ye-bit enokudluliselwa kabini i-bhayithi kabini. Umzekelo, usebenzisa amajelo ama-4.5625gbaud imiqondiso yosulelo kwi-200G Ethernet, ireyithi ye-bit kwi-53.125gbps, kunye neempawu ezi-4 zokufumana usulelo lwe-200. I-400G Ethernet, inokufezekiswa ngeendlela ezingama-26.5625gbaud imiqondiso.