Kuyamba kwa ukadaulo wa Pam4

Musanamvetsetse ukadaulo wa PEM4, kodi ukadaulo wosinthasintha ndi chiyani? Kusintha kwa ukadaulo wamanja ndi njira yosinthira zikwangwani za baseband (zikwangwani zamagetsi) muzolowera. Pofuna kuonetsetsa kuti kulumikizana ndi kuthana ndi vuto lakutali, ndikofunikira kusamutsa mawonekedwe a siginecha kwa njira yayitali kwambiri pakusinthana.

Pam4 ndi lamulo lachinayi limatulutsa kusinthasintha kwa kusintha kwa kusintha (Pam) njira yosinthira.

Pam siginal ndiukadaulo wofala pambuyo pake pambuyo pa NRZ (osabwerera zero).

Chizindikiro cha NRZ chikugwiritsa ntchito milingo iwiri, yotsika komanso yotsika, kuyimira chizindikiro chimodzi cha digito, ndipo imatha kufalitsa chizindikiro chimodzi cha digito, ndipo imatha kufalitsa chizindikiro 1

Pam4 signal imagwiritsa ntchito magawo anayi a siginelo kuti mutumizidwe, ndipo wotchi iliyonse imatha kufalitsa zigawo ziwiri za mfundo zomveka, zomwe ndi 00, 10, 10, 10, ndi 11.
Chifukwa chake, pansi pautope womwewo, pang'ono pang'ono za PER4 siginecha ya NRZ siginecha ya NRZ, yomwe imawonjezera kuchuluka kwa kufalitsa ndalama komanso kumachepetsa mtengo.

Tekinoloji ya Pam4 yagwiritsidwa ntchito kwambiri m'munda wamtunda wothamanga kwambiri. Pakadali pano, pali 400G ma transceal transceiver pozaza ukadaulo wa Pam4 posinthana ndi ma center a data ndi 50g Optical Transceiver Technology ya Pam4 yochokera pa intaneti ya 5g.

Njira yokhazikika ya 400g dml ma tragencrencrenc transceiver yosinthira pamphumu ya Pampo ili motere: potumiza zizindikilo za magetsi 25g. Zizindikiro zothamanga kwambiri zimasinthidwa kukhala zikwangwani za 50gbps zapamwamba kwambiri kudzera m'mabuku 8 a Lasers, kuphatikiza ndi gawo limodzi la 100G High-Sturction Optical Off Manning. Mukalandira zizindikiro, zomwe adalandira 100G Speal-Speal-Speal amalowerera ndi zizindikiro za ma 8-chanch 50gbps Pambuyo pochira koloko, kufupika, kufanana, ndi Pam4 kuwononga chip Chip, chizindikiro chamagetsi chimasinthidwa kukhala 16G siginecha ya 25g yamagetsi.

Ikani ukadaulo wama Pam4 kusinthidwe ku ma module a 400gb. Gawo la 400gb / S moducation potengera kusintha kwa Pam4 kumatha kuchepetsa kuchuluka kwa ma laser kumapeto kwa olandila pomaliza chifukwa chogwiritsa ntchito kusintha kwa zinthu zakale poyerekeza ndi NRZ. Pampotion imachepetsa kuchuluka kwa mitengo yowoneka bwino mu gawo lamiyebwa, lomwe limatha kubweretsa zabwino monga msonkhano wotsika, ndi kukula kwamphamvu.

Pali kufunikira kwa ma module a 50Gbib / o kufalikira kwa ma 5g

Mukamafotokoza za ma Pam-4, ndikofunikira kulabadira kusiyana pakati pa mulingo wa Baud ndi mtengo wake. Kwa zizindikiro zachikhalidwe za NRZ, chifukwa chilengezo chimodzi chimabweretsa zochepa, kuchuluka kwake ndi kuchuluka kwa baud ndizofanana. Mwachitsanzo, ku 100g Ethernet Kwa zizindikiro za Pam, popeza chilengezo chimodzi chimabweretsa zifanizo 2 za deta, mtengo womwe ungafanane ndi kuchuluka kawiri pa diaud. Mwachitsanzo, kugwiritsa ntchito njira zinayi za 26.562555gbaud siginesi ku 200g Ethernet, kuchuluka pang'ono pa njira iliyonse ndi 53.12500.125gps iliyonse, ndi njira 4 zamatsenga zitha kukwaniritsa kufalikira kwa 200gbps. Kwa 400g Ethernet, itha kupezeka ndi njira 8 ya 26.5625555gAud.