MAC Txheej kev ua haujlwm rau hauv onus: ib qho kev sib sib zog nqus dhia
TusMedia nkag mus tswj (Mac) txheejNyob rau hauv ib lub chaw tsim kho kho qhov muag (ONU) yog qhov tseem ceeb heev uas yuav tau kis tau cov ntaub ntawv li cas thiab tau txais dhau ntawm lub passating network network (pon). Nws ua kom muaj txiaj ntsig zoo bandwidth kev faib, kev sib tsoo kev zam, thiab kev pabcuam zoo (qos). Hauv qab no yog cov ncauj lus kom ntxaws tawg ntawm nws cov haujlwm tseem ceeb thiab kev ua haujlwm.
1. Mac Txheej hauv Pon: Txheej txheem cej luam
Lub mac txheej nyob rau hauv ib qho onu kev ua haujlwm nyob hauvOSI Txheej 2 (cov ntaub ntawv txuas txheej txheem)thiab cuam tshuam nrog:
Cov khaubncaws sab saud (LLC, txheej network)Frames Framing, hais txog, thiab ntws tswj.
Lub cev txheej (phy)Tswjhwm optical teeb liab kev teeb tsa thiab demodulation.
Nyob rau hauv aPon ib puag ncig, lub mac txheej yuav tsum ua raws li:
ITU-T G.984 (GPON) / G.9807 (xgs-Pon)tus qauv
Ieee 802.3ah (epon)Rau cov ethernet-raws li pons
2. Cov haujlwm ua haujlwm ntawm Mac txheej hauv onus
①nns dynamic bandwidth faib (DBA)
Vim li cas?Txij li thaum Pon yog aSib koom nruab nrab, tus edt yuav tsum txiav txim siab upstream kis los tiv thaiv kev sib tsoo.
Yuav ua li cas?
Onu xaCov xwm txheej ntas yeej tshaj tawm (BSRS)rau OLT qhia tias muaj queue.
Lub OLT suavKev Sib Kis (Txiaj Ntsig)Kev Siv:
Cov Ntawv Ua Haujlwm Nruab Nrab (LARBA)→ Guaranteed Bandwidth rau T-content (cov thawv xa khoom).
Kev Hloov Kho Cov Ntawv (Dynamic Dynamic)Hloov kho raws li kev tsav tsheb tiag tiag (piv txwv li, tawg paj tawg paj).
Kev xaiv tsa me nyuam:
Cov xwm txheej tshaj tawm (SR) DBA→ Onu Cov Ntawv Qhia Kev Ua Tsis Zoo ntawmPlou (lub cev txheej overhead nce toj saud).
Kev Tswj Xyuas Tsheb (TM) DBAOLT kwv yees kev khiav tsheb tsis muaj kev ceeb toom qhia meej.
② Ntau yam & ncej segmentation
Lub pov haum (GPPPPPPPPPSulation Cov Qauv):
Segments Ethernet / IP pob ntawv rau hauv53-} tete lub pov haum(zoo ib yam li cov roj atm).
Kev sivChaw nres nkoj ID (12- ntsis)Kom paub qhov txawv ntawm cov kev pabcuam (Is Taws Nem, VoIP, IPTV).
T-cart (kis thawv ntim khoom):
Txhua T-cont yog muab ibAlloc-id(Cim cim rau bandwidth cov nyiaj pab).
Txhawb nqa5 QOS tsheb khiav(T-cans hom 1-5):
| Ntaus | Kev tsav tsheb khiav | Siv cov ntaub ntawv |
|---|---|---|
| 1 | Tsau (assured BW) | VoIP, Kev Pab Thaum Muaj Xwm Ceev |
| 2 | Assured + tsis muaj tseeb bw | Yees duab streaming |
| 3 | Kev siv zog zoo tshaj plaws | Web Browsing |
| 4 | Tsis paub meej | Tej Tshuab |
| 5 | Sib xyaw (sib txuas 1-4) | Kev Pabcuam Lag Luam |
③ QOs & Kev Ua Ntej
802.1P muaj feem xaus teev:
Daim duab qhia chaw{{0 {0}} ntsis qhov tseem ceeb code point (PCP)rau T-core queues.
Piv txwv li:
PCP 6-7→ Qhov Tseem Ceeb Tshaj Plaws (VoIP, Kev Ua Si Tiag Tiag)
PCP 0-1Kev Siv Zog Zoo Tshaj (Email, Ntaub Ntawv Downloads)
Teem Sij Hawm Algorithms:
Lub zog nruj ua ntej (SP): Lub neej ua ntej muaj haujlwm ib txwm mus ua ntej.
Qhov hnyav ncaj ncaj ncaj ncaj (WFQ): Sib tw bandwidth ntawm cov kev pabcuam.
④ Kev ruaj ntseg & encryption
AES -128 encryption (G.984.3):
Muaj kev nyab xeeb nce toj / ntws los ntawm ONU thiab OLT.
Qhov tseem ceeb sib pauv ntawmLub cev ce oam (PLOAM) lus.
MAC chaw nyob lim:
Tiv thaiv cov khoom tsis tau tso cai los ntawm kev tso npe nkag rau npe.
⑤ Oam (Cov Haujlwm, Cov Thawj Coj & Txij Nkawm)
Cov lus thov Puab:
LeegOnu ua kom muaj zog, tuag Gasp, thiab Alarms.
Piv txwv cov lus:
Serial _ tus lej _}} Onu (rau kev txheeb xyuas)
Ua _ alloc-id (rau bandwidth txoj haujlwm)
OMCI (ONT tswj & Tswj interface):
Tswj cov kev pab ntau dua-txheej (VOIP, IGMP, thiab lwm yam).
3. Mac Txheej Kev Sib Tw & Kev Txhim Kho
① latency & jitter tswj
Teeb meem: Ntws los yogTdma (lub sijhawm faib ntau qhov kev nkag tau)Kev xaiv tsa.
Lus teb:
Ua ntej DBA: Kev twv cov qauv tsheb khiav kom txo cov nyiaj pab qeeb.
Turst hom kis: Minimizes tus neeg saib xyuas bands ntawm onu kev xa khoom.
Sanderity hauv xgs-pon / ng-pon2
Cov kab qib siab (10G / 25G / 50G):
Yuav tsum tauTsawg-latency mac lub sijhawmlos lis cov nce siab.
Wavelength distic:
Yav tom ntej Onus yuav txhawb nqatunable lasersRau ntau-wavelength.
③ Kev soj ntsuam kev sib cuam tshuam
BBF.247 Daim Ntawv Pov Thawj: Kom muaj ntau tus neeg muag khoom onu-olt compatibility.
Kev Kuaj Txuj Ci: Siv tau Mac tus cwj pwm nyob rau hauv cov nra hnyav.
4. Yav tom ntej cov qauv hauv onu Mac txheej
Ai-tsav DBA: Siv lub tshuab kev kwv yees rau kev tsav tsheb zoo dua.
Kev txiav txim siab kev sib tham (tnet): Guarterees ultra-tsis latency rau 5g backhaul.
MAC Virtualization (VMAC): Huab-based MA ua rau kev hloov pauv Pon kos duab.
Tag
TusMac txheej hauv onusyog tus"Tsheb COP"ntawm Pon Networks, kom ntseeg tau:
✔ Kev sib qhia bandwidth txuag(DBA)
✔ Nruj qos tswj hwm(T-CA ADVITITY)
✔ Kev sib txuas lus ruaj ntseg(AES -128} encryption)
✔ Kev Tswj Xyuas Kom Tau(PLOAM / OMCI)
Nkag siab cov txheej txheem no yog qhov tseem ceeb rau kev ua kom zooFtth kev ua tau zoo, tshwj xeeb yog networks hloov kho50g-pon thiab dhau.
