Difference between GPON and EPON (ii)

Difference between GPON and EPON (ii)

PON Protocols

  There are several PON protocols and standards defined by the ITU organisation with varying levels of maturity. The three main ones which are BPON, EPON and GPON.

PON Protocols Difference

PON Protocols Introduction


  This are two striking superstar PON standards in our FTTH solution area, one is Gigabit PON (GPON) standard formulated from the ITU/FSAN, and the other is Ethernet PON (EPON) standards developed by the IEEE 802.3ah working group.

  Like the super heroes in the Hollywood movies, EPON and GPON FTTH solution,who led the tide of broadband access and optical telecom application,becoming the new hot spot.

EPON vs GPON Layers

EPON vs GPON Layers

EPON vs GPON Layers 

Technical Specifications Comparison Table

StandardITU.T G.984.1/2/3/4IEEE 802.3h
Downstream Rate(Mbit/s)1244/24881250
Upstream Rate(Mbit/s) 155/622/1 244/2 488
Line CodingNRZ(Non-return-to-Zero)
Speed Rate2.488G/1.244G1.25G/1.25G
Splitter Ratio1:64~1:1281:16~1:32
Bearer NetworkATM, Ethernet, TDMEthernet
Bandwidth Efficiency92%72%
QOSVery good,including Ethernet, TDM, ATMGood, only ethernet
Optical BudgetClass A/B/CPx10/Px20
RangingEqualization Delay(EqD)Round Trip Delay(RTD)
DBAStandard FormatManufacturer Customize
TDM SupportTDM over Ethernet,(PWE3, CESoEthernet)or native TDM)TDM over Ethernet,(PWE3, CESoEthernet)
ONT InteroperabilityOMCINull
OAMITU-T G.984 (Strong)Ethernet OAM,SNMP Option(weak)

APPENDIX:Related Protocol Standards Groups

ITU-T G.984.1

  • GPON Network Parameter Description
  • Protection switching network requirements

ITU-T G.984.2

  • PMD layer specifications
  • 2.488Gbps downstream optical interface parameter specifications
  • 1.244Gbps upstream optical interface parameter specifications
  • Physical layer overhead allocation

ITU-T G.984.3

  • GPON TC layer specification
  • GTC multiplexing structure and protocol stack introduction
  • GTC frame structure introduced
  • ONU registration activation process
  • DBA specifications
  • Alarms and performance

ITU-T G.984.4

  • OMCI message structure described 
  • OMCI Device Management Framework 
  • OMCI implementation principles outlined

IEEE 802.3ah-2004
  Ethernet in the First Mile
IEEE 802.3-2008
  A revision of base standard incorporating the 802.3an/ap/aq/as amendments, two corrigenda and errata. Link aggregation was moved to 802.1AX.

Ask for FTTH Catalogue & PON Solution!

Latest Blog

About Us

Why FTTH can save telecom cost

FTTH: saving money

【Our Goal】

Benefits our customers via Fiber Network (FTTH).

【FOT Telecom】

Your reliable fiber network equipment and service provider: Read More

Contact us

Email: sales@fiberoptictel.com Skype: fanny-lee2007Tel: +86-20-2209 8370
Add.:97th Science Avenue, Science Town,  Guangzhou, Guangdong, China