7 diagrams to understand PON & bandwidth evolution better

Technology evolution of FTTx

Figure 1. P2P: Point-to-point network

FTTH P2P(point to point) Fiber Solution

FTTH P2P(point to point) Fiber Solution

Features: N fibers, and 2*N transceivers
Pro: Mature technologies, High security, easy for deployment.
Con: Occupies more fibers than PON

  Summary, FTTx P2P technoloy is suitable for business users who require high security and dedicated bandwidth.

Figure 2. P2MP: PON, Passive optical network

FTTH P2MP_PON fiber solution

FTTH P2MP_PON fiber solution

Features: 1 fiber, and N transceivers
Pro: Can not avoid “Rogue” ONT, ralatively low security
Con: Reduces fiber occupation

  Summary, FTTx P2MP technoloy is suitable for residential users, the most popular solution for FTTH.

Figure 3. What is PON?

GEPON OLT, ONU, ODN in FTTH application

GEPON OLT, ONU, ODN in FTTH application

PON: Passive Optical Network

OLT: Optical Line Terminal
ONU: Optical Network Unit
ODN (Optical Distribution Network) items: Passive Optical equipment, like cable, connectors and splitters etc.

  PON is a kind of Point to Multi-point network (P2MP); PON is short for Passive Optical Network; PON consist of OLT, ONU and Passive Optical Equipment.

Figure 4. Technical Principle of TDM-PON

Technical Principle of TDM-PON

Technical Principle of TDM-PON

  Downstream direction: Time Division Multiplexing (TDM)

Figure 5. Flexible DBA bandwidth Guarantee Mechanism

Flexible DBA bandwidth Guarantee Mechanism

Flexible DBA bandwidth Guarantee Mechanism

  Adopt different bandwidth controls to different service stream, including fixed bandwidth, guaranteed bandwidth, guaranteed/non-guaranteed bandwidth, best-effor forwarding, and mixed method.

  The minimum bandwidth granularity of DBA is 64K.

Figure 6. EPON vs GPON Layers

EPON vs GPON Layers

EPON vs GPON Layers

Figure 7. Technical Specifications Comparison Table (PON Protocols)

PerformanceGPONEPON
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
1250
Line CodingNRZ(Non-return-to-Zero)
8B/10B
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)

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