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Advances in Optical Access Networks -- tek_kddi_OFC_v04_slides

APON

EPON

GPON

BPON

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2005 OFC 講義資 Advances in Optical Access Networks

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Advances in Optical

Access Networks

Teknovus, Inc.

KDDI R&D Labs, Inc.

Glen Kramer,

Keiji Tanaka,

Outline

 Evolution of the first mile

 Flavors of PON: APON/BPON, GPON, EPON

 Services

 Open issues in EPON

- One or multiple logical links per ONU?

-Downstream DBA

- Open access

- Variable capacity and CO-wide fairness

- Upgradeability

Evolution of the First Mile

Point-to-point links

– N fiber lines

– 2N transceivers

Concentration switch

in the neighborhood

+ 1 fiber line

– Power in the field

– 2N + 2 transceivers

PON – a distributed

switch

+ 1 fiber line

+ N + 1 transceivers

+ Path transparency

Curb switch

subscribers

L km

Passive

optical

splitter

N subscribers

PON Architecture

• All transmissions are performed between

Optical Line Terminal (OLT) located in CO and

Optical Network Units (ONUs).

• ONUs are granted time-shared

access to the medium.

Flavors of PON

• APON/BPON: ATM/Broadband PON (ITU-T G.983)

– Uses ATM as bearer protocol

– Developed in FSAN

– Standardized in 1998-2003

• GPON: Gigabit-Capable PON (ITU-T G.984)

– Based on Generic Framing Procedure (G.7041)

– Developed in FSAN

– Standardized in 2003-2004

• EPON: Ethernet PON (IEEE 802.3ah-2004)

– Uses Ethernet and Multi-Point Control Protocol

– Developed by IEEE

– Standardized in June 2004

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