Passive optical broadband communications in local access network
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Passive Optical Broadband Communications in Local Access Network. Kae-hsiang Kwong 21 January 2004 [email protected] What is an Access Network?. Backbone Network Internet PSTN CATV. Access Networks provide necessary interfaces to end-users accessing telecommunication services.

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Passive Optical Broadband Communications in Local Access Network

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Passive optical broadband communications in local access network

Passive Optical Broadband Communications in Local Access Network

Kae-hsiang Kwong

21 January 2004

[email protected]


What is an access network

What is an Access Network?

Backbone Network

Internet

PSTN

CATV

Access Networks provide necessary interfaces to end-users accessing telecommunication services.

Access Network

Feeder

+

Distribution

Access

unit


Evolution of access networks

Evolution of Access Networks

Telephony

Cable TV

Internet

Telephony

+

Internet

Cable TV

+

Internet

Telephony + Cable TV + Internet


Passive optical access networks

Passive Optical Access Networks

PON: network architecture constructed solely using passive optical devices; no signal regeneration in the transmission path.

Backbone network

PSTN

CATV

Internet

ONU

Combiner

OLT

ONU

users

ONU

Backbone network

Copper network

Optical fibre network


Medium access control

Medium Access Control

  • Interleaved Polling with Adaptive Cycle Time (IPACT)

  • Provides Dynamic bandwidth allocation.

  • OLT assigns each ONU for transmission based on the information exchanged between OLT and ONUs.

  • Buffer status and traffic load of ONU sent to OLT.

  • OLT utilises incoming information to schedule ONU transmissions.

  • OLT issues Grants to inform individual ONUs start time and duration of transmission.


Medium access control1

ONU 1

Combiner

OLT

ONU 2

ONU 3

ONU 2

ONU 1

users

ONU x

Medium Access Control

G

G

G

  • Grant is broadcast to every ONU.

  • Information is carried to OLT at the end of each ONU transmission.


Wdm ipact diffserv

WDM IPACT + DiffServ

DS Network

Packets

from

users

Class 1

Classifier

Class 2

scheduler

Class 3

ONU

OLT

  • ONU:

  • Incoming packets are classified and marked.

  • Traffic flows are grouped into traffic classes according to the similarity of QoS requirements.

  • Different level of reservation treatments applied to each traffic class.

  • OLT:

  • Bandwidth are allocated to ONUs according to the buffer status and traffic load.

  • Associates traffic classes to bandwidth allocation schemes.


Conclusion

Conclusion

  • WDM PON systems

    • 1. WDM-IPACT with fixed transceivers.

    • 2. WDM-IPACT with tuneable transmitters, fixed receivers.

  • Highly cost efficient solution in upgrading access network.

  • Single network architecture, supporting Telephony, CATV broadcast, Internet, etc.

  • DS domain extended to local access networks.

  • Achieves end-to-end QoS provisioning.

  • Eliminates the need for per-flow resource reservation.


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