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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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Presentation Transcript

What is an access network

What is an Access Network? 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 Network

Telephony

Cable TV

Internet

Telephony

+

Internet

Cable TV

+

Internet

Telephony + Cable TV + Internet


Passive optical access networks

Passive Optical Access Networks Network

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 Network

  • 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 Network

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 Network

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 Network

  • 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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