Passive Optical Broadband Communications in Local Access Network Kae-hsiang Kwong 21 January 2004

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Presentation transcript:

Passive Optical Broadband Communications in Local Access Network Kae-hsiang Kwong 21 January 2004

What is an Access Network? Access Networks provide necessary interfaces to end-users accessing telecommunication services. Access unit Access Network Feeder + Distribution Backbone Network Internet PSTN CATV Backbone Network Internet PSTN CATV

Evolution of Access Networks Telephony Cable TVInternet Telephony + Internet Cable TV + Internet Telephony + Cable TV + Internet

Passive Optical Access Networks PON: network architecture constructed solely using passive optical devices; no signal regeneration in the transmission path. ONU users Combiner Copper networkOptical fibre network Backbone network PSTN CATV Internet Backbone network PSTN CATV Internet OLT Backbone network

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 Control ONU 1 ONU 2 ONU x users Combiner OLT ONU 1ONU 2ONU 3 GGG Grant is broadcast to every ONU. Information is carried to OLT at the end of each ONU transmission.

WDM IPACT + DiffServ Classifier Packets from users Class 1 Class 2 Class 3 scheduler ONU OLT DS Network 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 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.