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Using 802.11 in an FTTP Application

Using 802.11 in an FTTP Application. FTTP Application. FTTP with 802.11. Issues to Consider. Equipment Availability Security Bandwidth Propagation distances Quality of Service. Service Offerings. Data Services 5Mbps downstream / 2Mbps upstream 15Mbps downstream / 2 Mbps upstream

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Using 802.11 in an FTTP Application

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  1. Using 802.11 in an FTTP Application

  2. FTTP Application

  3. FTTP with 802.11

  4. Issues to Consider • Equipment Availability • Security • Bandwidth • Propagation distances • Quality of Service

  5. Service Offerings • Data Services • 5Mbps downstream / 2Mbps upstream • 15Mbps downstream / 2 Mbps upstream • 30 Mbps downstream / 5 Mbps upstream • Video Services • Today optical wavelength overlay • Future – IP TV • 3-4 Mbps per channel • 19 Mbps per channel (high definition) • Telephony Service • 4 voice channels (analog today) • VOIP – 100Kbps per voice channel

  6. 802.11 Data Rates

  7. Quality Of Service • Voice and video data have QOS requirements • Data services can be supported using DCF • Consider using PCF • Enhanced QOS mechanisms are specified in 802.11e

  8. Point Coordination Function • ONT could be used as Point Coordinator • ONT polls phones for voice traffic • ONT can “pace” the downstream video traffic • No control over upstream data packet size • If VOIP packet size could be set, then PCF may achieve QOS • Better alternatives available from 802.11e

  9. 802.11e QOS Methods

  10. 802.11e Traffic Priorities • 8 traffic priorities are used from 802.1d • Background (1) • Background (2) • Best Effort (0) • Best Effort (3) • Video (4) • Video (5) • Voice (6) • Voice (7) • These are mapped to 4 Access Categories • Voice • Video • Best Effort • Background

  11. Arbitration Inter Frame Space

  12. HCCA • QOS equivalent to PCF • Allows for contention period and contention free period • Polling in contention free period include QOS details • Allows HC to fairly allocate medium considering QOS • Contention period uses EDCA

  13. Results from Simulation DCF vs EDCA

  14. Conclusions • 802.11 could be used to deliver current FTTP services • 802.11e can provide QOS • No growth path for HD TV • Not useful for MDU application • IP phones currently too expensive • Security can be managed with pre-shared keys • Unlikely to become a common ONT interface

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