星期日, 2月 26, 2006

802.11

802.11 Metropolitan Wireless Business Models
  • Taipei Model
  • Bay Area Model
  • Philadelphia Model

802.11 Protocol
  • 802.11b/a/g/n
  • 802.11 MAC (pp. 2-88~2-107)
  • 802.11 PCF & DCF
    802.11 RTS & CTS
    802.11 QoS
  • animations (two Applets about CSMA/CA Simulations)

Industry & Products
張貼者： 於

2 則留言:

Yao Jen 提到...

brand: Wi-Fly
subscription: flat rate, monthly charge, 399/mo
applications: access
management: gov outsourced to a private company

utility: water, power, local phone company (wire)

週六 12月 22, 04:27:00 下午 GMT+8
Yao Jen 提到...

Google
operator: Google , Earthlink
subscription: free access, ad

FON
AP manufactured by Accton at Taiwan
subscription: free access, AP accessible to others

Taipei
outsourced ISP

Philadelphia
gov-owned ISP

Wi-Fi is contention-based, non FCFS
voice needs constant bit rate
Ethereal, Skype packet, silence suppression, 37% talk spurts, 63% silent

Quality of Service, QoS
delay
<100 ms excellent
150-250 acceptable
>250 ms unacceptable

jitter
variance between packets

IEEE 802.11e

AP to AP

deassociation, reassociation 50ms
Application layer delay> 5sec

週六 12月 22, 04:27:00 下午 GMT+8

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