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>>> Bottleneck 802.11 or USB <<<

 
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raouf is offline Old Post 06-13-2004 09:42 AM
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Bottleneck 802.11 or USB

Consider the following facts:
Ethernet (wired) maximm throughput is 10 Mbps (Megabits per second)
FastEthernet (wired) maximum throughput is 100 Mbps
802.11b maximum throughput is negotiated based on the capabilities of both ends and on the number of transmission errors, the following are the possible negotiated rates: 1, 2, 5.5 and 11 Mbps
802.11g supports in addition the following rates 18, 24, 36, 48, 54 Mpbs
USB1.1 maximum throughput is 12 Mpbs
USB 2.0 maximum throughput is 480 Mbps
Also notice that errors on Ethernet are very rare, on USB less rare but very unlikely in the case of a single USB device on the port such as the case of Tivo.
Errors on a wireless link are very common (they are caused by wireless handsets, microware ovens as well as other 802.11 devices) the rates of 11 Mbps and 54 Mbps are never realized under realistic condition.
Consider yourself lucky if you get half the maximum rate. Most 802.11b users get effectively 2-3 Mbps.

If you have wireless or Ethernet, that is definitely the bottleneck.
If you have FastEthernet, then the USB is the bottleneck.

The question is now what is the rate that Tivo needs to function smoothly.
If you are streaming music like MP3 then you need .128 Mpbs
Does anyone know what are the rates for the various Tivo video settings such as: Highest Quality, Medium Quality, etc... ?

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>>> Bottleneck 802.11 or USB <<<

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