Jack Unger wrote: >I predict that Mesh Networks will find (after several deployments) >that the actual throughputs through 3 mesh nodes will be significantly less >than the throughput over a well designed single hop (pt-multipoint) >network.
Your calculations are fine but don't agree with the test cases Mesh says they have run. As I wrote earlier, I am not here to endorse or promote Mesh, but I did want to correct some apparent misunderstandings. They should be invited to make a presentation to the group. They do use two types of radio, a proprietary one called QDMA and 802.11b. They say they could extend the technology to 802.11[ag] easily, given a customer. Obviously, only the 802.11b products are compatible with off- the-shelf consumer products. I can't find any literature on their tests. However, I recall them saying they had set-up about 27 nodes linearly with about half-mile spacing along a straight rural Florida road, and were able to get decent through- put along the entire chain. Don't trust my memory for the exact numbers. Two issues with your calculations. One, if the point-to-point connection has a weak signal (because of the distance), its speed will be much below each link of the relay approach. Two, 802.11b actually uses three channels, not one, so some degree of collision avoidance is possible. 802.11[ag] use more channels. -- Dave Close, Compata, Costa Mesa CA "You ain't goin' nowhere, son." [EMAIL PROTECTED], +1 714 434 7359 -- Grand Ole Opry manager to [EMAIL PROTECTED] Elvis Presley, 1954
