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| Re: Canarsie CBTC/RF (99857) | |||
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Re: Canarsie CBTC/RF |
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Posted by Stephen Bauman on Fri Jun 17 08:35:38 2005, in response to Re: Canarsie CBTC/RF, posted by Jeff H. on Fri Jun 17 02:41:40 2005. He's talking about "front end overloading", a widely-understood problem in RF communications...Obviously you can design around that by using very good shielding, and having large dynamic range in the RF circuits. But it is certainly possible.I'm happy that at least one person with "real world railroading" experience thinks that this might not be an insurmountable problem. I have seen commerical-grade 802.11 systems degrade and even fail to associate with the AP from proximity to strong RF sources, or even a large amount of aggregrate RF energy, e.g. when too many people are running their own private 802.11 networks in close quarters. I should think some form of failure mode analysis would be appropriate here. If the RF sources or aggregate RF energy from many 802.11 users resulted in front end overload, then the suggestions you made above would be appropriate. OTOH, two or more AP's might be using the same seed for DSSS or FHSS and interfering with one another. This is common because most wi-fi users don't bother changing their parameters from the default factory settings. However, this should not be a realistic scenario for a NYCT installation. There just are not that many underground AP's. |
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