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| Re: Canarsie CBTC (99826) | |||
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Re: Canarsie CBTC |
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Posted by tracksionmotor on Thu Jun 16 23:48:22 2005, in response to Re: Canarsie CBTC, posted by Stephen Bauman on Thu Jun 16 09:44:50 2005. I am well aware of what spread spectrum is having worked in the pioneering fields. Spread spectrum is multifold based upon software...it can simply spread out data comm to prevent intrusion or it can seek out unoccupied channels and packet reflect in the event of interference like TOR. My concern is of receiver swamping...it doesn't have to be intentional jamming. Yes, 802.11 users are happyusers BUT my experience tells me railcomm needs guarded channels. Frankly, 802.11 is part 15 hobbyists. When it comes to safety sensitive control systems...gimme the twisted pair anytime. Placing RF taggers of 802.11 on boxcars is OK...using it for NYCCBTA is another matter. I've worked the HF systems...Sun...transceivers scan and tweek HF spectrum 24/7 so when user picks up telephone handset the link and viable unoccupied frequencies have already been set up. Trust a trainset to do this reliably for control systems? Go ask Santa Claus!!! CI peter |
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