Re:3. Wireless opperation explained for owners

[-pull@shoot]

On Wed, 04 May 2005 09:03:16 +0200, -pull@shoot wrote:

>
>Lets look a little to the Wireless Alarm System communication
>principles and see how they are "obliged" to operate.
>
>I will explain here "data collisions" Radio Frequency Interferences
>(RFI) and more by making a reduced and SIMPLE ANALOGY between the
>wirelesses "BURST" transmission principle and an example using private
>car parking slots.
>
>Note:  Find between brackets the related items of the wireless
>       data handling technique.
>
>- In a parking lot there are several locations available but
>  each one slot is assigned for a certain purpose, car, van..
>  (radio frequency spectrum assignment by FCC++);
>
>- One or several parking slots are assigned, some are larger but
>  still made available in an economical justified available
>  space, there is a large number of requests and only limited
>  space avail in the parking lot (frequencies are more and
>  more crowded, request for large space is limited and defined
>  by the nature of the requested space, TV for example);
>
>- In order to extend (+/-) the assigned parking slot handling
>  capacity, the parking slot is shared by several owners of that slot.
>  They can be shared only and when each car is present during a
>  limited time span (RF burst communication) and none is occupying
>  it continuously (audio RF transmitter).
>
>- When two or more car's try to park at random time on the
>  same parking slot and the parking slot occupation is not planed
>  (asynchronous RF transmission), there are parking slot occupation
>  collisions.
>  Each party has to wait that the parking slot is free by trying
>  to get access at it later on when there is no longer somebody having
>  access to that slot (free time between transmission bursts).
>
>- Parking slot's can minimize interference due to access
>  collision problems by narrowing car size (RF receiver bandwidth).
>  Lets assume that the assigned parking slot can handle and hold
>  two "small" cars beside each other, the possible interference
>  between car's is reduced by that figure.
>
>- A car parked in the middle of a dual parking slot jeopardizes,
>  even with a small car the parking slot multi handling capacity
>  (RF transmitter not tuned precisely).
>
>- Parking slot collisions can be reduced if parking slot size
>  increases (wide RF band allocation and frequency occupation
>   synchronized, not allowed for wireless alarms by FCC).
>
>I'll stop here this simplified analogy.
>I hope this help to understand the RF data communication technology
>used in wireless alarm systems, called burst transmission (only
>scratched).
>
>NOTE:
>"So called pro's" in that wireless alarm business obviously don't
>possess the meager intellectual capacity required to understand the
>simplistic concepts of what I write.
> Don't overestimate theyre talent to judge others either.
>
>
>
>Paul