Re: IP cameras on ring topology, not star

[Matt Ion <soundy@xxxxxxxxxxxxxxx>]

Nomen Nescio wrote:
> Pat Coghlan said:
>
>
>>I'm looking for information on equipment that can/should be used to
>>install IP video cameras on poles around a perimeter (1-2 km, or more).
>>
>>Token-ring routers typically require all drops to be plugged into a
>>panel (operates in token ring fashion, but physically is a star), which
>>is not practical with 100 cameras running around a ring, feeding traffic
>>back to recorders.
>>
>>The equipment needs to be economical (hub on each pole).
>
>
> But in a subsequent message, you said:
>
>
>>Cost is not an object.
>
>
>
> Let me start by saying that I am not a data network guru, and some of the
> stuff you are talking about is way beyond my skill level.  However, if cost
> is not an object, there may be an alternative that will do the job for you.
>
> I consider your ring topology to be a very bad idea from an engineering
> standpoint, because a cable fault will wipe out some or all of your
> cameras.  However, if you insist, then perhaps the solution is to think of
> this as a cable television system.
>
> Cable systems, especially fiberoptic systems, routinely carry hundreds of
> television channels on a single backbone.  They can also handle lots of
> cable modems, if two-way data communication  is needed.  For an analog
> video system, RF modulators could place each of your cameras on a different
> channel, and for 1-2 km, coax should be adequate.  I'm guessing something
> comparable would be possible for fiber and/or network cameras, but that is
> beyond my level of expertise.
>
> Just something to consider.

That's a possibility as well, but you'd need a modulator for each
camera, each putting signal on a different channel.  The "cheap" ones
only work on channels 3 and 4; the ones that give you a wider option of
higher channels (like this one:
http://www.rpelectronics.com/English/Content/Items/H541.asp) are more in
the range of $300.  Each.  I guess if cost is no object, the $30,000
worth of modulators is a viable option...


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