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nuckollsr(at)cox.net
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Posted: Wed Aug 29, 2007 6:53 pm Post subject: NOT airplane related-digital phone sevice

At 08:09 AM 8/28/2007 -0700, you wrote:



 	  Quote: 	
		  



I would add that the cable based phone service needs local AC power to work.

They usually use a UPS for standby power should the power go out. But this

standby time will be limited by the capacity and condition of the back up.

The old style phone service is not dependant on AC power at the premises.



Bevan

RV7A

wiring


	


    I was curious about that and asked when they installed our

    system. For our provider at least, ALL power is provided by

    the system. If one puts a voltmeter on the center conductor

    of the coax coming into the back of the house, it has about 90

    volts DC on it. I was told that this power is provided NORMALLY

    by the electric power company . . . but here's the interesting

    part. All the little green 'dog-houses' around our neighborhood

    for the cable company also have gas lines going into them. Seems

    there is a small NG powered standby source. The dog-house at

    the corner of my housing development says it's made by Alpha

    and the model number is "CE-SC3".  The electric meter on one

    end shows a peak draw of 1.25 KVA.



    Before this box went in, if there was a sustained power

    outage in the neighborhood, the cable guy would show up

    and plug the box into a little portable Honda putt-putt.

    Now when theres a power outage, he's noticeably absent

    and the phones are still working . . . along with any other

    cable driven appliances that are powered independently

    of the ac mains.



    Bob . . .

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fvalarm(at)rapidnet.net
Guest

Posted: Wed Aug 29, 2007 8:32 pm Post subject: NOT airplane related-digital phone sevice

Yes, Thanks Bob.



I forgot about that.  A friend of mine works for the cable phone company and

had told me some time ago that it's common in larger centers (eastern I

think) that the power comes "down the line" from the cable provider.  We

don't have this technology in our area yet because of the current

infrastructure has to be upgraded, so I think of cable phone as requiring

local power as that's the standard here.  Nothing stays the same anymore?

Did it ever?



Bevan

RV7A 



--

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jetboy

Joined: 22 Jul 2006
Posts: 233

Posted: Wed Aug 29, 2007 9:56 pm Post subject: Re: NOT airplane related-digital phone sevice

Bob,

   would you mind finding a little more about those dog boxes, if they indeed have propane? gas power? Some remote telecommunication sites use such thermo electric generators and I've read that some thermocouples are available to generate from external exhaust heat of road trucks - you know where this is leading - I wouldnt mind attaching one to my aircraft as a backup power source.



Its a little frustrating here in New Zealand there is a manufacturer of stirling engine power generators for boats and homes - called "whispergen" - however they ony seem to supply to certain markets and that doesnt include locally.

Regards, Ralph

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_________________
Ralph - CH701 / 2200a

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