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Re: multiplexed home phone lines and rain problems
From: Laurence C. Brevard (Laurence.Brevard@medispecialty.com)
Tue, 26 Dec 2000 17:50:19 -0600
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At 04:47 PM 12/26/2000 -0600, you wrote: >Agua!
>
>It is likely that water is causing a circuit to complete...sometimes. This
>is why 'call forwarding on busy-no answer' is working.
Uh... that's NOT what I said.
I'm using "remote access to call forwarding" to forward the lines even though I cannot get to them directly (to forward).
But, yes, once the calls are deflected from going to the house, they go elsewhere just fine!
>You complicate the issues by overloading your circuits too.
Gee... you think EIGHT extensions is a bit much! :-)
>Best thing to do is to go to the demark and plug in a pots phone into the
>interface. This will tell you if the problem is on "Your" side or "Their"
>side.
Already done that.
Once it quits working completely unplugging my "mega-load" (octa-load?) from the demark does NOT fix it.
I suppose I could unplug half the phones as we get into wet weather and see if it doesn't quit!
I actually went and unplugged two of the 1.0B ones right now.
>If it is on your side then try unplugging all but one phone on each circuit
>and test it out. You probably have too many connections into each circuit.
See below - definitely the case.
>You can add up the REN values of each device. The REN "ringer equivalency
>number" is marked somewhere on the device or in the doccumentation you have
>(you still have it of course) :-)
Uh... of course!
>The total of all of the RENs on any phone line can not exceed 5.
Actually I thought I did the REN-math already once but...
3 AT&T + 1 Vtech are 0.7B ==> 2.8B 1 Panasonic is 0.2B (yay!) ==> 3B 3 Radio Shack :-( are 1.0B ==> 6B --- OOPS!
>Devices that ring at 20 Hrz will have a suffix of 'A' added to the REN.
>Devices that ring at any frequency will have a suffix of 'B' added to the
>REN....just FYI.
>Many phones are 1 or more so you probably are over the capacity for your
>circuits.
Well obviously at 6B I'm over 5B but not grossly so.
This could easily explain why I'm okay in dry weather but not in wet.
What surprises me is that I've never found a buffer amp / line amplifier from anyone.
It seems like before you get to a full blown PBX box, someone could offer a much simpler box that just allowed you to have lots of extensions. Maybe it would cost as much to make that as a cheap (<$1000) PBX brain so no one makes them.
I'm looking currently at the Centerpoint TalkSwitch as a 4 in x 8 extension switch that uses existing analog phones and even passes the CallerID signals to them.
It's $995 directly from the manufacturer in Ottawa, Canada.
>Typical phone lines have 85 to 105 Volts A.C. superimposed on a nominal -48
>Volts D.C. The A.C. current during the ringing cycle is between 20 and 50
>milliamps, in case you want to test it with a meter.
I used to have those specs but lost them - and haven't bothered to dig it back out on the net.
>If it is on their side make the service call from the demark and tell em
>that. You'll save 5 minutes on the phone...after 30 minutes on hold.
I've never gotten it to come back at the demark other than just waiting - at which point it worked with all the phones again.
What I've done the last few times is to make an automated call to report 343-2723, then on the call to report 343-0941, punch the button for "other" and talk to the dispatcher.
That at least combines the calls and attempts to associate the problem with the PAIR of lines.
>My neighbors work for SWB and they are very busy. Rain is not a friend of
>the phone company.
Of that... I am completely sure!
I'm just happy that none of this rain seems to bother my cable modem or DSL connections.
-- LAURENCE C. BREVARD Laurence.Brevard@MediSpecialty.com Vice President of Information Systems MediSpecialty.com, Inc. http://www.MediSpecialty.com Home of OBGYN.net http://www.OBGYN.net Home of OTOHNS.net http://www.OTOHNS.net
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