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Re: multiplexed home phone lines and rain problems
From: David Weaver (bubba@tx.com)
Tue, 26 Dec 2000 16:47:47 -0600
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Agua!It is likely that water is causing a circuit to complete...sometimes. This is why 'call forwarding on busy-no answer' is working. You complicate the issues by overloading your circuits too.
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.
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. 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) :-)
The total of all of the RENs on any phone line can not exceed 5. 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.
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.
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.
My neighbors work for SWB and they are very busy. Rain is not a friend of the phone company.
Happy Holidays to all!! David Weaver
-----Original Message----- From: Laurence C. Brevard [mailto:Laurence.Brevard@medispecialty.com] Sent: Tuesday, December 26, 2000 2:35 PM To: geeks@obgyn.net Cc: techtalk@obgyn.net Subject: multiplexed home phone lines and rain problems
GEEK FRIENDS and TECHTALK SUBSCRIBERS:
I am having a strange problem with a pair of multiplexed telephone lines at home.
I wonder if anyone out there on the geeks or TECHTALK lists has heard of this or knows the operational parameters of multiplexed home lines.
SHORT VERSION: A very loaded pair of multiplexed phone lines quits working when there has been a lot of rain but a second (less loaded) pair of multiplexed lines never shows that problem.
LINE DETAILS: Lines 1 & 2 come to our house on a single local loop "pair" with a multiplexor installed on the outside of the house at the network interface box. Two separate lines come into a wiring closet and are wired to various extensions.
There is NOT a PBX or "brain" at the center of this nor any additional amplification of the lines. There probably should be because:
Line 1 is "my" number 512-343-2723 - goes to 8 extensions Line 2 is my wife's number 512-343-0941 - goes to 8 extensions
Lines 3 & 4 are multiplexed in the exact same way but there are many fewer extension locations.
Line 3 is the fax machine at 512-343-2964 and 512-343-2965 (with distintive ringing) - goes to one fax machine, one computer, one extension Line 4 is for my wife's parent's "apartment" portion of the house. - goes to four extensions
Line 5 is a clean local loop (originally used for ISDN) with a single analog circuit plus ADSL with a splitter at the network interface. That line is so clean I can use the analog portion with a V.90 modem and get connections at 53,666 baud.
PROBLEM SYMPTOMS: The normal problem is that lines 1 & 2 appear to have gone off hook but present no dial tone in the house. If you call either number you hear ringing but it never rings at the house.
A variant of the above is that once any call is made to either line, it rings in the house and then both lines work again.
Today's symptom is a bit weirder. No dial tone is present on either line. If someone calls, it rings but when you answer you get silence at both ends.
I used "remote access to call forwarding" to forward lines 1 & 2 to my and my wife's cell phones respectively.
Now when someone calls in, you get one short ring - indicating the line is forwarded - and then it forwards to the cell phone.
TELEPHONE COMPANY RESPONSES: Usually the problem has disappeared by the time the phone company technician arrives.
Over the last two years I have gotten them to change various parts of the system including the multiplexor at my house and the line card that it talks to in a wiring cabinet about two blocks away.
ONE THEORY: Since the multiplexor and the lines that it drives are all "line powered" my theory is that, after the rain, due to leakage in wet lines, there is insufficient current to power the multiplexor and all the lines connected to it.
This affects lines 1 & 2 because there are so many extensions connected. Lines 3 & 4 have only two and three extensions respectively.
If this theory is true, putting a PBX "brain" at the center and letting it drive all the extensions will solve the problem.
However, disconnecting lines 1 & 2 from the house wiring does bring the lines back to working condition after they have quit. Only time seems to fix them. This argues against it being the load on the lines.
ADDITIONAL NOTE: I do not run any sort of home phone line networking on any of these phone lines. I'm techno-morally opposed to it! I have real CAT-5 cabling running a mixture of 100TX and 10base-T Ethernet (and one old Linux system on 10base-2 coax Ethernet).
COMMENTS? Other than that I have way too many phone lines!!! And too much wire in the attic!
-- LAURENCE C. BREVARD Laurence.Brevard@MediSpecialty.com Vice President of Information Systems 5124266237@mobile.ATT.net 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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