30 Years of the Digest ... founded August 21, 1981
The Telecom Digest for April 14, 2012
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Date: Thu, 12 Apr 2012 22:11:27 +0000 (UTC) From: firstname.lastname@example.org (Rich Greenberg) To: email@example.com. Subject: Re: DSL line question-Verizon-filters Message-ID: <firstname.lastname@example.org> In article <email@example.com>, Michael <firstname.lastname@example.org> wrote: >I just replaced my Verizon modem...they sent me a new one because the >old one would periodically drop signal, and had to be re-booted each >time. As a followup they called my today to check that everything was >OK. They ran a line test because they said they weren't seeing a >perfectly good line. I disconnected everything from the demarc and >the number that had been 1400, was now perfect, around 3500. Not sure >what that means, but she suggested replacing all my DSL filters...they >go bad she said. I have about 10 in the house, including some that >serve more than one device, e.g. caller id boxes, wireless phones, >answering machine, etc. > >Do the filters go bad? I occasionally will hear some DSL noise >when two phones are off - hook at the same time. Otherwise everything >seems to work OK. > >They scheduled to call back in a week to see if there's an >improvement. I have some new filters, never used, that I could put >in. I'd welcome any comments. This has been covered in the digest before. To summarize, the best thing you can do is put 1 filter at the demark, and unless you have all home run wireing already and can isolate the jack with the modem, run a seperate wire from the demark (before the filter I just suggested, or from the unfiltered jack of the filter) direct to the modem. At my previous house, I had done that and on a service call for an unrelated problem, the tech saw it and said "I can do better". He then replaced part of the demark with a terminal block with a filter built in. -- Rich Greenberg Sarasota, FL, USA richgr atsign panix.com + 1 941 378 2097 Eastern time. N6LRT I speak for myself & my dogs only. VM'er since CP-67 Canines: Val,Red,Shasta,Zero,Casey & Cinnar (At the bridge) Owner:Chinook-L Canines: Red & Max (Siberians) Retired at the beach Asst Owner:Sibernet-L
Date: Thu, 12 Apr 2012 20:15:38 -0400 From: Ron <email@example.com> To: firstname.lastname@example.org. Subject: Re: DSL line question-Verizon-filters Message-ID: <email@example.com> Michael <firstname.lastname@example.org> wrote: > Not sure >what that means, but she suggested replacing all my DSL filters...they >go bad she said. I have about 10 in the house, including some that >serve more than one device, e.g. caller id boxes, wireless phones, >answering machine, etc. If your house has one DSL jack and one phone jack, it makes some sense to put a filter on the phone jack. This doesn't really describe most homes, though. It seems like a crazy idea to have a house with one DSL output and lots of analog outlets and put filters on all lines but one. As long as at least one of your filters is questionable, you might want to consider a DSL splitter. The phone line comes into the house, goes to the splitter, and one line goes out for DSL and all the rest of the phone wiring goes to the non-DSL output contacts. -- Ron (user telnom.for.plume in domain antichef.com)
Date: Fri, 13 Apr 2012 08:39:40 +1000 From: David Clayton <email@example.com> To: firstname.lastname@example.org. Subject: Re: DSL line question-Verizon-filters Message-ID: <email@example.com> On Wed, 11 Apr 2012 13:53:35 -0700, Michael wrote: .......... > They scheduled to call back in a week to see if there's an improvement. I > have some new filters, never used, that I could put in. I'd welcome any > comments. Put in one central filter at the demarc and run the modem directly off it. It is ridiculous to have so many separate filters. -- Regards, David. David Clayton Melbourne, Victoria, Australia. Knowledge is a measure of how many answers you have, intelligence is a measure of how many questions you have.
Date: Thu, 12 Apr 2012 17:34:39 -0700 From: Andrew Carey <carey@ar-ballbat.VALID-IF-THIS-IS-ELIDED.org> To: firstname.lastname@example.org. Subject: Re: DSL line question-Verizon-filters Message-ID: <D6647226-ADD6-485E-B8B3-F0E26D2FE664@ar-ballbat.VALID-IF-THIS-IS-ELIDED.org> On Apr 11, 2012, at 1353, Michael wrote: > I disconnected everything from the demarc and the number that had > been 1400, was now perfect, around 3500. Not sure what that means, > but she suggested replacing all my DSL filters...they go bad she > said. I have about 10 in the house, including some that serve more > than one device, e.g. caller id boxes, wireless phones, answering > machine, etc. She's giving you the resistance measurements in kohms. 1500 kohms is a possible high resistance condition but you really need more information. Measurements are made tip-ring, tip-ground, ring-ground and a few others and the individual values are reported along with an overall characterization of the line test. Without knowing those and no apparent problems with your voice calls, I wouldn't necessarily worry about it. Troubleshooting physical DSL trouble remotely is kind of difficult. Can she pull your DSL connection stats? Is the SNR dropping? Better to have a tech with a good meter take a look at your SNI and then at the modem jack to see what's going on. 10 splitters is kind of a high number and you're possibly seeing some reflectance. If possible I would isolate the run to your DSL modem from the other runs at the SNI and put a single filter for your phones there. There are SNI modules available that do filtering right in the SNI now. Don't know if Verizon can put one in but that would be ideal.
Date: Fri, 13 Apr 2012 04:04:28 +0000 (UTC) From: David Lesher <email@example.com> To: firstname.lastname@example.org. Subject: Re: DSL line question-Verizon-filters Message-ID: <email@example.com> Michael <firstname.lastname@example.org> writes: >Do the filters go bad? I occasionally will hear some DSL noise >when two phones are off - hook at the same time. Otherwise >everything seems to work OK. Can you put one filter in near the demark, put all the phones downstream of it; and have the modem on an unfiltered branch? -- A host is a host from coast to coast.................email@example.com & no one will talk to a host that's close........[v].(301) 56-LINUX Unless the host (that isn't close).........................pob 1433 is busy, hung or dead....................................20915-1433
Date: Fri, 13 Apr 2012 10:48:11 -0700 (PDT) From: HAncock4 <firstname.lastname@example.org> To: email@example.com. Subject: Cellphone thefts increase in L.A. Message-ID: <firstname.lastname@example.org> >From the Los Angeles Times: "Police in downtown Los Angeles have seen cellphone thefts soar 32% as smartphones like the IPhone become easily turned into pay-as-you-go phones. Police said phones are being commonly snatched from restaurant tables, libraries and nightclubs as people leave them unattended." for full article please see: http://latimesblogs.latimes.com/lanow/2012/04/cell-phone-thefts-on-the-rise-in-downtown-la.html -or- http://tinyurl.com/7t3a63w
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