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Old 09-28-05, 03:52 PM   #1
desmoface
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computer/dsl question

Hey gang...Sure would appreciate any advice...I am getting dsl turned on next Tuesday. Yahoo/sbc sent me out the modem and filters..Do I have to use a filter on the line that the dsl modem is going to be plugged into? This jack will not have a phone, it will be dedicated to the dsl modem. Thanks in advance for any advice.

Steve
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Old 09-28-05, 04:31 PM   #2
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The filters only go on any other jack(s) that share the same number as the DSL line -- this could be other jacks in your home that share the same line. If your DSL line terminates at only one jack and no phone will be attached to it (using a coupler) the filter isn't needed.
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Old 09-28-05, 04:37 PM   #3
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^ What they said.
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Old 09-28-05, 04:38 PM   #4
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I switched to a DSL account a few months ago. My installation instructions indicated one of the filters should be in line ahead of the DSL modem. After a few days, I started having some trouble. The help desk told me to remove that filter; it's not necessary and can cause some difficulties. No more troubles.

Enjoy your DSL.

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Old 09-28-05, 06:31 PM   #5
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Hey gang, knew I could count on you...Thanks for the info..now I can't wait to get rid of aol and get dsl up and running...WOOHOO!!

Steve
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Old 09-28-05, 07:41 PM   #6
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By the way....if the filters seem to do nothing...as in your DSL still drops whenever you receive a phone call...call your phone company to take a look at the premises wiring...there could be an MTU attatched (an old archaic piece of test equipment...notorious for screwing up DSL lines...PacBell is notorious for leaving these on houses).
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Old 09-28-05, 08:06 PM   #7
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Throw the Yahoo DSL CD away as well. It will hijack your PC. All you need to do is plug in the modem, and then type in 192.168.2.1. in your address bar.

For User ID just use: sbcyahooreg@sbcglobal.net

Password is: sbcyahooreg
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Old 09-28-05, 08:39 PM   #8
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Hey gang, thanks again for all the replies...It threw me for a loop because these filters have an output for both a phone and the computer, so I was thinking that maybe I have to run the modem through the filter...

Hi Ranger, I'm not good with puters, I'm afraid that I should stick with the cd as I won't know what to do if there is a problem with the hookup. I will make sure I run my adware after the install...Thanks again for the replies.

Steve
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Old 09-28-05, 09:50 PM   #9
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If the filter has an ouput for the phone, it's probably intended for a dialup modem (who used dialup when the have DSL, though?). Here's the lowdown:

Your phone operates in the audible range (16 Hz -22 kHz, actually less than that, but that's nitpicking). Dialup modems also use this range (you know the fax machine beeping and squeeling?) because signals in that frequency range can be passed through the phone switching equipment to a service providers modem on the other end, even if it's on the other side of the country. DSL, however, operates at frequencies above what the human ear can hear. It has both a higher frequency and a wider frequency range (aka broadband), which allows it to be much faster than dialup. The catch is that the signal will not be passed on telephone switching equipment, so the service provider has to have equipment between your phone and the switch to process the signal, which is partly responsible for the higher cost.

Now, back at your house, the modem processes the signal for the benefit of your computer. However, even though the DSL signal is to high-pitched for you to hear it's possible for the signal to cause interference on your phone. I believe this is due to an effect called aliasing, where electronic equipment picks up part of a high frequency signal as a low frequency signal. This sounds like really bad static. The filters are a device called a low pass filter that only lets signals below 22 kHz pass through it. That means phone signals will go through, but DSL won't, so it can't be interpreted by the phone as static. If you plug your DSL modem into a filter, you shouldn't be able to get a connection because it cuts off the DSL portion of the signal (although some filters may have enough transition zone that you can still get a crappy connection).
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Old 09-29-05, 07:06 AM   #10
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Hi Iam, that explains it perfectly. Thanks alot.

Steve
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