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83 posts

Master Geek

#19815 2-Mar-2008 16:38
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I jsut read this in the GP fourms

ziN wrote: Atm, I'm only using one filter and that's from the router to the wall

You DON'T want any filter there, I suggest you remove it."

Your not surpose to have a filter from your router which has a adsl black cord that connects to a filter that has a connecttion to go into the wall where you get your internet from?

[Moderator edit (TH): How the heck are we supposed to read black text on black background?]

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7833 posts

Uber Geek


  #114152 2-Mar-2008 16:45
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I think you need to explain in slightly more elaborate english exactly what you are on about.

As for DSL filters, a filter is required between the direct line and any POTS (Plain Old Telephone Service) device such as a phone, fax or other voice band modem like a sky box. Your DSL modem connects directly to the inbound line.

Most filters that you buy in the shops have an input BT plug that connects to the phone line, and two outputs, one BT output socket that connects to a POTS device and one RJ11 socket that connects to your DSL modem. Inside these there is just one filter that sits between the input BT plug and the BT ouput socket, the RJ11 simply connects to the input.

As such if you have no phone only a DSL modem connected to a particular phone socket then you dont need a filter. However any other POTS devices in the house on the same wiring need to have a filter so to isolate POTS device from loading the line in the DSL band and to keep DSL noise out of the POTS device.

A DSL modem does not need a filter if no other POTS devices are connected across the line.

Edit, one other point, you should not have too many filters across the line, the less the better. Telecom state a maximum of 5 filters, if you have more than that you will need a central filter installed. Too many filters will begin to load the line and potentially reduce DSL performance.


2021 posts

Uber Geek


  #118967 27-Mar-2008 05:19
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Some people do filter the modem signal, and get either 64kbps or no signal at all. They normally complain alot too and dont tell anybody clearly how they setup the filter. Eventually they say something about th filter and get told to connect it the right way.

Time to find a new industry!


7 posts

Wannabe Geek

  #119991 31-Mar-2008 18:27
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Different filters have been shown to give different sync rates. I've tried 4 different filters on my home line (using only 1 jackpoint in the house) and the sync rates varied between 7.1mb and 6.4mb. With my 128kb upload, I didn't notice any difference in throughput.

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