Two DSL modems on one phone line

April 11, 2011 at 02:29:01
Specs: Linux i686
I'm asking for a non-tech friend so brand names and models are not known. I think the question is general enough anyway:

In a house that is too large for a small wireless modem to send a signal far enough, is it possible to use a second modem in the same phone line (not at the same time). Filters are used in the spare phone jacks.

My main question is: when modem A is being used and modem B is switched off, is it necessary for the splitter for modem B to be removed and the filter put in its place? Or is the fact that modem B is switched off sufficient? I suspect that it's necessary and that's why my friend gets very slow download speeds even when the other modem is off.

She insists that it used to work but I think she was just lucky if it used to work.


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#1
April 11, 2011 at 07:14:42
My main question is: when modem A is being used and modem B is switched off, is it necessary for the splitter for modem B to be removed and the filter put in its place? Or is the fact that modem B is switched off sufficient?

It's sufficient to turn the modem off.

I suspect that it's necessary and that's why my friend gets very slow download speeds even when the other modem is off.

No it's not.

A filter is ONLY required if you're plugging a telephone in. If you're not plugging a phone in to that line, no filter is required.

If there's an issue with her download speeds she should google "bandwidth speed test" and try a couple from different sites and compare them to what she's supposed to be getting. There can be many different reasons for slow downloads and none of them have to do with filters.

Just FYI, not only am I a networking professional, I have ADSL at home and there are phone outlets in every single room in my house. The only ones I have filters in are the ones with an actual phone plugged into them. The rest sit empty. With the modem powered off, it's the equivalent of an empty outlet.

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***


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#2
April 12, 2011 at 03:22:47
Thanks for clearing that part of it up.

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