sundance-communications.com/forum Forums General General Telephone & Systems Information DSL Problems

Just installed a system(nec ds2000). . Customer has DSL & fax on line 4. Here's how I have it set up now.

KSU co's are terminated on 66 blk, cross connect from KSU co port pins to a rj11 modular end that plugs into filterthat plugs into a jack. From the jack there is cross connect that goes to toe demarc.
At the demarc there is cross connect that goes directly to the station cable for the fax and cross connect that goes to another jacke which plugs into that DSL modem.

Fax works, Line on phone system doesn't.
Any help would be appreciated.

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| Capitol Communications | Telephone Systems

Have you checked the line at the jack where you are plugging in the DS-2000 with a known good Single line telephone/or Buttset?

The Co line at the demarc should go through the filter then out to the phone system and the fax.

The line for the DSL modem should go directly to the Demarc.

The whole purpose of the DSL filter is to remove the RF signal and subsequent hiss from the line so that it will not affect the analog equipment.

You can run it without the filter but the customers will complain about the hiss and some phone systems don't like the RF and harmonics caused by DSL.


DJ



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Watson to Bell: "It must be working, all I get is a busy signal"

Whenever possible we do not connect the DSL line to the phone system. Especially witht he DS 2000. We run it directly to the fax and then run a seperate line to the modem from the Demarc.

Ok, I'm gonna bite here. Why would you say that data-tel?

Have you tried differant mod plug on the trunk card, just may be the culprit?


And by the way I have several 1000/2000 installs hooked up to dsl's with no problems.

[This message has been edited by clgjr (edited September 14, 2005).]

Matt, if you still have that problem call me today from the jobsite........2 heads are better then 1......

mitch

Thanks, I just might do that.

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| Capitol Communications | Telephone Systems

What's the quality of your filter? I've come across cheap units that do very little filtering. Others are excellent & filter so good that my butt set won't detect DSL signal on the filtered side.

It was a bad jack. Replaced it and now it works. Thanks for the quick responses.

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| Capitol Communications | Telephone Systems

IMHO DSL should be installed to a stand alone line or a fax. Why would I want to add the extra headache to something I have to maintain and warranty. Unless the end user desperately needs the extra line for voice I wouldn't recommend it. Just my opinion I guess.

Actually, I recommended another line. He took my advice and is ordering a seperate line tomorrow.

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| Capitol Communications | Telephone Systems

I've also seen some systems that need 2 or 3 filters in series to cut out all the DSL noise or to allow enough DSL signal to get to the modem. Mostly NEC and the free SBC filters.

I agree it is normally a bad idea to share a fax and CO input on a KSU. The only way I would ever do that is if the fax is through an ATA to show users that that line is "in use." A DSL line though can be shared between the modem and the KSU as long as a filter is installed. In my area Bell will attach the DSL to whatever line is going through a digital switch on their end. They try the fax line first but it may end up on a voice line. I also agree that there is a big difference in quality of filters. A good buttset will prove this during the install.

If the fax is not connected through the KSU, what I usually do is connect the KSU to the phone port of the fax. This will work like putting in line share devices. So one can not interrupt the other.

All filters are not created equal. A DSL filter must create high impedance to the DSL signal. This will prevent any of the DSL signal from going into the filter and all of the signal will go from the line to the DSL modem or from the modem to the line. I have some filters that have low impedance on the “telephone” side of the filter. If the filter is wired backwards (telephone side to line and line side to telephone) the filter will absorb some of the DSL. This will prevent the DSL from working.