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No4



14 posts

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# 41261 12-Sep-2009 19:17
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I have attempted to install an MM3200B Central Filter but despite a dial tone through it my modem would notget a dsl connection.

A bit of back story:

My modem is a Linksys WAG200G with which I get a tolerable connection but fairly regular droputs (modem thinks its connected, status lights green but nobody's home).  General performance stats below (connected to Vodafone's Red Network, cabinetisation due by April 2011).

DSL Status: Connected
DSL Modulation Mode: G.dmt
DSL Path Mode: Interleaved
Downstream Rate: 4640 kbps
Upstream Rate: 928 kbps
Downstream Margin: 9 db
Upstream Margin: 11 db
Downstream Line Attenuation: 33 db
Upstream Line Attenuation: 9.5 db
Downstream Transmit Power: 11 db
Upstream Transmit Power: 18 db

Apparently this is a known issue with this model but one of the suggestions with any connection issues is to clean up the internal wiring.  My phones are wired through a C-Net distribution hub that branches out through the house so there are a significant number of jackpoints and at least 6 phones/faxes connected (all with filters).  An obvious move seems to be to move to a Central Filter to reduce the possible influence this system has on the dsl connection.  I picked up the recommended Marque Magnetics MM3200N at MasterTrade.

Wiring seems simple enough - connect the incoming line and the ADSL line to the orange/white wires at one end and connect the downstream phones/CNet hub to the blue and white wires at the other.  I did this inside the CNet hub as there was already idc connectors for an adsl point in the hub so I just moved the incoming line over to those, added the orange/wite filter wires and then connected the blue/white filter wires back to the incoming line position.

The phones immediately started working again but the modem would not make a connection.  Swapping the line back to the incoming position and switching back to a jackpoint connection for the modem immediately fixed the problem.

I can't see how I'm doing anything wrong.  Anyone have any ideas?

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  # 255456 13-Sep-2009 20:48
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Hi, as you describe what you have done, I cannot see what you have done wrong, although not being familiar with your Cnet hub (link please) I cannot comment if there is some issue there.


Cyril

No4



14 posts

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  # 255468 13-Sep-2009 22:05
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Actually, that was a ConnecNet home distribution hub that I have. I have sorted the problem now - I think I outsmarted myself. I have located the modem right nect to the hub, and in order to reduce the number of connections I took a stand phone/modem lead and cut the wall plug off, terminating the free ends in the adsl idc connectors. However that lead has very fine multi strand wires, so obviously they weren't making a good connection. strippping the wires and using a terminal block made all the difference. There was an immediate improvement in the connection, as you can see, although I have still had to do one reset today.

DSL Status: Connected
DSL Modulation Mode: G.dmt
DSL Path Mode: Interleaved
Downstream Rate: 6304 kbps
Upstream Rate: 960 kbps
Downstream Margin: 7 db
Upstream Margin: 11 db
Downstream Line Attenuation: 33 db
Upstream Line Attenuation: 9 db
Downstream Transmit Power: 11 db
Upstream Transmit Power: 19 db

Now I just have to look at flashing the firmware and figure out whether G.dmt is the best modulation to be using. I've read elsewhere on Geekzone that the WAG200Gs have problems with much else. Still on the dsl learning curve.

 
 
 
 


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  # 255500 14-Sep-2009 07:39
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Hi, G.dmt is standard ADSL1, you will need G.dmt.bis+ is what ADSL2+ is normally described as. That said 6.3Mb/s is still quite low for 33dB attenuation.

Personally from my experience the WAGs are piles of poop.

Cheers
Cyril

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  # 255719 14-Sep-2009 19:45
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Interesting - I tried ADSL 2+, which dropped performance slightly to 6131/1056. Multimode obviously chooses the same modulation, but ADSL 2 improved results a bit more

DSL Status: Connected
DSL Modulation Mode: ADSL2
DSL Path Mode: Interleaved
Downstream Rate: 7115 kbps
Upstream Rate: 1085 kbps
Downstream Margin: 9 db
Upstream Margin: 9 db
Downstream Line Attenuation: 33 db
Upstream Line Attenuation: 8.5 db
Downstream Transmit Power: 12 db
Upstream Transmit Power: 19 db

So we'll leave things like that for a bit and see how stability goes. If that's still flakey it looks like I'll swap out to a Dynalink RTA1025W based on reviews.

Thanks for your suggestions

Ryan

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