ASDL speed - with house wiring - removes orange bell wire improves speed. Why?
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ASDL speed - with house wiring - removes orange bell wire improves speed. Why?
09-09-2007 10:04 PM
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My modem reports train ups of 3600 ish.
When I direct connect to the master socket I get 5200
Attach the telephone extensions, it drops to 3600.
I noticed that my Solwise ADSL micro filters ( purchased back in 2003 ) only had two connections on the plug for pins 2 and 5. ( All phones are filtered by these at the phone end of the extension. )
So I disconnected the orange bell wire at the master socket, and now my modem trains up at 5100.
What is the physics behind this? My Solwise 715 allows ADSL SHOW CHANNELS command which dumps the bits each bit bin can handle, and I get more channels handling bits with the bell wire disconnected.
Why?
many thanks, Doug
Re: ASDL speed - with house wiring - removes orange bell wire improves speed. Why?
09-09-2007 11:20 PM
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http://yarwell.blogspot.com/2005_08_01_yarwell_archive.html
Basically the ring wire isnt used anymore and all is does it act as an antena to collect noise
Re: ASDL speed - with house wiring - removes orange bell wire improves speed. Why?
10-09-2007 12:12 AM
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The ring wire introduces noise into the main 2 wires which reduced your SNR (signal to noise ratio). The higher your SNR, the better chance of getting a faster sync rate with ADSL Max.
ADSL filter/splitters have circuitry to cater for the bell wire (although most modern phones don't need it) so you don't actually need it.
Re: ASDL speed - with house wiring - removes orange bell wire improves speed. Why?
10-09-2007 1:01 PM
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Its also worth noting that many phone extension kits contain poor quality cable.
Re: ASDL speed - with house wiring - removes orange bell wire improves speed. Why?
10-09-2007 1:04 PM
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Re: ASDL speed - with house wiring - removes orange bell wire improves speed. Why?
10-09-2007 1:19 PM
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With dial phones all phones had the ring capacitor fitted but there was a link that had to be moved for extension phones to disconnect the capacitor so the extension phone's bell was connected to the master phone's bell.
Re: ASDL speed - with house wiring - removes orange bell wire improves speed. Why?
10-09-2007 5:48 PM
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Quote from: samuria for full details see
http://yarwell.blogspot.com/2005_08_01_yarwell_archive.html
Basically the ring wire isnt used anymore and all is does it act as an antena to collect noise
If you move house I recommend that you put the ring wires back as not all phones have the ringing circuitry. I know that if I plug my extensions in without the filter fitted they do not ring.
Quote from: oliverb With dial phones all phones had the ring capacitor fitted but there was a link that had to be moved for extension phones to disconnect the capacitor so the extension phone's bell was connected to the master phone's bell.
True, the old loop disconnect electro-mechanical phones, the ones with the bell, when dialling out the extensions use to tinkle. So to stop this all the extensions use to be fed from the master phone.
Now that phones don't use loop disconnect and electro-mechanical bells interference no longer take place so the circuitry can be placed back into the phones.
Re: ASDL speed - with house wiring - removes orange bell wire improves speed. Why?
10-09-2007 9:50 PM
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I get similar 'frequency' plots when I do the ADSL SHOW CHANNELS command on my Solwise ADSL modem.
It seems to be a classic multipath problem where two signals route via different paths and add together. You get a comb filter effect when a signal source drives two paths to the destination.
Re: ASDL speed - with house wiring - removes orange bell wire improves speed. Why?
10-09-2007 9:56 PM
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Re: ASDL speed - with house wiring - removes orange bell wire improves speed. Why?
13-09-2007 7:45 AM
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When I had the Bell wire ( pins 3 or 4 ) connected at my master socket It trashed my MaxDSL connection.
I disconnected it at the Master socket and my MaxDSL is MUCH MUCH MUCH better!.
My master socket as wired on my 1991 houseconnected the B wire to the bell wire via the 1u8F capacitor. This is in the removable bit of the NTE5 master socket. All six wires were being sent to the extensions in the house. Now only the Blue White wires are connected to pins 2 & 5.
My Line used to get 1M before MaxDSL.
I was MaxDSL'd and the Down Stream speed was about 3600K, but the speed tests have been 400K and down to 136K and really bad after getting back off holiday.
After I disconnected the bell wire at the master socket, my speed went up. Last night I got 5M download!!!!!!!
After 2 years of Support desk questions, I spent a few hours testing every filter in my house direct to the NTE5 master socket measuring with my Solwise 715 ADSL router. It allows you to do a command ADSL SHOW CHANNELS.
My ADSL Modem is normally at the other end of the phone extension wiring in my Computer den bedroom, with three phones spured off with filters at their sockets. This configuration must be typical but is not an option in Help pages.
Last Sunday, I established that the old Solwise microfilters only used two pins on the BT plug. They use pin 2& 5. I thought, Why do I need to connect the bell wire on Pin 3 ( or 4 )? When I disconnected it my download speed went up to what I got when directly plugged into the master socket.
So at the Master socket the house extension wire only connects the blueWhite & WhiteBlue wires to pins 2&5.
You MUST have micro filters with the bell capacitor in them, ( otherwise the phone will not ring ) for each Telephone.
I now have all my extensions connected with filtered phones using Solwise filters purchased back in 2003.
The effects are dramatic. All my phones are now crystal clear transmission.
Now I get unbelievable train up and download speeds.
I spoke to a plus net customer at work and he tried it tuesday night and his download speed went from 100K to 800K!
I brought a CE marked ADSL from the local Hardware store and it would only allow my ADSL modem to train up at 2800. The bell wire ( pins 3 or 4 ) were direct connected through.
After a reboot and a wait for my BRAS profile to re sync, My broad band may be broad band instead of hairline band!
My BRAS profile has been 4500 for three days now, instead of 500
Re: ASDL speed - with house wiring - removes orange bell wire improves speed. Why?
15-09-2007 9:43 PM
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I have put a web page up, with examples of ADSL SHOW CHANNEL with and without the bell wire.
http://www.dougrice.plus.com/Erlangs/adsl.htm
The plots are consistant from day to day with minor variations.
My ADSL down stream speeds had been decreasing over the week, with my Solwise 715 needed a reboot almost every time I turned on my PCs.
There seem to be nulls every 10 to 11 channels.
Am I right these are 40Khz apart?
My ADSL has been really good this week. Colleagues at work have tried it on their Plusnet ADSL connections and had major improvements as well.
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