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I have made a contract recently, for a DSL only line (dry DSL; no telephone) at 10Mbps. From the day one it is disconnecting every now and then. After complaining to the company they tried to make the line stable first by lowering the speed to 2Mbps and increasing finally to 7Mbps. At 7Mbps now it is stable.

My contract is for 10Mbps and I want that speed. And because with 7Mbps the upstream goes quite low. Now the company technician is telling me that this is the limitation at my end and I must do what he is suggesting to get what I want.

Some of the stats I have copied from the ADSL router at 192.168.1.1:

  • Line standard: ADSL2+
  • Channel type: Interleaved
  • Downstream line rate (kbit/s): 7111
  • Upstream line rate (kbit/s): 56
  • Downstream SNR (dB): 19.6
  • Upstream SNR (dB): 12
  • Downstream line attenuation (dB): 22
  • Upstream line attenuation (dB): 16.9
  • Downstream output power (dBmV): 0
  • Upstream output power (dBmV): 10.9
  • Downstream CRC: 200
  • Upstream CRC: 0
  • Downstream FEC: 46651
  • Upstream FEC: 6909

I have seen this question and answer thread about the right gauge of wire for an ADSL line, but still I need an answer. My question is:

Should I really spend money purchasing Cat 6 instead of using the in-building pre-installed normal telephone line wire?

Will it really improve things?

I am on the 3rd floor, so will it work at a length longer than 50 feet?

If yes will I be using only two lines—one pair out of four—from that Cat 6 cable?

Also can someone suggest what’s going wrong here—if anything—and what would be the fix?

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tod
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2 Answers2

4

If the building's wiring is truly the culprit, which can be determined by the technician wiring a jack as close as possible to the demarcation point, and to that, temporarily connecting the DSL modem, so an improved SNR can be demonstrated, then indeed, a new line is indicated to bring the desired service to your apartment.

A reference to DSL statistics can be found here, at DSLReports.com

Nevin Williams
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2

I have added some details to @Nevin Williams' answer. In fact his answer led to the solution. But, what were the outcomes, I also wanted to share those.

Here the building wiring was creating the problem and it was solved by using external CAT-6 FTP wiring.

The exact answers to the questions asked go as following:

Should I really spend money purchasing Cat 6 instead of using the in-building pre-installed normal telephone line wire?

Ans: Yes if the test shows a difference, as said above.

Will it really improve things?

Ans: Yes it will surely improve.

I am on the 3rd floor, so will it work at a length longer than 50 feet?

Ans: It (CAT 6 FTP) has already worked perfectly for a length of 51 meters (~167 feet) to carry a DSL line.

If yes will I be using only two lines—one pair out of four—from that Cat 6 cable?

Ans: Yes, only one pair.

Also can someone suggest what’s going wrong here—if anything—and what would be the fix?

Ans: well, After the change of this cable the stats in question have been changed to the following(which show an improvement and a stable connection, as we can see here about SNR and attenuation):

Line standard: ADSL2+
Channel type: Interleaved
Downstream line rate (kbit/s): 10239
Upstream line rate (kbit/s): 510
Downstream SNR (dB): 19.8
Upstream SNR (dB): 29.8
Downstream line attenuation (dB): 12.5
Upstream line attenuation (dB): 5.5
Downstream output power (dBmV): 0
Upstream output power (dBmV): 12.6
Downstream CRC: 0
Upstream CRC: 0
Downstream FEC: 11
Upstream FEC: 0

Also as an important note I would like to mention that, I did get 10 Mbps sometimes with internal wiring, but it used to decrease Downstream/Upstream SNR to ~6dB, while its now ~20dB and ~30dB, respectively. That's the big gain, that really solved the problem of disconnection.

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tod
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