ADSL Facts

Posted January 14th, 2009 by Sukaru Kiddo

Bad ADSL Signal:
Statistics — ADSL

Mode: G.DMT
Type: Interleave
Line Coding: Trellis On
Status: No Defect
Link Power State: L0
Downstream Upstream
SNR Margin (dB): 7.6 12.0
Attenuation (dB): 13.0 4.5
Output Power (dBm): 7.8 12.5
Attainable Rate (Kbps): 5696 1120
Rate (Kbps): 5024 800
K (number of bytes in DMT frame): 158 26
R (number of check bytes in RS code word): 16 16
S (RS code word size in DMT frame): 1 8
D (interleaver depth): 64 8
Delay (msec): 16 16
Super Frames: 93159 93157
Super Frame Errors: 939 344
RS Words: 6334878 791834
RS Correctable Errors: 239143 548
RS Uncorrectable Errors: 52196 N/A
HEC Errors: 302 242
OCD Errors: 85 46
LCD Errors: 2 18
Total Cells: 18621675 0
Data Cells: 424812 0
Bit Errors: 0 0
Total ES: 93
Total SES: 14
Total UAS: 21

As you can see “Super Frame Errors” and “RS Uncorrectable Errors” are the two most important thing in a DSL service. If those two numbers get really high, it is not a good sign, you will probably see high latency, packet loss, cannot browse at all or intermittent connection.
Other things that can happen is that your profile will not be at what it should be, mine was 6016, but because of the problem it is at 5024 and it get lower if the line get worse.

Why do I get this problem and how do I fix it:
Check you Dmark inside or outside the house and see if there isnt any corrosion on the wires. If it is outside the house, normally it should be free of charge, if it is inside, it’s really easy to fix it, it’s just copper wires nothing else.

Check your phone jack and telephone cable. Simple, no?

Call you ISP asap to check up on your connection, ask them to see the “lantern”. The lantern is a tool that ISPs have to check on people’s adsl line, they can see block counts, the profile, the sync, and problems on the line (but some ISP don’t have this option if they are a reseller).

If a tech comes by your house and blames the modem, (which every freaking tech does, surprise them) bring another out and show him it does the same thing and tell him it is the line, not the hardware. (But sometimes in rare cases it is the modem that is faulty, so best to have a few, buy them or find them)

In special cases like mine, this happens once a blue moon, Bell-Nexxia (who are in charge of the dsl lines), can’t fix the problem because they don’t see a problem when they come over to check my line. Why? because my intermittent issue somehow disappeared…

How can I get these readings:
It will depend on the modem you have, some have this option, some don’t. When you don’t have these reading, call your ISP to find out.

Good ADSL Signal
Statistics — ADSL

Mode: G.DMT
Type: Interleave
Line Coding: Trellis On
Status: No Defect
Link Power State: L0
Downstream Upstream
SNR Margin (dB): 9.8 17.0
Attenuation (dB): 14.0 4.5
Output Power (dBm): 7.8 12.5
Attainable Rate (Kbps): 7392 1280
Rate (Kbps): 6016 800
K (number of bytes in DMT frame): 189 26
R (number of check bytes in RS code word): 16 16
S (RS code word size in DMT frame): 1 8
D (interleaver depth): 64 8
Delay (msec): 16 16
Super Frames: 12270 12268
Super Frame Errors: 0 0
RS Words: 834426 104278
RS Correctable Errors: 99 0
RS Uncorrectable Errors: 0 N/A
HEC Errors: 0 0
OCD Errors: 0 0
LCD Errors: 0 0
Total Cells: 2946106 0
Data Cells: 6217 0
Bit Errors: 0 0
Total ES: 0 0
Total SES: 0 0
Total UAS: 87 0

And this after a few hours, my line became stable again once more.
Fucking hate Bell….

Hope this help people who got DSL service.
Xitij

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