Low SNR early signs of a fault?
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- Low SNR early signs of a fault?
Low SNR early signs of a fault?
13-07-2017 6:19 AM - edited 13-07-2017 6:25 AM
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DLM dropped my connection twice last night, second time SNR dropped from 6 too 3. When that happened on my old DSL connection it was always a phone line fault was the cause, but not sure if its true for fibre or if my connection is just that good. Using a Billion 8800NL so hopefully its able to hold the connection on 3 SNR
edit: forgot to say already done a couple of quiet line tests over 15mins trying to catch any hissing but none
Downstream | Upstream | |
Line Coding (Trellis) | On | On |
SNR Margin (dB) | 2.8 | 4.8 |
Attenuation (dB) | 20.6 | 0.0 |
Output Power (dBm) | 13.0 | 6.6 |
Attainable Rate (Kbps) | 63352 | 18838 |
Rate (Kbps) | 74380 | 20000 |
B (# of bytes in Mux Data Frame) | 239 | 236 |
M (# of Mux Data Frames in an RS codeword) | 1 | 1 |
T (# of Mux Data Frames in an OH sub-frame) | 22 | 5 |
R (# of redundancy bytes in the RS codeword) | 0 | 16 |
S (# of data symbols over which the RS code word spans) | 0.1027 | 0.3771 |
L (# of bits transmitted in each data symbol) | 18696 | 5410 |
D (interleaver depth) | 1 | 1 |
I (interleaver block size in bytes) | 240 | 255 |
N (RS codeword size) | 240 | 255 |
Delay (msec) | 0 | 0 |
INP (DMT symbol) | 0.00 | 0.00 |
OH Frames | 0 | 0 |
OH Frame Errors | 113567 | 2438 |
RS Words | 0 | 1858287 |
RS Correctable Errors | 0 | 20 |
RS Uncorrectable Errors | 0 | 0 |
HEC Errors | 390541 | 0 |
OCD Errors | 12 | 0 |
LCD Errors | 12 | 0 |
Total Cells | 777843408 | 0 |
Data Cells | 5488962 | 0 |
Bit Errors | 0 | 0 |
Total ES | 48762 | 2310 |
Total SES | 87 | 6 |
Total UAS | 160 | 231239 |
Re: Low SNR early signs of a fault?
13-07-2017 7:58 AM
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Your connection may have dropped and re-synced at a target noise margin of 3dB instead of 6. This would be an indication that DLM sees your connection as stable and able to cope with a lower target SNR margin, thus giving you an increased line speed.
Re: Low SNR early signs of a fault?
13-07-2017 11:23 AM
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Nothing to be concerned about unless you do start to have issues, @maranello is accurate in their response.
Re: Low SNR early signs of a fault?
13-07-2017 6:16 PM
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Considering that the attainable rate figure is much lower than the current line rate, it looks like the 2.8 dB current SNRM is lower than whatever the target SNRM was, so it probably connected when there was less noise present.
Re: Low SNR early signs of a fault?
13-07-2017 7:42 PM
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This used to be the norm that if your line managed a long uptime it automatically changed from 6 to 3.
But I assume this has more to do with BT's rumoured experiment of dropping everyone to 3 if their line stands a chance of maintaining it.
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