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Author Topic: bit-loading is this normal line ?  (Read 5806 times)

yousaf465

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bit-loading is this normal line ?
« on: September 02, 2013, 06:53:49 AM »



Is this line ok ? 
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roseway

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Re: bit-loading is this normal line ?
« Reply #1 on: September 02, 2013, 07:14:37 AM »

I've never seen anything like that. My guess would be that you're on a short line with very little interference and the speed is heavily capped to much less than it's capable of. What do your general stats look like?
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kitz

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Re: bit-loading is this normal line ?
« Reply #2 on: September 02, 2013, 08:39:31 AM »

As eric has already pointed out, its hard to say without the linestats as well.

That graph doesnt show the full range across all adsl2+ tones...  but from the bit loading I can see, the line will likely only be syncing at a few Mbps suggesting it is capped by your ISP/DSLAM... so Id hazard a guess that you are on a 2Mb profile even though your line is capable of much more.

There looks to be a bit of noise around tone 310 possibly a local radio station?  Its only disturbing a few kbps though, which is no doubt made up elsewhere across the tones so its not affecting your overall condition.
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yousaf465

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Re: bit-loading is this normal line ?
« Reply #3 on: September 02, 2013, 08:49:32 AM »

current stats.
Quote
DSLAM/MSAN type:   BDCM:0x6294 / v0x6294
DSL mode:          ADSL2+
Status:            Showtime
Uptime:            2 hours 25 min 13 sec
         
            Downstream   Upstream
Attenuation (dB):          9.0      6.7
Connection speed (kbps):   6023      1239
SNR margin (dB):           50.9      6.5
Power (dBm):               12.4      12.3
Interleave depth:          64      4

RSCorr/RS (%):                   
RSUnCorr/RS (%):           0.0000      0.0000
ES/hour:                   0      0
INP:                       2.00      0.50




Quote
xdslctl info --stats
xdslctl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason:    1
Last initialization procedure status:   0
Max:    Upstream rate = 1247 Kbps, Downstream rate = 28552 Kbps
Bearer: 0, Upstream rate = 1239 Kbps, Downstream rate = 6023 Kbps

Link Power State:       L0
Mode:                   ADSL2+
TPS-TC:                 ATM Mode
Trellis:                U:OFF /D:ON
Line Status:            No Defect
Training Status:        Showtime
                Down            Up
SNR (dB):        50.9            6.4
Attn(dB):        9.0             6.7
Pwr(dBm):        12.4            12.3

Can I use 6mbps or 8bmps on this line ?



and this was the situation before the fix



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yousaf465

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Re: bit-loading is this normal line ?
« Reply #4 on: September 02, 2013, 08:56:14 AM »

As eric has already pointed out, its hard to say without the linestats as well.

That graph doesnt show the full range across all adsl2+ tones...  but from the bit loading I can see, the line will likely only be syncing at a few Mbps suggesting it is capped by your ISP/DSLAM... so Id hazard a guess that you are on a 2Mb profile even though your line is capable of much more.

There looks to be a bit of noise around tone 310 possibly a local radio station?  Its only disturbing a few kbps though, which is no doubt made up elsewhere across the tones so its not affecting your overall condition.

My profile is 4Mb and I'm using IPTV so 2Mb overhead.

Local radio station ? any particular frequency bcz I don't have radio station broadcasting station near my location, but I do have a solar panel in my house.  wire connecting the panel and charge controller cross telephone wire.
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roseway

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Re: bit-loading is this normal line ?
« Reply #5 on: September 02, 2013, 09:52:51 AM »

Those stats confirm that you're on a very short line, and if the connection wasn't capped at all you could get a downstream connection speed of well over 20 Mbps (probably the ADSL2+ maximum, 24 Mbps).

The hole around tone 310 is of little or no consequence, and it certainly isn't affecting your speed at the moment. These gaps are often caused by medium wave radio stations, but there are many other possible causes. If there isn't any likely local source of interference at this frequency, then it's probably not worth trying to locate it.
« Last Edit: September 03, 2013, 07:18:10 AM by roseway »
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yousaf465

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Re: bit-loading is this normal line ?
« Reply #6 on: September 03, 2013, 03:43:09 AM »

thanks

Problems returns
what might be cause of these spikes ? 


Bitloading graph



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yousaf465

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Re: bit-loading is this normal line ?
« Reply #7 on: September 05, 2013, 07:18:49 AM »

how do guys interpret this

« Last Edit: September 05, 2013, 07:23:17 AM by yousaf465 »
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roseway

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Re: bit-loading is this normal line ?
« Reply #8 on: September 05, 2013, 07:35:04 AM »

The chart would be better if you change the "Pixels per tone" value so that the full tone range can be seen. But the part which can be seen is obviously very unusual. The large empty section could be the result of interference in those frequencies, but the flat line SNR over that section makes me think that it's probably another consequence of the heavy capping which your connection is subject to.
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  Eric

kitz

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Re: bit-loading is this normal line ?
« Reply #9 on: September 05, 2013, 06:13:13 PM »

I agree with eric...  that flat line in the unused tones is highly unusual.   Youd expect the SNR to be higher in those regions.. not flatlined which indicates some sort of restriction being applied.  ???
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yousaf465

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Re: bit-loading is this normal line ?
« Reply #10 on: September 06, 2013, 02:03:34 AM »

The chart would be better if you change the "Pixels per tone" value so that the full tone range can be seen. But the part which can be seen is obviously very unusual. The large empty section could be the result of interference in those frequencies, but the flat line SNR over that section makes me think that it's probably another consequence of the heavy capping which your connection is subject to.
which value I should choose from 1 2 or 3 ?
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roseway

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Re: bit-loading is this normal line ?
« Reply #11 on: September 06, 2013, 07:29:51 AM »

Quote
which value I should choose from 1 2 or 3 ?

Just select one and see what happens. It changes the horizontal resolution of the graph.
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  Eric
 

anything