I have separate pages that explain what maxdsl
is and how
maxdsl works,
this page is just a record of my own personal experience.
The Reality.
So how does maxDSL perform in real life? I've been able to monitor 2 lines
and get stats from each of them.
Both lines were dslmaxed on the 25th
of April. Ironically it was anticipated that line 2 would have the most difficulty
with adsl since this line is a few miles from the exchange and once told
it was only capable of 512kbps.
Line 1
Is very close to the exchange and has always had good line stats
and should be capable of far more than 8Mb speeds.
Yet it was this
one that got stuck with a 2Mb bRAS profile. :/
BTw also decided to carry out some Planned Engineering Works on the
exchange during the early hours of 11th May. Once the line came back
up, it was stuck with a 2Mb profile, which took an awful
lot of ticket tennis between my ISP and BTw to get resolved.
However, since this work has been carried out, latency and speeds are
very good.
Sync Speeds and SNR margin is rock steady.
Best speed seen off peak, is 907.64 KB/sec (7261.12 kbps). Peak time speeds
are variable around the 4 Mbps mark.
.
Line 2
One month on it still continues to hold on to sync at the full 8Mb, even though
the line on occasion has reached negative SNR Margins. This line picked
up its correct Data Rate after day 3. SNR Margin fluctuates vastly
during certain times of the day, although it is now suspected that
this may perhaps be down to some one switching something electrical
on at certain times of the day since it isn't a gradual decline, but
a rapid decline and back up again normally during the evenings. The
root cause as yet hasn't been discovered.
Latency on the line is good, but speeds at both peak and off peak are
not quite as good as on line 1 which is probably down to exchange congestion.
Average Off peak speeds around 5-6Mb, Average Peak speeds 3Mbps.
Line One
|
|
Line Two |
Pre-maxdsl stats
| |
SAR110 |
V2100 |
| Local Line Atten.: |
9.5 dB |
7.0 dB |
| Remote Line Atten.: |
7.0 dB |
6.5 dB |
| Local SNR Margin: |
31.0 dB |
30.5 dB |
| Remote SNR Margin: |
29.0 dB |
27.0 dB |
|
|
Pre-maxdsl stats
| Atten Down.: |
37.5 dB |
| Atten Up : |
22.0 dB |
| SNR Margin Down : |
21.4 dB |
| SNR Margin Up : |
30.0 dB |
SNR Margin can and does vary throughout the day. |
Router - BT Voyager 2100 + Solwise SAR110 - although
the SAR gives worse line stats the SAR110 was used to be able to
use snmp/mrtg stats.
|
|
Router - Netgear DG834G
All credit to this router - look at it go. The line frequently
drops to 0dB but still it holds in there.
|
maxdsl stats
| Local Line Atten.: |
9.5 dB |
| Remote Line Atten.: |
7.0 dB |
| Local SNR Margin: |
9.0 dB |
| Remote SNR Margin: |
20.0 dB |
|
|
maxdsl stats
| Atten Down.: |
39.0 dB |
| Atten Up : |
22.0 dB |
| SNR Margin Down : |
6.0 dB |
| SNR Margin Up : |
26.0 dB |
|
 |
|
 |
Observations
Short line - Little fluctuation in SNR - no notable errors.
This line was stuck on the dreaded 2Mb bRAS profile for longer
than the 3 days.
This line has had more or less rock solid line stats for 3
years, but interestingly the SNR Margin started to drop 3 days
before it was max enabled.
|
|
Observations
This particular line was once told it couldn't get more than
512kbps. With the help of MrS from adsl-guide to change the
BT database it achieved a solid 2Mb connection. Anticipated
maxDSL speeds in the region of 4Mb.
bRAS profile set on day 3.
Obvious SNR fluctuations. |
Result - Full 8Mb as anticipated. Max speed seen 7.10Mbps. |
|
Result Full 8Mb - probably due to the Netgear. |
Pre-max stats
Which one would you believe?.. bearing in mind I can
look out of my window and see the exchange.
All these tests were done from the same phone socket
- although it doesnt make any difference from the main to extension.
On
2Mb (SAR 110)
Local Line Atten.: 21.5 dB
Remote Line Atten.: 7.0 dB
Local SNR Margin: 31.0 dB
Remote SNR Margin: 26.0 dB |
On
1 Mb (SAR 110)
Local Line Atten.: 21.5 dB
Remote Line Atten.: 7.0 dB
Local SNR Margin: 35.0 dB
Remote SNR Margin: 26.0 dB
|
From a Netgear
DG834G
Connection Speed 2272 kbps 288 kbps
Line Attenuation Down: 12 db
Line Attenuation Upstream: 4 db
Noise Margin Down: 31
db
Noise Margin Upstream: 29 db
|
From Woosh (SAR
110)
Circuit Information: Circuit In Sync
Upstream xDSL Link Info : Loop Loss 6 dB
Cell Count 634759003
Downstream xDSL Link Info : Loop Loss 21 dB
Cell Count -1759228216
|
| From Voyager
2100 |
Down |
Up |
| |
|
|
| SNR (dB): |
30.5 |
27.0 |
| Attn(dB): |
7.0 |
7.0 |
| Pwr(dBm): |
15.0 |
11.9 |
| Max(Kbps): |
10624 |
1144 |
| Rate (Kbps): |
2272 |
288 |
| |
|
|
|
From Woosh (V2100) 8-8-05
xDSL Status Check OK
Circuit Information
Circuit In Sync
Upstream xDSL Link Info
Loop Loss 6 dB
Cell Count 691654368
Downstream xDSL Link Info
Loop Loss 7 dB
Cell Count -1373046627
|
From SAR 110
(with firmware VIK-2.1.040311a)
Local Tx Power: 11.95 dB
Remote Tx Power: 17.55 dB
Local Line Atten.: 9.5 dB
Remote Line Atten.: 7.0 dB
Local SNR Margin: 30.5 dB
Remote SNR Margin: 26.0 dB
|
WOOSH test (SAR110)
Upstream xDSL Link Info
Loop Loss 6 dB
Margin 19 dB
Errored Seconds 0
HEC Errors 0
Cell Count 589949220
Speed 448 k
Downstream xDSL Link Info
Loop Loss 9 dB
Margin 10 dB
Errored Seconds 0
HEC Errors 0
Cell Count 2013098949
Speed 8128 k
|
From SAR 110
25/04/06
| Local Tx Power: |
11.95 dB |
| Remote Tx Power: |
17.69 dB |
| Local Line Atten.: |
9.5 dB |
| Remote Line Atten.: |
7.0 dB |
| Local SNR Margin: |
9.0 dB |
| Remote SNR Margin: |
20.0 dB |
|
|
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