DMT Modem Tool v7.18 is out

added: DMT-Server update (v0.75)

added: LineQuality ADSLv1 AnnexA (avg. noisemargin / grey bars) ; High/Low SNR Margin

added: attenuation downstream @300kHz and @1000kHz (only Annex B / T-Com Kontes-Orka)

added: estimated loop length calculation (in meters)

Just gets better and better

Edited by JinxterX2 (Sat 10-Jun-06 22:16:11)

Someone's a busy little bee

DMT Tool v7.19 is out

added: ability to set modemoption-values "on BIT base" (experimental area / modify-checkbox must be ticked) 

added: ability to enable or disable Bitswapping 

fixed: Telnet-Session Keep-Alive dont work if DMT-window lose focus

Anyone had a play yet with the "on BIT base" enable or disable Bitswapping options yet? I meant to try them on the weekend but didn

Just noticed a post by EddieZ who is presumably associated with the tool development
http://forums.whirlpool.net.au/forum-replies.cfm?t=422001&p=-1#bottom

Ok I need some help if you willing please.

my initial sync rate was I think 6292 and stable during the day.

then after about 11pm I had a desync and I think I had one earlier as well.

sync dropped to under 5700

I put in adsl faceplate and dumped the filter then sync went up to just over 6000, updated to that new firmware and now sync 5952

the snr ratio confuses me but I believe mine is very low and hence my desynchs.

speedtouch 546

Downstream Upstream
Margin [dB] : 6.5 21.0
Attenuation [dB] : 51.0 31.0
OutputPower [dBm] : 19.5 11.5

Available Bandwidth Cells/s Kbit/s
Downstream : 14037 5952
Upstream : 1056 448

Channel Mode : fast

basically I want to stabilise the line and ideally have no speed loss or just little speed loss

am I right my snr is 6.5db so already very low?
if so how do I raise it using dmt tool?
what affect is interleaving likely to have on my line?

edit - to add I ran the snr monitor interval for around 20 mins and the bottom graph was fluctuating upto 10 I think meaning 10%.

http://www.chrysalisnet.org/dmt230606_0036.png

thanks

Edited by Chrysalis (Fri 23-Jun-06 00:36:38)

Raise the slider for Target Noise Margin bit by bit and observe what happens, if the resyncs stop, leave it at that setting. Dunno much about Interleaving apart from it adds some latency, so if you're a gamer you probably don't want that.

Edited by JinxterX2 (Fri 23-Jun-06 02:12:34)

ok this is what I done.

woke up checked adsl info, 109 resynchs over 5 hour period.

did you notice all the gaps on right side of middle graph in my frequency, whats that about? I defenitly dont see it on my freiends graph or on yours and you see where there is no gaps the db is at least 4 higher then average number worked out.

anyway I raised it as you said but lost a 1000kbit synch for a snr boost to 12db so lower it a little and now got 8.5 to 9db synch with a 5600 synch about 400kbit lost.

note this is daytime synch now at 10am the snr was exactly the same as last night on your graph with 3 lines plotted your snr is higher in the day shouldnt that happen for me as well?

should i ask my isp to enable interleave or leave on fast?

my adsl faceplate has a sky filter in the phone side is this possibly affecting the adsl? eg. i could put a phone extension in the sky side so the filter is nowhere near the adsl cable.

so now I have about 2-3 snr added and will see if stable like you said. please comment on my above points if you have any ideas thanks.

great help you have been and src of knowledge

just had another loss of synch

Try running ADSLMonitor to see what the error rates are like.
My problem is that with a long and noisy (at night) line I can get a high peak error rate causing a resynch even with an snr up at 12db