What is line attentuation and noise?


	What is line attentuation and noise?	View full version
User #76719 297 posts Maz Forum Regular	Ive gone on my router status and diagnostic program and im trying to find out whether my connection is good or not. What is an ideal attentuation and noise margin figure? I also pinged my iiNet server dns and im not sure how long is too long? Do I need to put a adsl filter from my modem to phone line? theres no other device going into that pone socket. my other socket has a filter for the phone	anchor posted 2005-Nov-26, 4pm AEST
User #55783 228 posts Lowkey Forum Regular	How about posting the figures you are getting in here so we can have a look. Also, you need to tell us where you're located so we can give you feedback on latency.	anchor posted 2005-Nov-26, 4pm AEST
User #62285 594 posts 61se7en Whirlpool Enthusiast	Maz writes... Do I need to put a adsl filter from my modem to phone line? theres no other device going into that pone socket. my other socket has a filter for the phone no you don't need a filter on your modem, only any phone/fax sockets your using ps if you have a alarm that call out or even foxtel digital you will need to consider more filters or just get a central splitter installed and not need to worry about filters at all	anchor posted 2005-Nov-26, 5pm AEST
User #75814 2864 posts Manatoba Whirlpool Forums Addict	In simple terms, line attenuation refers to how the signal gets "quieter" the further along a length of cable it goes, as power is lost along the way. For a rough estimate, you can count on approx. 13dB loss per kilometre of cable length (it's actually like 13.63dB for a certain guage Telecom wire under ideal circumstances). With noise on the line, it becomes harder for the "listener" to pick the good signal from the noise, and you may get constant line dropouts (modem loses sync' and has to reconnect) if the noise is really bad. Also, as mentioned in replies above, there should be no filter between modem and the phone socket. The filters are used to remove the high frequency signal off the line when going to phone/fax etc.	anchor posted 2005-Nov-26, 5pm AEST
User #55762 4474 posts the penguin Whirlpool Forums Addict	after getting the shits and calling 132258 last sunday to complain about my never ending DSL dropouts i think iiNet changed my DSLAM port to the "stability profile" which results in a lower but more stable sync. my sync has dropped from 12.28/1 to 7.5/.7 what i dont understand is that following this change my downstream attenuation figure dropped from 36 to 31.5 and my S/N Margin increased from 12 to 15.5. the upstream figures remained the same. can anyone explain this, or is my modem telling me fibs?	anchor posted 2005-Nov-26, 5pm AEST
User #97705 1938 posts Fast is good Whirlpool Enthusiast	joe onemillion writes... what i dont understand is that following this change my downstream attenuation figure dropped from 36 to 31.5 and my S/N Margin increased from 12 to 15.5. Joe, ADSL2 (and 2+) use more "buckets" or frequencies than ADSL1 (About twice as many) Attenuation reported is signal attenuation not line attenuation. As the number of frequencies in use has decreased so has the amount of noise contained in those "buckets" - same noise per bucket but less buckets so more S/N and the frequencies used give better transmission (hence lower signal attenuation) Nope modem isn't telling fibs (That's why Telstra like ADSL1 at 1.5 meg it has low attenuation and high S/N ----- therefore reliable) Edit: for the technical purists I know I've taken some liberties with the above explanation in the interests of keeping it simple!!	anchor posted 2005-Nov-26, 6pm AEST edited 2005-Nov-26, 6pm AEST
User #22504 229 posts andrewz Forum Regular	Downstream Upstream SNR Margin 14.7 12.0 dB Line Attenuation 23.2 14.5 dB Errored Seconds 896 1437 Loss of Signal 19 19 Loss of Frame 0 0 CRC Errors 0 4 Data Rate 7616 896 kbps Latency INTERLEAVED INTERLEAVED The above is from my Netcomm adsl modem. my SNR for downstream is between 9-15. This probably is the reason why I got many drop outs. I am on iidslam. If I upgrade my modem to adsl2 modem like billion or belkin, will the connection will be improved? any ideas? thanks. andrew	anchor posted 2005-Nov-26, 7pm AEST
User #97705 1938 posts Fast is good Whirlpool Enthusiast	Hi Andrew, Don't know the modem but considering your attenuation is relatively low your S/N is poor. And the fact that it varies so much is also concerning. 1 or 2 db variation is not unusual but 6db is very high. Have you done an isolation test (just the modem plugged in- no phones, alarm system, foxtel or anything else). I would be surprised if the variation in noise on your line was on the Telstra cables but it is possible if you are in a very noisy area or you have old cables with crappy joints etc.... Once the S/N drops much below 9db you will lose sync and if you have seen the S/N vary from 9 to 15 it probably goes lower from time to time.... I'll leave it to someone who knows the modem to give you any suggestions re improving your current situation. It is unlikely that a higher speed connection (ADSL2 or 2+) will improve things (probably be even less reliable) but a new modem/router may give you a more stable line if configured to G.DMT (ADSL1).... at about the same speed as you have now. I'd first try an isolation test if you haven't already done so.	anchor posted 2005-Nov-26, 8pm AEST edited 2005-Nov-26, 9pm AEST
User #38884 1401 posts superviza Whirlpool Enthusiast	Dont mean to hijack, however, i have always wanted to get peoples opinion on my line attenuation and S/N. My exchange is getting blue and going active 06/12/05 (mosman exchange) so i would like to see if my line figures look good for 12mbit. DSL Status: UP DSL Modulation Mode: GDMT DSL Path Mode: FAST Downstream Rate: 1536 Kbps Upstream Rate: 256 Kbps Downstream Margin: 29 db Upstream Margin: 24 db Downstream Line Attenuation: 21 Upstream Line Attenuation: 13 Downstream Transmit Power: 0 Upstream Transmit Power: 0 These stats are from a Linksys AG241 Thanks !!!	anchor posted 2005-Nov-26, 9pm AEST
User #83455 1364 posts pbee103 Whirlpool Enthusiast	can someone please tell me what these results mean and if it is a good or bad connection: SNR Margin: 17db downstream 29db upstream Line Attenuation: 43db down 26db up Data Rate: 1536kbps down 64kbps up thankyou	anchor posted 2005-Nov-26, 9pm AEST edited 2005-Nov-26, 10pm AEST
User #97705 1938 posts Fast is good Whirlpool Enthusiast	./kaid -c kaid.conf writes... My exchange is getting blue and going active 06/12/05 (mosman exchange) so i would like to see if my line figures look good for 12mbit. Your figures look very good---- it's impossible to say what your top speed would be (hard to compare Telstra DSLAM and iiSLAM as they use different output power) but my guess is you will get a significant speed gain.... possibly (now don't quote me!!!!) towards the top end of the speed range......	anchor posted 2005-Nov-26, 11pm AEST
User #97705 1938 posts Fast is good Whirlpool Enthusiast	pbee103 writes... can someone please tell me what these results mean and if it is a good or bad connection: I'll have a try! SNR Margin: 17db downstream 29db upstream You have relatively a low signal to noise on the downstream data but really good on upstream (higher is better).... Line Attenuation: 43db down 26db up Again the loss of signal (attenuation) downstream is very high whilst the upstream is reasonable....... (lower is better). How far are you from the exchange? As you are running 1.5 meg (presumably from a Telstra DSLAM) the high attenuation and low signal to noise would potentially limit your top speed on a ADSL2 service --- it's not easy to determine as the Telstra and other ISP's ADSL2 equipment operate at different signal levels. These levels are fine for ADSL1.	anchor posted 2005-Nov-26, 11pm AEST
User #55762 4474 posts the penguin Whirlpool Forums Addict	fast is good writes... Nope modem isn't telling fibs thanks, so your ADSL1 and ADSL2 S/N Margins and Attenuation figures will be different despite being delivered from the same DSLAM port via the same copper cable/filters etc to the same modem. interesting.. i guess you learn something new every day (and forget four things!)	anchor posted 2005-Nov-27, 9am AEST
User #75356 751 posts oldman Whirlpool Enthusiast	Maz writes... What is an ideal attentuation and noise margin figure? The following may help. It is not my research but was posted some weeks ago by someone whom I neglected to identify. Noise Margin (AKA Signal to Noise Margin or Signal to Noise Ratio) Relative strength of the DSL signal to Noise ratio. The higher the number the better for this measurement. In some instances interleaving can help raise the noise margin to an acceptable level. 6dB or below is bad and will experience no synch or intermittent synch problems 7dB-10dB is fair but does not leave much room for variances in conditions 11dB-20dB is good with little or no synch problems* (but see note below) 20dB-28dB is excellent 29dB or above is outstanding * Note that there may be short term bursts of noise that may drop the margin, but due to the sampling time of the management utility in your modem, will not show up in the figures. Line Attenuation Measure of how much the signal has degraded between the DSLAM and the modem. This is largely a function of the distance from the exchange. The lower the dB the better for this measurement. 20dB and below is outstanding 20dB-30dB is excellent 30dB-40dB is very good 40dB-50dB is good 50dB-60dB is poor and may experience connectivity issues 60dB or above is bad and will experience connectivity issues DSL Rate ***/tx/rx/Rate The actual service data rate that your ISP has provisioned. Attainable Line Rate This is the maximum rate at which your modem can connect to the DSLAM if there was no service provisioning limiting the bandwidth. The higher the number the better. Occupancy Occupancy is the percentage of line capacity used. Each DSL line is capable of a certain maximum speed or "capacity" dependant on line distance and other varying factors. The occupancy is an expression of your current sync rate setting over your maximum capacity. There are occupancy rates for both upload and download. The lower the figure, the better. Because of error correction and other factors in the DSL protocols, a margin is required so that a connection can be maintained under varying line conditions. If the occupancy approaches 100%, any interference can cause the ADSL sync to be lost. A useful measurement to monitor when sync problems occur. [AFAIK the billion SNMP utility does not give a direct measurement of occupancy :-( ] (with due acknowledgment of the other sources/forums that this info was gleaned from)	anchor posted 2005-Nov-27, 9am AEST
User #97705 1938 posts Fast is good Whirlpool Enthusiast	oldman writes... The following may help. It is not my research but was posted some weeks ago by someone whom I neglected to identify. Excellent explanation of the terms and what they mean! I would add to that the S/N figure will drop and the Attenuation will increase as the connection speed goes up..... The router and DSLAM negotiate the highest speed connection whilst maintaining the S/N at about 9db/9db or higher (unless the speed cap limits the maximum speed). * Note that there may be short term bursts of noise that may drop the margin, but due to the sampling time of the management utility in your modem, will not show up in the figures. Everyone seems to like using a car analogy so here goes! You are driving your Ferrari down the road at the maximum speed which is "safe" for the conditions..... suddenly there is a large "pot hole" in the road which you hit..... and crash! If you were driving more slowly then you could either swerve and miss the pothole altogether or you might hit it and go off course but not crash.... Same thing with the speed trade off! If you are getting lots of dropouts on ADSL2 then by dropping back to ADSL1 you will get far less.... possibly even no.... dropouts. So for those that like the speed the downside is lower reliability..... unless S/N is 20dB-28dB is excellent 29dB or above is outstanding and if you are lucky and fall into that group (I don't) then you don't have to worry about dropouts and resync....	anchor posted 2005-Nov-27, 1pm AEST
User #100957 231 posts captaincook Forum Regular	joe onemillion writes... what i dont understand is that following this change my downstream attenuation figure dropped from 36 to 31.5 and my S/N Margin increased from 12 to 15.5. the upstream figures remained the same. can anyone explain this, or is my modem telling me fibs? The attenuation figures from the modem are a measurement of the total power transmitted in all the subcarriers (buckets) compared to the received power in each direction. I am assuming stability profile is adsl1 which has an upper limit frequency of 1.1 Mhz as opposed to 2.2 Mhz for adsl2+. As these frequencies increase the attenuation increases every time you double the subcarrier(bucket) frequency there is 6dB more attenuation. The extra bandwidth is used for the downstream data, upstream bandwidth remains basically the same hence you would expect the downstream attenuation on the same line with adsl2+ to be greater than adsl1. As the attenuation is greater the level of the wanted signal at the receive end is less so the signal to noise ratio which is measured at the subcarrier frequencies (buckets) is lower with adsl2+. I would expect the attenuation and S/N figures you have to be typical of a change from adsl2+ to adsl1. The S/N figure can change independantly with adsl2+ as both ends have the ability to change transmit power levels to save power and reduce crosstalk especially when there is no traffic . Adsl1 runs fixed tx power. These figures will be different for every line as not all subcarriers (buckets) may be used due to noise,interference or attenuation on that frequency. This is why sync speeds are different on lines with the same attenuation. There are probably not 2 telephone lines in Australia with the same characteristics at adsl frequencies hence all the varying speeds and problems with adsl2+ and is probably why Telstra stayed with the 1500 limit. The copper network is in an abysmal state and they know it. Hope this helps	anchor posted 2005-Nov-28, 8am AEST
User #55762 4474 posts the penguin Whirlpool Forums Addict	yes it does :-) but it is going to take me a little while to wrap my brain around all that. time for a cup of coffee..	anchor posted 2005-Nov-28, 8am AEST
User #100957 231 posts captaincook Forum Regular	Joe Some sites that might make things clearer. www.aware.com/products/dsl/gdmt.htm home.flash.net/~gkawano/cs572/ cheers.	anchor posted 2005-Nov-28, 9am AEST
User #24953 43 posts Wildman Forum Regular	Should the line attenuation figures be similar for up and downstream? I have a netgear dg834 with 3.01.25 firmware on IInet ADSL2+ getting 11746 down and 1023kbps up. My down/up line attenuation is 32db/9db with my noise margin 7-9db/9db Any ideas for things I can do to drop my download line attenuation closer to my upload? Any reasons there would be such a large variance in different directions? I would like to get closer to the mythical 24Mbps! (I want speed)	anchor posted 2005-Dec-16, 3pm AEST
User #22504 229 posts andrewz Forum Regular	fast is good writes... I'd first try an isolation test if you haven't already done so. Hi, fast is good sorry I didn't check this thread until today. yes I did isolation test, then I update my modem to Billion 7402VGP, fit a C10 filter and changed a suspected electricity appliance switch and then my connection is very stable now, I now have connected for 2 days without drop, if it's not a power outage 2 days ago, it'll be near 4 days now. maybe worth to mention that I put code gain=0, because I feel this is more stable. here is my figure now: Downstream Upstream SNR Margin 5 17.0 dB Line Attenuation 22.5 14 dB Speed 975 kbps 8.45mbps as I use billion SNMP viewer, the line attenuation figure may swaped. The interesting thing is the SNR figure is only 5 after I set code gain =0, but seems very stable, why? I guess this is the real SNR before moden boost adsl signal. I am going to leave modem like this to see how long it will take before drop out. after that I may test deffierent profile to see what is the best for stability and speed combination.	anchor posted 2005-Dec-16, 6pm AEST
User #100957 231 posts captaincook Forum Regular	andrewz writes... as I use billion SNMP viewer, the line attenuation figure may swaped. The interesting thing is the SNR figure is only 5 after I set code gain =0, but seems very stable, why? I guess this is the real SNR before moden boost adsl signal. The S/N margin is negotiated during training from info from the dslam and is different for different modems(chipsets) with varying accuracy. At that negotiated figure the dslam is happy with the bit error rate. On your attenuation figures you would expect a better sync rate but your line looks noisy. After being upgraded to adsl2+ I have the same problem very noisy line and it caused errors and sync problems with my netcomm adsl1 modem nb1300 . I have upgraded to a adsl2+ dynalink RTA 1025w and it is a lot more stable. I have since upgraded to the thrillseeker profile and it is rock solid stable. There was no great speed increase 6720/896 to 8426/1023 but much more stable I chose this modem as it has the broadcom chipset which is from the same manufacturer as the chipset in the iinet dslams. Hope you have the same luck.	anchor posted 2005-Dec-16, 7pm AEST
User #54368 554 posts Rooshan Whirlpool Enthusiast	Oldman. Most enlightening post thanks for that. You have cleared the whole thing up. Thanks muchly.	anchor posted 2005-Dec-16, 7pm AEST
User #75356 751 posts oldman Whirlpool Enthusiast	Rooshan writes... Thanks muchly. Don't thank me. As I said it was not my original research. I regret that I don't know the name of the original researcher.	anchor posted 2005-Dec-16, 8pm AEST
User #70955 298 posts KngtRider Forum Regular	captaincook writes... The S/N margin is negotiated during training from info from the dslam and is different for different modems(chipsets) with varying accuracy. At that negotiated figure the dslam is happy with the bit error rate. It also varies between firmware revisions and wether someone has done any changes to the configuration of the service somewhow, for me it has changed several times with disctinct sets of snr/att values DG834v2 w/v3.01.25 firmware, PPoA, LAK NSW exchange, ADSL1 TW service ADSL Link Downstream Upstream Connection Speed 1536 kbps 128 kbps Line Attenuation 24 db 6 db Noise Margin 22 db 31 db The Downstream Noise Margin is dynamic and can be noticed with the polling interval of the modem status set to a low values and varies between 20 to 24 db, this behaviour appeared when the above values first came into effect about 5 months ago and in conbination with newer firmware. Since then downstream Attentuation has gone up and down a few db. It will probably change again when newer AR7 code is integrated into newer firmware releases. DG834 v3.01.25 contains the following TI AR7 drivers ATM Driver version:[4.05.03.00] DSL HAL version: [3.02.04.00] DSP Datapump version: [4.01.02.00] Annex A SAR HAL version: [01.07.02] PDSP Firmware version:[0.49] To show how much it can change, in April, the stats were (with either v1 or early v2 firmware) DS Line Attenuation: 27 DS Margin: 23 US Line Attenuation: 14 US Margin: 6 In march when I got the modem, the shipping v1.xx firmware gave ADSL Link Downstream Upstream Connection Speed 1536 kbps 128 kbps Line Attenuation 27 db 14.5 db Noise Margin 31 db 6 db Upgrade at the time to v2.xxx (beta) Connection Speed 1536 kbps 128 kbps Line Attenuation 27 db 7 db Noise Margin 25 db 6 db *Your results may vary !	anchor posted 2005-Dec-16, 10pm AEST
User #100957 231 posts captaincook Forum Regular	KngtRider writes... It also varies between firmware revisions and wether someone has done any changes to the configuration of the service somewhow, for me it has changed several times with disctinct sets of snr/att values I never implied that the S/N margin was fixed . It is determined on negotiation for certain bit error rate. The figure will be different for different modems firmware etc. Even 2 identical modems with the same firmware can come up with different figures. It only takes a different transformer characteristic to affect the figure. Naturally the noise on the line can be constantly varying with all sorts of spikes, crosstalk, wet weather, radio stations etc so the figure can change constantly. I had a dlink filter on one phone and when it rang it decreased the margin by 2 db and gave a burst of errors. Replacing the filter fixed that. You will find on adsl2+ the figure will be lower generally due to bandwidth and power management facilities depending on the dslam configuration . The tx powers at each end can be varied which can cause the figure to vary .	anchor posted 2005-Dec-17, 2am AEST
User #70955 298 posts KngtRider Forum Regular	Exactly, you hit the nail on the head. At first I was checking SNR quite regularly but now I do not even bother check s/n figures regularly any more, and what I though was a small issue with the connected phone seems to have disapeared over time. For reference purposes, the filter I am using is an OEM version of telequip dsl-008 [non e] that was bundled with the DG834 and seems to be already replaced with a newer version home.teegee.com.au/dsharoo/dsl008-e.jpg specs - old ver versus new ver	anchor posted 2005-Dec-17, 12pm AEST
User #104270 1 posts mrwul Forum Regular	Hello to you, Wud xDSL linestate up (downstream: 7999 kbit/s, upstream: 1021 kbit/s; output Power Down: 17.5 dBm, Up: 12.0 dBm; line Attenuation Down: 39.0 dB, Up: 19.5 dB; snr Margin Down: 8.5 dB, Up: 11.5 dB) be good number for an ADSL2+ 8mbit subscription? Thank you! rgds --	anchor posted 2005-Dec-18, 10pm AEST
User #106942 27 posts mad-scientist Forum Regular	Hi all, does anyone know if 4db SNR down is out of spec for a telstra line...ie: a line fault? im surprised that im still connected Cheers!	anchor posted 2006-Jan-21, 6pm AEST
User #106942 27 posts mad-scientist Forum Regular	its ok i found the answer thanx if im correct they like to work to 15dB min 10dB cheers:)	anchor posted 2006-Jan-21, 8pm AEST
User #20334 2358 posts CAMS Whirlpool Forums Addict	fast is good writes... 20dB-28dB is excellent 29dB or above is outstanding and if you are lucky and fall into that group (I don't) then you don't have to worry about dropouts and resync... Woohoo! SN Margin (Up/Down) [dB]:24,0 / 24,5	anchor posted 2006-Jan-22, 10am AEST
User #105928 9 posts Detramines Forum Regular	Hi , can anyone tell me whether the following is good or bad I use an Optus supplied 302G modem. Downstream Upstream SNR 34.0dB 24.0dB Attenuation 22.0dB 44.0dB DSL Connection rate 1536 Kbps 256 Kbps Thanks Shagz	anchor posted 2006-Jan-25, 4am AEST
User #115034 18 posts dansus72 Forum Regular	quote; Any ideas for things I can do to drop my download line attenuation closer to my upload? Any reasons there would be such a large variance in different directions? I would like to get closer to the mythical 24Mbps! (I want speed) its to do with the different frequencies at the up and down speeds, if you want more speed with netgears or linksys, do this; this is for the GT, think it works on the G too. Busybox, turn on debug mode > 192.168.0.1/setup.cgi?todo=debug, start telnet, 'open 192.168.0.1, type - 'adslctl info --stats to make sure your in adsl2+ mode, then type - 'adslctl configure --snr 70 70 being a percentage of the original SNR ie; 70% of 10db = 7b, or my case --snr 60 = 4.5db and +1.5mb.	anchor posted 2006-May-19, 12am AEST edited 2006-May-19, 12am AEST
User #50460 79 posts Brains Forum Regular	I've got a DG834 v1 (the older grey model, with the latest firmware) and I've just been switched on to TPG's ADSL2+. Whilst it had been a rock-steady performer on my old DSL1 1500/256 plan, with DSL2+ my link is all over the shop. Currently, the DG is telling me: ADSL Link: Downstream - Upstream Connection Speed: 16208 kbps - 1021 kbps Line Attenuation: 23 db - 6 db Noise Margin: 21844502 db - 8 db Obviously that huge noise margin figure is totally bogus, and the value varies with almost every refresh of the statistics! On one session, the downstream noise margin was stable at 4 dB (with a downstream speed of just over 12000 kbps) until the next reconnect (which lasted about 25 minutes). I'm not after mega download speeds, I don't do any bit-torrenting, I'm not after tight gaming pings -- all I want is a modest download speed, with my net up 24/7. I can't afford to replace the modem, which until now has given two years of sterling service. Would I be best off ringing TPG and asking them to have my circuit dropped back to ADSL2 or even ADSL1? I'd be very happy with 8M/1M, which is what I was told my DG would max out at when I signed up. Brains	anchor posted 2006-May-27, 4am AEST
User #56574 54 posts Ben Forum Regular	I have a DG834 v2 running firmware V3.01.29 (and previously v 3.01.25) I was recently upgraded from TPG 1.5mb (rock solid connection) to TPG ADSL2+ (very flakey) Typical stats when it’s working: ADSL Link Downstream Upstream Connection Speed 6139 kbps 640 kbps Line Attenuation 42 db 13 db Noise Margin 6 db 17 db Speed test: Mirror: TPG Test type: ADSL Your connection speed: kbps: 3334.03 KB/s: 416.75 Mbps: 3.33 When I lose internet connection: ADSL Link Downstream Upstream Connection Speed 6139 kbps 640 kbps Line Attenuation 42 db 13 db Noise Margin 2147483646 db 18 db Since I was upgraded to TPG ADSL2+ I am lucky to get a few hours of surfing in before I have to reset the router to resume connection. I have tried isolation tests and a few different filters with different combinations of phone connected and not, modem 10cm from plug - no other connections, etc. I live approximately radius 3km from exchange. I tried unplugging for 45 minutes and when it reconnected, it negotiated about 3500 kbs download 640 kbps upload, crashed, and then renegotiated 6139 kbps 640 kbps. Is it worth trying more filters or is the loss of sync something I just have to live with if I want to stick with ADSL2+? I never expected to be capable of getting ADSL2+ where I live, but I was "persuaded" into the new plan by TPG. Previously (TPG 1.5mb) loss of synch was rare (maybe reset router once every couple of weeks at worst) until I was "upgraded" to TPG ADSL2+. It is great to have the faster connection, but it’s too unreliable. Any feedback would be appreciated.	anchor posted 2006-Jun-12, 4pm AEST edited 2006-Jun-12, 4pm AEST
User #123568 149 posts Sky Soarer Forum Regular	This is the stats that i get from Billion Diagnostic - DSL Line Downstream relative capacity occupation: 100% noise margin downstream: 5.8 db output power upstream: 12.3 dbm attenuation downstream: 7.0 db carrier load: number of bits per symbol(tone) Upstream relative capacity occupation: 100% noise margin upstream: 10.1 db output power downstream: 19.3 dbm attenuation upstream: 6.1 db carrier load: number of bits per symbol(tone) Is this accurate? and this is what show in WAN Port Statistic Link Status: Up Upstream Speed: 1021 kbps Downstream Speed: 22245 kbps Downstream Speed: 22245 kbps <--- Is this like the max i will get if i upgrade my modem? Thanks in advance	anchor posted 2006-Jun-12, 4pm AEST
User #7289 7 posts Michael Specht Forum Regular	I have recently relocated to the Elwood, Vic exchange and up'ed my speed to 1.5m/256k and am now experiencing lots of drop outs. Just wondering if I have a line with too much noise? Using Nubz AlcaTool I have got the following stat's (All other phones unpluged, no Foxtel and no alarm):- Operational data report : near end (Downstream) ---------------------------------- ------------- Attainable line rate : 5520 kbit/sec Attainable Atm rate : 5056 kbit/sec Used line rate : 1868 kbit/sec Fast used Atm rate : 1536 kbit/sec Interleaved used Atm rate : 0 kbits/sec Rel. capacity occupation : 34 Noise Margin : 16 dB Line attenuation : 36 dB Output Power : 19 dBm If the noise is too much what can I do to resolve the issue?	anchor posted 2006-Aug-22, 8pm AEST
User #43003 891 posts Michael Sy Whirlpool Enthusiast	How is this for me? ADSL status shows the ADSL physical layer status. ADSL Firmware Version: 4.03.03.00 - 3.02.00.03 - 3.02.06.00 Annex A - 01.07.02 - 0.49 ADSL Software Version: V2.00B02.AU Line State Connected Modulation Multi-mode Annex Mode ANNEX_A Max Tx Power -38 dBm/Hz Item Downstream Upstream Unit SNR Margin 23 24 dB Line Attenuation 42 23 dB Data Rate 1536 256 kbps ?	anchor posted 2006-Aug-22, 10pm AEST
User #43003 891 posts Michael Sy Whirlpool Enthusiast	Hahahahaha everyones posted their shit on here but no one can read it! LOL	anchor posted 2006-Aug-22, 10pm AEST
User #55762 4474 posts the penguin Whirlpool Forums Addict	Michael Specht writes... If the noise is too much what can I do to resolve the issue? It's a noise margin. It's telling you that your signal is 16db louder than the nosie, which is good. If you look at ADSL2+, people try to achieve the lowest possible SNR margins, as the sync speed will increase as the SNR margins decrease. At 1.5/256 you shouldnt be getting any dropouts, unless there is a line fault. You should report the problem to your ISP.	anchor posted 2006-Aug-24, 7pm AEST
User #127512 126 posts adam t Forum Regular	OK I know this is a relatively old thread but I thought I'd add to it instead of creating a new one. Here's my problem, my current OG 1.5/256 connection drops out and reauths every couple of hours and someone suggested it might be a bad line. Are these vaules alright? I have absolutely no idea what any of these numbers mean, so I couldn't tell for myself :P Thanks in advance. ADSL Parameters Downstream Upstream SNR Margin 32.0 dB 8 dB Line Attenuation 15.5 dB 11.0 dB CRC Errors 27 0 Latency Fast Fast Oh yeah this is with the phone unplugged and nothing downloading.	anchor posted 2006-Sep-29, 10pm AEST edited 2006-Sep-29, 10pm AEST