Kitz Forum
Broadband Related => Broadband Hardware => Topic started by: Rahat on October 27, 2008, 03:27:26 PM
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Im with o2 broadband and i am currently using the speedtouch router given out by them. However, i just need to know if the router im about to get will increase sync speed and be stable at 3db.
http://www.dixons.co.uk/martprd/store/dix_page.jsp?BV_SessionID=@@@@1101651396.1225121013@@@@&BV_EngineID=cceladefidkjheicflgceggdhhmdgmk.0&page=Product&fm=null&sm=null&tm=null&sku=588895&category_oid=-32807
Also, does this router support DMZ as i need that for the PS3.
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I've just replaced a WAG354G which was pants with one of these and I'm very pleased with it, so far its been rock steady although its early days yet but I'm very hopeful. Make sure it has the latest firmware which is available from here (http://ftp://ftp.dlink.it/Adsl/DSL-2740B/Firmware/Ver2.61/EU_DSL-2740B_2.61b243.zip), and make sure you use IE to upload the firmware as it does not work with Firefox.
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I too have recently started using this router.
I use only ADSL however have a read here:-
http://www.beforum.co.uk/showthread.php?t=9182
That will allow you to set it up O2.
It does support DMZ, is this what you would need:-
http://i113.photobucket.com/albums/n217/jamieidavies/dsl2740b/dmz_2740b.png
It uses the Broadcom chipset like the Be / O2 exchange kit does so they should work together. As for increasing sync, it increased mine as soon as I connected from 6100 to 6800 until I used DMT to bring it to 8128.
The router is stable as long as you use the latest firmware as pointed out by broadstairs :)
The price there is a bit steep, have you ordered yet as it is cheaper here and free delivery is available:-
http://www.ebuyer.com/product/119456
As I say though, latest firmware will be vital as it adds the DMZ support ;)
*edit* was typing the same time as Kitz ;D
To add to Kitz comments on D Links, as she says, most issues have been with firmware (as I can tell you :-X)
However, there is now a beta firmware for this router to fix some of the WiFi issues available here:-
http://www.adsl2forum.co.uk/showpost.php?p=64435&postcount=5
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I'm afraid I have no personal experience of the D-link 2740B so I cant really say.
My past experience with d-links hasnt been the best - but thats more firmware stuff.. but I believe that d-link have pulled their finger out and are actually providing better routers these days.
My own opinion of the TG585v7 is not Good...
I had a brand new one.. which I think is now completely useless - I need to look at it properly to see if it is well and truely dead, or whether it just needs a "rest" - it blew last night. The one I had was using the standard ST firmware - not the Be one, but from what I gather, its a cheaper chipset and board than the previous v6's. It never synced as high as my old ST585v6 and I couldnt even ever get the full Annex M upstream on it for some reason. Also this line normally runs pretty steady with SNRM, but I kept seeing very weird fluctuations which I dont see with any other router.
I heard on the grapevine that Thomson specifically made the v7 on a budget for a certain UK ISP and it uses inferior parts. Thomson is the same company that also pandered to another UK ISP and removed some of the CLI functionality.
Ive raised 4 separate tickets to Thomson and they have never even bothered to respond to a single one.. so right now as far as Im concerned Thomson have gone downhill.
For my own personal line the old ST585v6 works best.. but coming a close 2nd is a flashed sky router (DG834GT) (http://www.kitz.co.uk/routers/skyDG834GT_flash.htm) bought cheap off ebay. On another (longer line) the sky dg834gt works better than the BeBox giveing it a boost of about 1Mbps and running steady.
Theres one router I'd personally like to get my mitts on right now to give it a test and thats one of these
http://www.netgear.com/Products/RoutersandGateways/WirelessNRoutersandGateways/DGN2000.aspx
Cant reply about DMZ Im afraid since I dont use it.
But according to the blurb here (http://www.laptopsdirect.co.uk/D-Link_RangeBooster_N_ADSL2-_Modem_Router_DSL-2740B_-_wireless_router_DSL-2740B/version.asp) it does - as does (http://www.amazon.co.uk/NETGEAR-DG834GT-Super-Wireless-Router/dp/tech-data/B0009N8OOC) the dg834gt
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My issue with choosing a router is that I need dynamic dns support, I dont run a web server but I need my web host to be able to talk to my local MySQL, and I like SNMP to monitor throughput from my lan to the internet to know if I'm getting close to any sort of cap. That's why I went for the D-Link. Netgears dont support either of these as far as I can tell. DMZ is quite a common feature I believe.
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So Jid, does this router allow me to save my current SNR settings or for every reboot do i have to readjust the SNR?
Also, currently with the Speedtouch that o2 give my Noise Margin is UP 4.0/ Down 1.5. (im on the 3db profile)
So if i get that D link router will it be more stable than the speedtouch and cope with the SNR and perhaps make sure it doesn't go down to 1.5 in the first place?
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Also, how do you upgrade the firmware on the d link? After you download the file and extract it a .cfk file come up. Then what do you do?
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>>So Jid, does this router allow me to save my current SNR settings or for every reboot do i have to readjust the SNR?
The settings will save if the connection drops out, however if you reboot the settings will return to their defaults.
>>Also, currently with the Speedtouch that o2 give my Noise Margin is UP 4.0/ Down 1.5. (im on the 3db profile)
So if i get that D link router will it be more stable than the speedtouch and cope with the SNR and perhaps make sure it doesn't go down to 1.5 in the first place?
That depends, the Be* equipment you are on the exchange is also Broadcom so it depends...actually hooking up the router will answer that one.
>>Also, how do you upgrade the firmware on the d link? After you download the file and extract it a .cfk file come up. Then what do you do?
To upgrade the firmware, you will need to:-
Maintenance Tab > Firmware update
Then browse the .cfk file (not zipped) and click the Upload button.
Make sure are using IE as it will not work otherwise.
The router will then tell you the progress.
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Ok thanks, so how would i use DMT if the settings will reset. For example, if i change the SNR Margin and then save settings i will have to restart the router to see changes and you said that the settings will be lost.
Also, how do i enable ADSL2+ on the router (setup)
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The router automatically figures the ADSL mode to use so no worries there...
This is where you adjust the SNR:-
http://i113.photobucket.com/albums/n217/jamieidavies/dsl2740b/snrpanel.png
When you click the Apply.Resync button, the router will resync automatically and DMT will show the status along the bottom.
Make sure you have enabled the extra tab though:D
http://i113.photobucket.com/albums/n217/jamieidavies/dsl2740b/miscopt.png
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Thanks mate.
Im sorry if im annoying you :(.
So basically, when i set up the router and upgrade the firmware etc all i have to do is open up DMT and use 192.168.1.1 and username and password is admin and admin as default? Or do i need to enable telnet or something on the router and if so where do i do it?
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Oh and the speedtouch router resyncs if the SNR drops below 1. So can the d-link handle 0.5 or perhaps keep it from dropping?
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>>So basically, when i set up the router and upgrade the firmware etc all i have to do is open up DMT and use 192.168.1.1 and username and password is admin and admin as default? Or do i need to enable telnet or something on the router and if so where do i do it?
As long as 2.61 firmware is there, DMT will work straight away:D
>>Oh and the speedtouch router resyncs if the SNR drops below 1. So can the d-link handle 0.5 or perhaps keep it from dropping?
That basically means that your line can't handle the SNR being low. The D Link may improve the stability it may not.
It maybe just that your line cannot handle the increased noise in the evenings...As I say, you won't be able to know how it performs until you connect it etc...
>>Thanks mate.
Im sorry if im annoying you :(.
Yw, don't worry, thats what we are here for:D
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Ok thanks for your help!
Im going to get the router soon and i will give you an update soon.
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Ok thanks for your help!
Im going to get the router soon and i will give you an update soon.
Did you check the ebuyer.com link. It is £9 cheaper:D
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http://i113.photobucket.com/albums/n217/jamieidavies/dsl2740b/snrpanel.png
on that DMT shot there are three adsl modes. Should i tick adsl2+ or not tick any?
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Don't tick any to start off.
The router should go to ADSL2+ straight away:D
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Ok my router just resynced again but now at 6.6 compared to the 7.6meg earlier. So might the D link stop this from happening and be able to handle the noise at peak times? Its roughly every day at 8PM when the router resyncs.
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Ok my router just resynced again but now at 6.6 compared to the 7.6meg earlier. So might the D link stop this from happening and be able to handle the noise at peak times? Its roughly every day at 8PM when the router resyncs.
I really can't say until you have the Router connected to the line ;)
With regard to the resyncs you are having, it seems that your line cannot handle the 3dB target noise margin :(
Leave it on until you get the D Link and then monitor it for a while, see how it goes, but whether it will improve or not is anyone's guess.
The advantage with the D Link is it uses a Broadcom chipset like Be* / O2 so there could be a chance of some improvement there....
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Hey, I want to know which firmware to use for the D link 2740B.
Should i use 2.61 or 2.73 (http://www.adsl2forum.co.uk/showpost.php?p=64435&postcount=5)
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Just downloaded 2.73 and have noticed that it isn't a .cfk file like 2.61 so do i install it the same way?
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It's a .bin file.
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Normally I'd recommend going to the latest official firmware offered by the manufacturer.
Sometimes Betas are released and if your sure of the source then you can give them a try.
I can't recall now which version jid used on his and whether it was the beta ones or not.
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So if i get the D Link will i be able to adjust the SNR to something like 3.2 or 3.5?
Im not at home but i can say that my speedtouch (With SNR of 3db) router syncs at 7.7meg in the morning and drops out and reconnects at 6.6meg in the afternoon. So if i can adjust the SNR to 3.2 or 3.5 with the dlink how much might the router sync at? (You guys are really good with your estimations!). Plus, i have noticed that the speedtouch cannot handle 0.5 SNR and as soon as it hits that point the router disconnects. So im hoping an SNR of 3.5 will add stability but not lose me much speed (if any).
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I believe you cannot set the SNR (actually SNR margin) all you can do is to ask the router to negotiate a lower SNR margin, all of this is a negotiation between router and the exchange equipment - you cannot force anything. Also from what I've read an SNR margin around 3 is unlikely to be stable, SNR margin will fluctuate and what you need to do is to get the router to negotiate a connection starts a an SNR margin which is low enough to give the best speed and still stay up if/when it drops off during certain periods. I doubt there are many (indeed any) router which would maintain a stable connection at 0.5 SNR margin its simply asking too much of the poor electronics to cope with a signal where it cannot tell noise from data.
Now I have currently 2.61 firmware on my 2740B and it is stable at present, the SNR margin varies from about 9 or just over at best to around 6 with the odd spike lower to about 3 at worst and so far its been running like this for just over 2 days with no disconnects. On my line it gives me 5774kbps downstream.
As with all of this stuff YMMV.....
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So if i get the D Link will i be able to adjust the SNR to something like 3.2 or 3.5?
Im not at home but i can say that my speedtouch (With SNR of 3db) router syncs at 7.7meg in the morning and drops out and reconnects at 6.6meg in the afternoon. So if i can adjust the SNR to 3.2 or 3.5 with the dlink how much might the router sync at? (You guys are really good with your estimations!). Plus, i have noticed that the speedtouch cannot handle 0.5 SNR and as soon as it hits that point the router disconnects. So im hoping an SNR of 3.5 will add stability but not lose me much speed (if any).
With regard to what the router would sync with different SNR targets, you would have to wait for her reply on that one I am afraid :-[
As for firmware, the only thing that 2.73 does is put the latest firmware for the Broadcom wireless chipset and nothing more, the official 2.61 is the one that adds lots of enhancements for the Broadcom ADSL as well as adding a few more features and a lot of fixes:D
You should see similar speeds with the D Link as you do now on the Speedtouch with a 3db target, however as you seem to be having drop outs I would say bringing that down anymore using DMT would be too much for your line (and the noise on it) to cope with. Kitz, would you agree?
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Normally I'd recommend going to the latest official firmware offered by the manufacturer.
Sometimes Betas are released and if your sure of the source then you can give them a try.
I can't recall now which version jid used on his and whether it was the beta ones or not.
I use 2.73 and have since I purchased, it sorted all of the PPP session issues I was having too, however Be/O2 don't use ppp so...
2.61 actually makes the DMZ work so that is vital for your sakes:D
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I believe you cannot set the SNR (actually SNR margin) all you can do is to ask the router to negotiate a lower SNR margin, all of this is a negotiation between router and the exchange equipment - you cannot force anything. Also from what I've read an SNR margin around 3 is unlikely to be stable, SNR margin will fluctuate and what you need to do is to get the router to negotiate a connection starts a an SNR margin which is low enough to give the best speed and still stay up if/when it drops off during certain periods. I doubt there are many (indeed any) router which would maintain a stable connection at 0.5 SNR margin its simply asking too much of the poor electronics to cope with a signal where it cannot tell noise from data.
Now I have currently 2.61 firmware on my 2740B and it is stable at present, the SNR margin varies from about 9 or just over at best to around 6 with the odd spike lower to about 3 at worst and so far its been running like this for just over 2 days with no disconnects. On my line it gives me 5774kbps downstream.
As with all of this stuff YMMV.....
With DMT, all you do is force the router to ignore the DSLAM/MSAN target snr and sync with its own (i think, correct if I am wrong)
I use DMT to bring my Target SNR to 6dB as they won't change it from 12dB.
The line syncs with the 6dB target and is more than fine.
You mention 3dB being unstable, well this would depend on the length and quality of the line, I believe from various forums that a lot of Be*/O2 customers have a 3dB Target SNR mainly because they want more speed.
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The recommended SNRM is 6dB. quite often lines need a lot more. afaik theres only Be that allow the 3dB Target SNR, and you need to be on a short and stable good line for that to work.
Most routers will start to get a bit shakey once the SNRM drops below 6dB... but the ones we recommend as being good will cope with speeds lower. As broadstairs says.. theres not many that will cope at 1dB.. some may remain connected - theres also a few that will go into -ve figures.. but the line quality at this level is likely to be very bad. You will be racking up lots of errors and packets that have to be retransmitted.
The re-requesting of packets is what makes the connection slow.
Therefore its just not worth running the SNRM very low because any increase in sync speed will be negated by re-transmits which may actually cause a slower throughput speed. The end result could well be a slower realtime speed and certainly latency problems, than if you hadnt bothered tweaking the SNRM down that low.
The SNR Margin is there for a purpose - to absorb any line fluctuations and allow for normal SNR fluctuations.
As regards to how much increase it will give you - I wouldnt really like to say, some some see 400kbps per dB.. some say 500kbps per profile stage (3dB).. it all depends on your line really. As always the shorter lines tend to fair best.
>> With DMT, all you do is force the router to ignore the DSLAM/MSAN target snr and sync with its own (i think, correct if I am wrong)
Depends on the router.. its basically called over-riding the one set on the DSLAM, by getting it to negotiate at a % OR at dBs lower than set.
IIRC You'll notice that some versions of DMT are different and some set at a % and some at dBs.. hence why you often have to play with the slider to find the right level.
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Because my current setting is 3db on the DMT tool will 100% be 3db?
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>>>>>As for firmware, the only thing that 2.73 does is put the latest firmware for the Broadcom wireless chipset and nothing more, the official 2.61 is the one that adds lots of enhancements for the Broadcom ADSL as well as adding a few more features and a lot of fixes:D
So should i update to 2.61 first and then to 2.73?
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>>> Because my current setting is 3db on the DMT tool will 100% be 3db?
yep :)
50% will be 1.5dB
200% will be 6dB
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>>So should i update to 2.61 first and then to 2.73?
You would be better off going for version 2.61 first yes, if you find the Wireless performance low, simply apply 2.73.
>>>> With DMT, all you do is force the router to ignore the DSLAM/MSAN target snr and sync with its own (i think, correct if I am wrong)
Depends on the router.. its basically called over-riding the one set on the DSLAM, by getting it to negotiate at a % OR at dBs lower than set.
IIRC You'll notice that some versions of DMT are different and some set at a % and some at dBs.. hence why you often have to play with the slider to find the right level.
With the DSL-2740B, you can go lower that the 10% max the slider provides by using a simple command:-
adslctl configure --snr 1
With the above, simply replace the 1 with any number 1-9 and that will bring it right down, in my case to 6dB target.
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With the DSL-2740B, you can go lower that the 10% max the slider provides by using a simple command:-
adslctl configure --snr 1
With the above, simply replace the 1 with any number 1-9 and that will bring it right down, in my case to 6dB target.
Well with my 2740B you can only issue an adsl configure command, adslctl does not exist.
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With the DSL-2740B, you can go lower that the 10% max the slider provides by using a simple command:-
adslctl configure --snr 1
With the above, simply replace the 1 with any number 1-9 and that will bring it right down, in my case to 6dB target.
Well with my 2740B you can only issue an adsl configure command, adslctl does not exist.
It does exist as it works no problems!
I used the debug in DMT and that is the command used by DMT to change the SNR!!
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With the DSL-2740B, you can go lower that the 10% max the slider provides by using a simple command:-
adslctl configure --snr 1
With the above, simply replace the 1 with any number 1-9 and that will bring it right down, in my case to 6dB target.
Well with my 2740B you can only issue an adsl configure command, adslctl does not exist.
It does exist as it works no problems!
I used the debug in DMT and that is the command used by DMT to change the SNR!!
Well all I can say is that I have telnet'd into my 2740B and issued the adslctl command and it comes up 'not found'. No way does this work at firware 2.61 in my 2740B, using adsl instead works perfectly. If you telnet into your router and issue help it should list all available commands and in mine it lists adsl but does not list adslctl. If you have a later fireware it is possible that this command could have been added.
I have used adsl configure --snr 9 to set my snr margin to 9 and it works fine. Bwe warned that changing this value will cause the router to drop the ink and retrain the link.
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With the DSL-2740B, you can go lower that the 10% max the slider provides by using a simple command:-
adslctl configure --snr 1
With the above, simply replace the 1 with any number 1-9 and that will bring it right down, in my case to 6dB target.
Well with my 2740B you can only issue an adsl configure command, adslctl does not exist.
It does exist as it works no problems!
I used the debug in DMT and that is the command used by DMT to change the SNR!!
Well all I can say is that I have telnet'd into my 2740B and issued the adslctl command and it comes up 'not found'. No way does this work at firware 2.61 in my 2740B, using adsl instead works perfectly. If you telnet into your router and issue help it should list all available commands and in mine it lists adsl but does not list adslctl. If you have a later fireware it is possible that this command could have been added.
I have used adsl configure --snr 9 to set my snr margin to 9 and it works fine. Bwe warned that changing this value will cause the router to drop the ink and retrain the link.
Aah, well I have 2.73, however both the commands work, I tried to get 6dB SNR with using 6, however it works the same as adslctl does:D
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Why does my attentuation go up and down? It was 40.0 before and now its 40.5.
Uptime: 0 days, 0:25:53
DSL Type: G.992.5 annex A
Bandwidth (Up/Down) [kbps/kbps]: 1,325 / 7,864
Data Transferred (Sent/Received) [kB/kB]: 0.00 / 0.00
Output Power (Up/Down) [dBm]: 12.0 / 18.5
Line Attenuation (Up/Down) [dB]: 21.5 / 40.5
SN Margin (Up/Down) [dB]: 4.0 / 3.5
Vendor ID (Local/Remote): TMMB / BDCM
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 0 / 0
Loss of Power (Local/Remote): 0 / 0
Loss of Link (Remote): 0
Error Seconds (Local/Remote): 1 / 0
FEC Errors (Up/Down): 29 / 84,676
CRC Errors (Up/Down): 29 / 169
HEC Errors (Up/Down): 1,956 / 121
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>> It was 40.0 before and now its 40.5.
Thats fine - normally youd it expect it stay around the same, but because the way attenuation is read by the router across all the frequency bins.. it is possible on occasions to see a tiny change. 0.5 is fairly common a change.
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Ah right, its actually the other way around (41 to 40.5). It caused the router to sync fast i think. Anyways, thanks guys. This forum is very informative and im learning alot!
Ok, so you see my down SNR is 3.5 but O2 set my SNR to 3b so in DMT is 100% still 3db?
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>>Ok, so you see my down SNR is 3.5 but O2 set my SNR to 3b so in DMT is 100% still 3db?
If I remember, Be*/O2 3dB target is actually 3.5dB so 100% should be 3.5dB , the default set at the DSLAM/MSAN
As for attenuation, the lower the shorty your line appears to the router/exchange equip, therefore the faster(ish) sync:D
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I guess the best way to find out is by testing.
First thing im going to try and do is make the SNR go up by 1 small tab and resync to see if the router doesn't drop.
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I guess the best way to find out is by testing.
Most certainly is:D
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The 3dB / 3.5dB thing is weird.
Be/o2 say officially its 3.5dB... but they also call it 3dB in some places.
Mines supposedly set at 3.5dB. yet even without tweaking I still can sync on occasions with it showing on my router as 3dB downstream, but the upstream will be 3.5dB
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Hi, i just ordered the router from here- http://www.broadbandbuyer.co.uk/Shop/ShopDetail.asp?ProductID=4158
I have two questions; number one: is this the right router lol and number two, http://www.adsl2forum.co.uk/showthread.php?t=9182 on that thread it says
'The latest firmware version 2.61 is available here from D-Link. This guide only applies to firmware versions 2.51 or better, prior versions required a more complicated process to set up. Upgrade to the latest firmware for bug fixes, the latest Broadcom modem code and easier setup on Be*.'
How do i go about doing this? The router hasn't come yet as i just ordered today. The guy says that i should upgrade the firmware before carrying on with the tutorial. However, how will i get to the router main page without sorting out the connection first? Should i just type in the ip number that's in the manual or would i need an internet connection to get to the page?
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-My bad, i think i asked way more than two questions :-[
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You can access the router using the IP address 192.168.0.1 to perform the actual firmware upgrade without having to have an internet connection.
However - you will need to download the firmware which does obviously need an internet connection, so make sure you download the updated firmware to your PC. Then when you start the firmware upgrade point it to where you have stored the upgrade file on the PC.
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Just to add that you should always do any firmware upgrade via a wired connection if you have one....
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Thanks for the tips/help. I'll let you know when i get the router and what it syncs at.
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Just to correct, the IP Address of the router is 192.168.1.1
(sorry to be fussy Kitz :-[ )
I would go ahead with downloading 2.61 as it has the exact same setup properties as shown in that setup guide.
Also make sure you use Internet Explorer for the upgrade as it won't work with Firefox...
Also you got a good price for the router there too! :)
Keep us updated on how it goes:D
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Will do mate!
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Hi everyone, i finally have the 2740b. I just setted it all up but im finding th statistics quite difficult as it's way more complex than then o2 router. Oh yeah, and i've updated the firmware to 2.61.
Downstream Upstream
Rate (Kbps) : 8188 1325
SNR Margin (dB) : 2.9 4.6
Attenuation (dB) : 40.5 21.4
Output Power (dBm) : 18.7 12.4
MSGc (number of bytes in overhead channel message) : 93 16
B (number of bytes in Mux Data Frame) : 76 37
M (number of Mux Data Frames in FEC Data Frame) : 1 1
T (Mux Data Frames over sync bytes) : 2 3
R (number of check bytes in FEC Data Frame) : 12 0
S (ratio of FEC over PMD Data Frame length) : 0.3233 0.9838
L (number of bits in PMD Data Frame) : 2202 309
D (interleaver depth) : 96 1
Delay (msec) : 7 0
Super Frames : 86478 86444
Super Frame Errors : 27 13
RS Words : 17122798 0
RS Correctable Errors : 9760 0
RS Uncorrectable Errors : 394 N/A
HEC Errors : 18 11
OCD Errors : 0 0
LCD Errors : 0 0
Total Cells : 26737694 4708885
Data Cells : 333128 40076
Bit Errors : 0 931
Total ES : 23 13
Total SES : 1 0
Total UAS : 73 63
Well, here it is lol. I got the dmt tool to work and just lowered the noise margin to 2.9 but when its about 12PM or so i'll up the noise margin and see whether or not i can keep the full 8188 sync.
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Ok.
- Super Frames Errors are CRC
- RS Corrected are FEC Errors i.e they don't affect throughput
Like I have posted in the past, Adjusting the SNR Target in the morning would be best as it would give you a faster speed, however this might effect the connection later in the evening.
What did you move the slider to in DMT, out of curiosity?
From your stats you posted in October the Sync speed looks improved, what sync were you experiencing on the old O2 router? Was it about the same or higher?
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Pretty much the same to be honest. I've been getting the full 8188 with a 3db noise margin with the o2 router. However, i used to have wierd upstream snr fluctuations whenever the phone was picked up but it looks to have steadied with the new router.
By the way, what does RCO mean on dmt? Under my sync for up and down it says RCO and shows me another sync speed.
I havn't tweaked it yet, still on 100%
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I would try tweaking it, see what you get :)
As for RCO, it basically is what your line could handle with the current conditions, or something along the lines of that. (if Kitz of one of the other gurus could clarify)
As for the % next to it, when I sync at 8128 it shows 100% so I imagine it is something to do with your sync speed relating to quality...
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Ok then, the RCO had 10626kbps for downstream so if i upgraded to 16meg package would i have synced at that speed?
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I doubt it because if i sync in the afternoon i barely get 8meg.
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So can anyone clarify what the RCO sync and percentage is? Thanks
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From the DMT pages @
http://www.kitz.co.uk/routers/DMTv8.htm
it tells you what the figures mean
RCO - Routers estimation of maximum achievable sync speed on adsl.
the percentage figure is simply that - actual sync as a % of the RCO.
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So you're saying i may sync near 10meg (estimation says so)? I doubt it because i can barely sync at the full 8meg unless i do it during peak time.
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Thats what your router estimates it will do - but bear in mind the figure is a snapshot at that particular moment in time during the sync + bit allocation stage (http://www.kitz.co.uk/adsl/adsl_technology.htm#sync). It cant possibly account for fluctuations in SNR.
According to the maximum speed calculator (http://www.kitz.co.uk/adsl/max_speed_calc.php), a 40dB line in good condition should sync at around 9000kbps with the default 6dB SNR. Then add on another 1200 kbps for 3dB of target SNR (appx 400 per dB) and you get circa 10Mbps - so the figures do seem to tie up.
So yes it will probably sync at that speed, but if you have large SNRM fluctuations, then obviously you will run into problems.
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How do i get the slide lower than 10%?
I saw the post from Jid with that adsl command but I dont get it fully.
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I can't even telnet into it as it says connection lost. I have enabled telnet via remote management.
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I found out how to get onto telnet. I had to close DMT tool before doing it but i cant log on. It wont let me log on via telnet, i can enter my login name but when it asks for a password it don't let me type anything.
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Never mind, i got it to work but by using both Jid's and Broadstairs' commands i cannot get the SNR lower than the 10% on the slider. I tries adsl configure --snr 1 but that gives me a 3.0db just like 10% on the slider.
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Never mind, i got it to work but by using both Jid's and Broadstairs' commands i cannot get the SNR lower than the 10% on the slider. I tries adsl configure --snr 1 but that gives me a 3.0db just like 10% on the slider.
The cmd I gave was:-
adslctl configure --snr 1
After clicking the send button you will need to refresh DMT to see the new stats.
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Ok i'll try it, what does snr 1 make the snr then? 100% is 6db for me so...
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Says not found.
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Ok, i used the adsl configure command posted by broadstairs and even if i make it snr 1 when i refresh dmt it still syncs with a SNR of 3db ( which is the lowest on the slider, 10%). So, is there any way i can go lower than that or not?
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Ok, i used the adsl configure command posted by broadstairs and even if i make it snr 1 when i refresh dmt it still syncs with a SNR of 3db ( which is the lowest on the slider, 10%). So, is there any way i can go lower than that or not?
If u try it early in the morning it may go lower...
You are trying it a little late in the evening perhaps?
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But if i asked o2 to lower my noise margin to 3db and then used say 50% on the slider it would be about 1.5ish. So?
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Basically, what i done is ask o2 to raise my target noise margin to 9db which makes my upstream SNR 9db. This way the router will not disconnect when i make or receive a phone call as the SNR wont drop a full 9db to trigger a resync. But with the SNR raised to 9db 10% on the slide is 3.0db. I just want to know if i can make it 1.5, 1.0 etc with any command. The one you gave doesn't work because even after i do adsl configure --snr 1 or say even 9 the target margin is 3.0db as set on the slider (10%).
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got a big problem! Whenever i use dmt tool or restart the router it always uses ADSL2, i even ticked the box in dmt tool and it still syncs with adsl2.
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Sorry if im annoying you, its just that im playing around with the new router :-[
I got the ADSL2+ working again. What im trying to do is find a way of getting the SNR lower than the 10%. When i set it to 10% and apply/resync it resyncs on a 3.7 noise margin but if i use the adsl configure --snr 1 command it syncs with 3.0 snr. Problem is i can't use a number lower than 1 so is 3.0 the lowest it will go?
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IT maybe that there is too much noise around at the time you are adjusting it with DMT.
I personally always used to adjust DMT in the mornings as it would give the higher sync speeds.
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Although you can use DMTtool to over-ride the target SNRM, my own observations are that in a lot of cases the maximum over-ride figure is 3dB - this may very likely depend on how the DSLAM is configured, but its not uncommon for you to be only able to tweak down 1 stage.
So therefore if your target SNR is set at say 6dB, then dont be too surprised if the maximum you can tweak it to is say around 3dB.
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Rahat... I think the answer to your question is no. Ask O2 to set the target SNR back down to 6dB or even 3dB then you will be able to get it lower.
If your SNR goes down when the phone rings, try changing your filters and/or checking your wiring. If it still happens you have a line fault and it needs investigating through your ISP.