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Attainable Rate

mmcilroy
Grafter
Posts: 32
Registered: 29-11-2010

Attainable Rate

My router consistently reports an attainable rate of around 2800 Kbps yet my download rate is usually around 1.4 Mbps. I used to be able to download at 2.0 Mbps. I'm trying to figure out why my speeds have dropped. I'm guessing it's due to my IP profile - it's reported as 1.5Mb on both the BT and plus.net websites. Is it possible my profile has become stuck? If my line is stable should I not be getting speeds closer to my reported attainable rate?
30 REPLIES
Estragon
Rising Star
Posts: 811
Thanks: 10
Registered: 07-02-2012

Re: Attainable Rate

Can you see your connection speed in your router pages, not just the Attainable? That determines the IP Profile, not the other way round, and for one to be stuck at 1.5Mbps would be very unusual. Can you also see your Noise Margin, possibly called SNR or SNRM?
How long is it since you power-cycled your router? Preferably with a ten-minute interval between off and on?
Plusnet Help Team
Plusnet Help Team
Posts: 12,982
Thanks: 141
Fixes: 46
Registered: 27-04-2007

Re: Attainable Rate

Are you sure you've read that right?
Line tests show me that as "1810kbps"
If this post resolved your issue please click the 'This fixed my problem' button
 Adam Walker
 Plusnet Help Team
mmcilroy
Grafter
Posts: 32
Registered: 29-11-2010

Re: Attainable Rate

Here's my stats
SNR Margin (dB) 3.6 14.9
Attenuation (dB) 56.0 34.3
Attainable Rate (Kbps) 2736 708
Rate (Kbps) 1810 440
Router has been connected for nearly 2 days now (I changed the router 2 days ago)
What's the difference between rate and attainable rate?
Is there anything I can do to get my speeds back up to 2Mbps?
Estragon
Rising Star
Posts: 811
Thanks: 10
Registered: 07-02-2012

Re: Attainable Rate

OK, the 1.5Mbps IP Profile is correct for your 1,810kbps sync, as you appear to be on IPStream Connect. (Exchange not WBC/BT Wholesale ADSL2+ enabled).  Could you tell us your exchange please, to check that, as 1810kbps sync is strange unless the IPStream Connect system has changed.
The low SNR Margin suggests either you are tweaking it or there could be a lot of variable noise. Did you change the router because of earlier problems, and are you tweaking?
I'm trying to find out what has been going on in the recent past and what problems you've had, as I'm surprised you could only download at 2Mbps some time in the past. The 56dB attenuation suggests much higher than that should be possible. As though you have a long-standing poor connection that has got worse.
Community Veteran
Posts: 5,057
Thanks: 426
Fixes: 16
Registered: 10-06-2010

Re: Attainable Rate

The 440 upload, and 1810 not being an exact multiple of 32 suggests this is an ADSL2/2+ connection, so it must be WBC. But yes, the speed is a bit low for the attenuation.
mmcilroy
Grafter
Posts: 32
Registered: 29-11-2010

Re: Attainable Rate

I'm connected to this exchange
Exchange: Kells BT Code: NIKS
I've tweaked the SNR (lowered by 2) in an attempt to get a higher sync speed. It doesn't seem to make any difference though. The line is currently stable though I've never really had a problem with stability - it's just the download speeds aren't what I'd like.
mmcilroy
Grafter
Posts: 32
Registered: 29-11-2010

Re: Attainable Rate

Here are the full stats from my router (it's a Billion 7800DXL).
Connection Time 2 Day(s) 15:50:36
xDSL
Mode ADSL_2
Traffic Type ATM
Status Up
Link Power State L0
Downstream Upstream
Line Coding (Trellis) On On
SNR Margin (dB) 3.8 14.9
Attenuation (dB) 56.0 34.3
Output Power (dBm) 0.0 12.7
Attainable Rate (Kbps) 2764 712
Rate (Kbps) 1810 440
K (number of bytes in DMT frame) 0 0
R (number of check bytes in RS code word) 0 0
S (RS code word size in DMT frame) 0 0
D (interleaver depth) 64 8
Delay (msec) 7 8
INP (DMT symbol) 4.00 2.00
Super Frames 14199219 12598074
Super Frame Errors 538 87
RS Words 1959492317 1799861
RS Correctable Errors 18373538 1799
RS Uncorrectable Errors 11936 0
HEC Errors 2500 100
OCD Errors 84 0
LCD Errors 84 0
Total Cells 979740040 237802450
Data Cells 192523313 33219515
Bit Errors 0 7018
Total ES 278 53
Total SES 1 0
Total UAS 0 0
Community Veteran
Posts: 5,057
Thanks: 426
Fixes: 16
Registered: 10-06-2010

Re: Attainable Rate

You should probably start by checking out your telephone sockets and how they are connected. Do you have a modern master socket with a removable lower half? Are there any other telephone sockets, and where are they connected? The wiring for any extension sockets should be connected to the lower front part of the master socket, so that it gets disconnected when you remove that part to access the test socket.
mmcilroy
Grafter
Posts: 32
Registered: 29-11-2010

Re: Attainable Rate

I fitted a NTE5 ADSL faceplate recently
http://www.amazon.co.uk/gp/product/B003H6GUNA?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00
It didn't really make any difference. Prior to that I was connecting a splitter directly into the master socket
There is no extension wiring
Estragon
Rising Star
Posts: 811
Thanks: 10
Registered: 07-02-2012

Re: Attainable Rate

Quote from: ejs
The 440 upload, and 1810 not being an exact multiple of 32 suggests this is an ADSL2/2+ connection

Yes, that's why I said it was strange unless the IPStream product had changed. The stats in a later post are showing ADSL2, (not 2+?), and the exchange is WBC-enabled. I was confused by the 1.5Mbps IP Profile. I didn't check 88.2% of 1810, as my subconscious said it would be higher.  But - 1,596.42.
Estragon
Rising Star
Posts: 811
Thanks: 10
Registered: 07-02-2012

Re: Attainable Rate

Did you change the router to see if it improved the speed?
Does it always re-sync at 1810kbps?
You say you used to get over 2Mbps. As I said before, I would expect a lot more. Have you ever had it in the 3-4Mbps range, and when did it start to degrade from over 2 to the current under 1.5?
Does anything on this page look relevant? I assume the router is not sitting on top of or very close to some other electrical/electronic equipment.
mmcilroy
Grafter
Posts: 32
Registered: 29-11-2010

Re: Attainable Rate

Yeah I was hoping a new router would improve my speeds, but it hasnt really made any difference
I'll try resyncing again later to check what speed I get - but I'm pretty sure it's always syncing around 1800 kbps
The fastest I've ever seen was around 2.2 Mbps. I'm not sure exactly when the speed dropped (I haven't been using it a lot) but it's been like this for a good few months
The router is sitting right beside the NTE along with a phone and a homeplug adapter
Community Veteran
Posts: 5,057
Thanks: 426
Fixes: 16
Registered: 10-06-2010

Re: Attainable Rate

Can you try without the homeplug network adapters? Some brands of them have been known to generate a lot of interference which adversely affects the broadband signal.
Those ADSL stats did show interleaving was at a fairly high depth, and there were quite a lot of corrected errors, which suggests there is some sort of noise or interference affecting your broadband.
mmcilroy
Grafter
Posts: 32
Registered: 29-11-2010

Re: Attainable Rate

Here're my stats after a restart. I have disconnected everything apart from the router (no phone, no homeplug etc)
xDSL
Mode ADSL_2
Traffic Type ATM
Status Up
Link Power State L0
Downstream Upstream
Line Coding (Trellis) On On
SNR Margin (dB) 4.3 14.9
Attenuation (dB) 57.5 34.4
Output Power (dBm) 16.8 12.7
Attainable Rate (Kbps) 2176 708
Rate (Kbps) 1718 440
K (number of bytes in DMT frame) 0 0
R (number of check bytes in RS code word) 0 0
S (RS code word size in DMT frame) 0 0
D (interleaver depth) 64 8
Delay (msec) 8 8
INP (DMT symbol) 4.00 2.00
Super Frames 15996 14211
Super Frame Errors 0 0
RS Words 0 0
RS Correctable Errors 0 0
RS Uncorrectable Errors 0 0
HEC Errors 0 0
OCD Errors 0 0
LCD Errors 0 0
Total Cells 0 0
Data Cells 0 0
Bit Errors 0 0
Total ES 0 0
Total SES 0 0
Total UAS 142 142