Slow Sync Speed

Hi there,
I've read many posts on this forum and believe that my sync speed is quite low. I did a theoretical max speed test for my line attenuation at Kitz.co.uk and it said that I should have a speed in excess of 19000kbps with an ip profile of 16000kbps. I have been using a dodgy micro filter that disconnected the broadband everytime I recieved a phone call however I have purchased a new one and my router is running flawlessly with no dropouts. The noise margin is constantly at 6db. I believe that this may have flagged my line to be faulty and thus resolved a slower sync speed to compensate.
I disconnected the broadband roughly 8 days ago after it had been connected for about 15 days expecting to sync at a higher speed but infact the sync speed dropped by several hundres kbps.
Is there any way that I can sync at a higher speed?
Thanks in advance

Ok I ran cat /proc/avalanche/avsar_modem_stats via telnet
AR7 DSL Modem Statistics:
[DSL Modem Stats]
US Connection Rate: 828 DS Connection Rate: 10544
DS Line Attenuation: 23 DS Margin: 5
US Line Attenuation: 13 US Margin: 9
US Payload : 3985202784 DS Payload: 3901859552
US Superframe Cnt : 42408111 DS Superframe Cnt: 42408111
US Transmit Power : 0 DS Transmit Power: 0
LOS errors: 0 SEF errors: 0
Errored Seconds: 3592 Severely Err Secs: 4
Frame mode: 0 Max Frame mode: 0
Trained Path: 1 US Peak Cell Rate: 1952
Trained Mode: 16 Selected Mode: 1
ATUC Vendor Code: 54535443 ATUC Revision: 3
Hybrid Selected: 1 Trellis: 1
Showtime Count: 1 DS Max Attainable Bit Rate: 11328 kbps
BitSwap: 1 US Max Attainable Bit Rate: 1284966 bps
Annex: AnxA psd_mask_qualifier: 0x0000
Power Management Status: L0 DS HLINSC: 0
US ACTPSD: -345 DS ACTPSD: -366
Total init. errors: 0 Total init. timeouts: 0
Showtime init. errors: 0 Showtime init. timeouts: 0
Last showtime init. errors: 0 Last showtime init. timeouts: 0
ATUC ghsVid: b5 00 54 53 54 43 05 10
T1413Vid: 00 00 T1413Rev: 00 VendorRev: 00
ATUR ghsVid: b5 00 54 53 54 43 00 00
T1413Vid: 00 00 T1413Rev: 00 VendorRev: 00
[Upstream (TX) Interleave path]
CRC: 351 FEC: 275203 NCD: 0
LCD: 0 HEC: 220
[Downstream (RX) Interleave path]
CRC: 5290 FEC: 67573629 NCD: 0
LCD: 0 HEC: 0
[Upstream (TX) Fast path]
CRC: 0 FEC: 0 NCD: 0
LCD: 0 HEC: 0
[Downstream (RX) Fast path]
CRC: 0 FEC: 0 NCD: 0
LCD: 0 HEC: 0
[ATM Stats]
[Upstream/TX]
Good Cell Cnt: 83025058
Idle Cell Cnt: 1324844211
Tx Packets Dropped Count: 0
Tx Bad Packets Count: 27
[Downstream/RX)]
Good Cell Cnt: 1244509050
Idle Cell Cnt: 3798720619
Bad Hec Cell Cnt: 84325
Overflow Dropped Cell Cnt: 0
Rx Packets Dropped Count: 0
Rx Bad Packets Count: 0
[SAR AAL5 Stats]
Tx PDU's: 27918363
Rx PDU's: 43978168
Tx Total Bytes: 2729375221
Rx Total Bytes: 2652108237
Tx Total Error Counts: 0
Rx Total Error Counts: 1569
[OAM Stats]
Near End F5 Loop Back Count: 0
Near End F4 Loop Back Count: 0
Far End F5 Loop Back Count: 0
Far End F4 Loop Back Count: 0
SAR OAM Ping Response Drop Count=0
I'm guessing that I am on ADSL as it says annex A? Does that mean that I can access any higher speeds as I'm not on ADSL2/+? or would forcing the modulation on the router help?
Update: It is set to trained mode 16 which is ADSL2+ What is going on here, I just restarted the router and it is now slower.
Thanks

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Downloads slower than sync speed

I got connected a few weeks ago an happy with the sync speeds. 73 Down 19.9 Up The problem is no matter what I download I can't go over 55Mbit I have done a few speedtests and can't get over 55Mbit. Is there something wrong with my router or the line? I'm have a DSL N68U.
Here are my stats

TimCurtis wrote:
The problem seems to be with your profile - from the BT speed test.
DLM has set your sync speeds , although perhaps a little lower than might be expected, at 73k. From that you'd expect the profile to be at about the same figure, but yours is a lot lower which is the problem I'd guess.
Exactly what I was thinking. I was under the impression that with the current set up and under normal conditions ADSL2+ should set the downstream IP Profile to 88.2% of downstream sync and VDSL2 should set it to 96.8% of downstream sync.
Take my example. My line is capable of VDSL2 speeds of over 80Mbps. I'm on Infinity 1 so my downstream sync is capped at 40Mbps and my modem does sync at that. My downstream IP Profile is 38.72Mbps (exactly 96.8% of sync).
Kas,
Your stats show that your line is capable of 102.66Mbps. You are on Infinty 2 so your downstream sync has been capped at 80Mbps and in fact is currently synced at 73.46Mbps (possibly due to some slight noise on the line?).
However your downstream IP Profile is 57.71Mbps which is only 78.6% of sync. When downloading data via the internet using IP you will not get a speed greater than this limit. That explains your test results.
So the question that someone more knowledgeable might be able to answer is why the IP profile is set so low compared to sync speed?

Questions and answers on DLM, sync speed and real ...

I was confused about some DML details and posted on a BE forum (https://avatar.bethere.co.uk/forum/viewtopic.php?t=43542) and got what was to me an incredibly helpful response from Tom (drsox). I thought it would be of interest to some readers here so copy it below. Once again, many thanks Tom.
1) FTTC DLM applies only between the cabinet and the modem?
>> Yes, as there isn't any broadband / data signal going anywhere further down the line to the exchange if you are on FTTC!
2) What are the different parameters that apply on this hop? I know there is a current sync speed, a current snr, a target snr and an ip profile. Anything else?
>> The IP profile isn't really related to DLM, it just "follows" your sync rate. In the past the IP profile would take up to 3 days to "follow upwards", leaving you with a high sync and awful speeds! This has been changed now on 21cn and "RE-ppp"ing (rebooting the router) would force the IP Profile to update instantly.
DLM changes the SNR target. So where BE have hard coded / set SNR targets such as 3db, 6db, 9db, 12db etc.. They only change upon user request. BT use their DLM system where line instability or line error counts are collected and analysed, the SNR target and interleaving settings are then modified in increments to try and stabilise the line.
This image shows quite well how, over a 6 day period, BTs DLM noticed that my line fault was fixed. I didn't get the full speed back for a week.
3) Is the ip profile the same as the BRAS profile?
>>Yes
4) The DLM keeps statistics of errors etc to dynamically change the ip profile?
>> Changes the SNR target and interleaving for the line which will reduce the speed, and therefor the IP profile.
5) There is a general theory that the DLM is incapable of telling the difference between an error and a modem power cycle, so that power cycling can cause your profile to lower. Is that correct?
>> Yes, if you resync / power cycle your router multiple times in a day it is likely to try and "combat the line errors" and reduce your sync rate by increasing the SNR and / or interleaving on the line.
6) Can other connections and disconnections have the same effect? For example, if I reboot the router (where this is separate from the modem)? Or use the router interface to disconnect/reconnect the broadband?
>> PPP drops (router reboots while leaving the BT Openreach VDSL modem on and connected) won't affect DLM. The IP profile will match your sync rate upon reconnection of the PPP session.
7) If you have a low ip profile, does this mean that the sync is limited to the ip profile?
>> Other way around, if you have a low sync rate then the IP profile will match the sync rate. If you get an awful sync rate and the IP profile follows downwards, then you resync higher but the router "keeps the PPP session open" (which is possible if you resync quick enough) then your IP profile will stay low, even though the sync is high. Until you reboot your router or disconnect and reconnect the PPP session.
8) Can the sync rate change dynamically without a reconnection? If the ip profile gradually rises, will the cabinet force a resync to make sure the customer is actually getting the benefit of the higher ip profile, or must the user intervene with a modem resync?
>> See above - Sync can rise without affecting the IP Profile and the cabinet does not force a RE-PPP.
8) As I understand it, if the ip profile gets stupidly low for some reason, it can only be reset by BT wholesale? This will only be done after a visit to your home and a telephone call from the engineer to the BT wholesale central admin?
>> Mixed reports plus I don't think people understand the difference between sync speeds, line faults, the delay in DLM increasing sync after a fault.. I expect half the reports on the BT forum are not related to a stuck BRAS / IP profile. It is possible for the ISP or a BT engineer to reset the IP profile and possibly DLM training.
9) (8) This applies to all ISPs using BT Wholesale: some may be more willing to force this process to happen on behalf of their customers, but none can cirumvent it?
>> GEA providers (I believe) still have DLM but don't have BRAS / IP profiles unless they implement their own.
10) Who sets the snr? As I understand it, the customer has no direct control. Is this different for different ISPs?
>> Mixed information again, I believe that BT Wholesale give providers DLM override controls and SNR settings but none? (or few) ISPs use this system.
11) Real download/upload speeds are physically limited by the sync rate. They are also naturally limited by local limitations (such as wireless connections), server limitations, and congestion at various points along the route? Any more? The congestion along the route will vary bewteen ISPs as they use different routes with different capabilitues.
>> It is possible for BTs regional or local cabinet network to become congested. Supposedly the minimum speed you should achieve over the BT part of the network is 15mbps. ISPs such as Plusnet, BT etc.. then layer their own "discriminatory" traffic management on top of that (ie, slow down torrents etc.).
12) Real speeds are 'unnaturally' limited by throttling. This will also vary from ISP to ISP. Sky claims to have none, and BT none except for p2p. PlusNet and John Lewis have significant (but well explained)throttling. All the more expensive operators have none.
>> What you said
13) The ip profile affects the sync rate, and therefore actual speeds. Does the ip profile effect actual speeds in any other way?
>> Not quite right. The IP profile directly affects the speeds you can achieve but the sync rate affects the IP profile. The sync rate is determined by the stability and quality of your line and what DLM thinks it can cope with.
14) Many people (including AndrueC above) report real speeds from speedtests that are consistent and not close to the ip profile. These can't be explained by congestion (that would make them inconsistent). They can't be explained by server limitations, as they are consistent accross servers and the same servers give better speeds to other people. They can't be explained by local limitations, too many people claim sudden drops where the local conditions have not changed. They should not be able to be explained by throttling, as they as seen for many ISPs who do not throttle (I don't hold with the ISP lying theory here). What other factors are there that can explain these cases?
>> AndrueC and some other Sky customers have strange symptoms where speeds are around 20mbps rather than the full sync speed. The only logical explanation is either local cabinet congestion, contention between BT and the provider's network (not enough investment by the provider) or artificial traffic management on the providers side. It is also possible that the router that the customer has attached to their line is unsuitable for the higher speeds. For example an old ethernet router may only be able to cope with 20 or 30mbps! A friend of mine has a TP-Link ethernet router running Tomato on a BT 80mbps service but the TP-Link's CPU limitation causes his service to only perform at around 68mbps; he has a replacement router on order. (Obviously wifi will significantly reduce performance).
15) If you get a stupidly low ip profile, how long can you except it to take before it climbs to something more reasonable? (eg in my particular case, my profile is currently around 15Mb, and from BT service line tests should be around 58Mb). And the classic question, is it best to power cycle the modem (1) never, (2) occasionally (how often) or (3) never if at all possible? Mine did jump from 3.5Mb to 15Mb on one power cycle. Was that just coincidence?
>> My FTTC line took about 6 to 7 days to go from 40mbps to 80mbps after a line fault. It is possible that your 3.5mbps to 15mbps increase was the "re-ppp" affecting the BRAS profile and that your sync had slowly been increasing over time.

what a waste of money sending an engineer to "fix a fault" which does not exist. Precisely.
In my original BE post to which Tom so helpfully responded, I began: It seems to me that DLM is an excellent concept with a highly flawed implementation, both technically and administratively. I think that sending out an engineer to fix an obviously flawed profile is the main example of an adminastrative flaw. I understand (I can't remember source, maybe Tom again) that they are sometimes relaxing the requirement for a visit before reset.
Maybe the DLM system is too keen on stability vs speed. This will keep complaints down from many people: most users won't notice speed too much as long as it is reasonable, but will be upset if their Skype calls and browsing are being interrupted too often.
However, it does lead to complaints from people who notice the drops after an incidence (as in your thread that has drawn lots of interest), or who only get 50 instead of 60. The main technical flaw is that DLM can so easily be confused by drops from loss of power, too much modem recycling, etc, and then takes so long to recover.

Very slow broadband speeds

Hello
My first post, and I'm hoping that someone will be able to help me with this.
For a few days now, I've been experiencing very slow broadband speeds (100kbps or less), in contrast to the 1.5 - 2Mbps that I would usually expect to get. I've been on hold to BT technical support for some time, and have got through twice, on both occasions being told that this is a widespread issue and to wait until the next day. However, I'm not seeing any improvement. I'm aware of the problems in Edinburgh and the North of England,but I'm in East Anglia.
speedtester.bt.com shows:
Your configured download throughput speed for this service is 135 k
and then:
Two consecutive attempts have failed to initialise an Assured Rate session for your service.Please raise a fault with your service provider stating that the Performance Tester tool indicated a problem with initialising your Assured Rate session. <script type="text/javascript">// paintProgressAndMessageTestBar(-1,""); paintProgressAndMessageOnBar(-1,'An Error has Occured! '); // </script>
My hub stats are:
ADSL line status
Connection information
Line state Connected
Connection time 1 day, 13:59:54
Downstream 1,504 Kbps
Upstream 448 Kbps
ADSL settings
VPI/VCI 0/38
Type PPPoA
Modulation ITU-T G.992.1
Latency type Interleaved
Noise margin (Down/Up) 15.0 dB / 19.0 dB
Line attenuation (Down/Up) 60.0 dB / 31.5 dB
Output power (Down/Up) 16.6 dBm / 11.9 dBm
Loss of Framing (Local) 0
Loss of Signal (Local) 0
Loss of Power (Local) 0
FEC Errors (Down/Up) 4586 / 92
CRC Errors (Down/Up) 297 / 2147480000
HEC Errors (Down/Up) nil / 72
Error Seconds (Local) 221
I hope this is enough information, but I'll happily supply anything else if I can. The uptime of 1.5 days is the time since I was advised to restart / reset to defaults etc.
Thanks for any help.
Deej.

Once a line is stable and working well, it's best left running 24/7
Interventions like resets, replacing accelerators, unplugging the router etc. will cause line "flapping"
And the dslam sees this as instability, and in turn the BRAS lowers the IP profile ....
This is done to achieve stability, and decrease throughput purposefully, all done automatically.
What you have to do, is cure any line noise, plug directly into the master or test socket behind the NTE
faceplate, leave it connected and wait for the throughput to increase.
Very often a rock bottom IP may need a kick to get it out of the doldrums.
Eventually the noise margin will decrease, sync will increase, and IP profile go up.
Depending on how long the line has suffered impulse noise, will determine the time for SNR to come down.
Regardless of which type of phone you used to test quietline ... hum or crackle is a no-no.
It may be the cause of the problems. It could be REIN on the network portion of the connection or dslam
crosstalk, either way it needs to be reported as line noise before you can count it out of the equation.

Continual Drop in Sync Speed

I have been experiencing a continual drop on sync speed and thus actual line speed over the last few weeks. I had a HH4 replaced aftger teh last one died and since then the line speed seems to be getting slower and slower.
I am on DSLMax (good old ADSL) and normally sync around 8mb as am very close to the actual exchange - am now down to 6.4mb and am sure it will drop again.
Normal instructions from the phone support has been applied - reset hub etc.... and has not made a difference...
Can I ask one of the mod's to try and help out - see why the line is syncing lower than it normally does/has been for the last 3 years....
thanks
Pete

in order for the forum members to help please can you post the adsl stats from your router you may need to 'show detail' to get all stats (if hub enter 192.168.1.254 in your browser and navigate to adsl or if HH4/5 then go to troubleshooting then logs and you are looking for 2 line together when hub last connected to internet and they will show your connection speed and noise margin or if netgear enter 192.168.0.1). Then run btspeedtester (MAC users may have problems). when first test completes then run diagnostic test and post the results ( do not reset the router).
are you connected directly via a filter to the NTE5 master or test socket or to somewhere else? Is the master the only phone socket in your home?
Have you tried the quiet line test? - dial 17070 option 2 - should hear nothing - best done with a corded phone. if cordless phone you may hear a 'dull hum' which is normal
Someone may then be able to offer help/assistance/suggestions to your problem
If you like a post, or want to say thanks for a helpful answer, please click on the Ratings star on the left-hand side of the post.
If someone answers your question correctly please let other members know by clicking on ’Mark as Accepted Solution’.

What is sync speed limited by?

Assuming my line is all ok, what is sync speed limited by?
The reason i ask is im told my exchange and line is rated for 2 meg (which i was syncing at around 2.5), on sppedtest was getting 2 meg download...so all is looking well...but then randomly one saturday (about 2 weeks ago) i changed over a filter and disconnected the extension wiring, reset the home hub and synced at 3.9 meg, with a nice SNR of 5.9db. Obviously i was well impressed as my speed went up!
Why was this sync different? As im yet to get anywhere near that again?

neild7744 wrote:
Assuming my line is all ok, what is sync speed limited by?
It's essentially governed by the characteristics of the line. Even if the line is OK, it'll still have properties that could limit the possible speed to an extent. eg lines all attenuate the signal, even good lines.
There are other factors, "hard" caps for example can be imposed by the hardware, possibly due to the service you're buying. An "up to 8Mbps" service will never go faster than that, even if the line is capable.
The reason i ask is im told my exchange and line is rated for 2 meg (which i was syncing at around 2.5), on sppedtest was getting 2 meg download...so all is looking well...
Not really relevant to your question, but...while your line may well be "rated for 2 meg" the exchange will be capable of more than that. If you get anything less, it's due to one of the reasons above.
but then randomly one saturday (about 2 weeks ago) i changed over a filter and disconnected the extension wiring, reset the home hub and synced at 3.9 meg, with a nice SNR of 5.9db. Obviously i was well impressed as my speed went up!
Why was this sync different? As im yet to get anywhere near that again?
On the face of it, it sounds as though either the filter or the extension wiring is causing some noise/interference on the line, which was slowing things down.
If this behaviour is consistent and repeatable, it should be fairly easy to find and eliminate the cause, which may give a very worthwhile improvement to your speed.

Loss of sync speed (over 50%), openreach say line ...

Hi,
I hope someone can help!
For the last 24 months my sync speed has been a consistent and stable 7000+ so my BRAS profile was 6500.
Last weekend the connection dropped and now will not sync any faster than ~3000, so half the usual speed, well actually less because my BRAS is now 2500
I have checked all ADSL filters, connected the ADSL router directly to the master socket removing face place to disconnect the extension wiring, tried a different and known working router - another home hub and a Cisco, etc etc smae results.
The SNR on the line is unchanged at 35dB as previously be good for 7000+, so I can't understand why my sync is now 3000
At a sync of 3000 the SNR is 6dB (previously 7000 sync @ 6dB) which would suggest the line
is noiser than before, although no additional noise is heard on the voice line.
Openreach have been to visit - the line passed all of their tests. The openreach engineer also could not sync faster than ~3000.
He went to the exchange and redid the wiring to the DLSAM - no speed improvement.
He called me from the exchange and said that the DLSAM is "sending to me @ 7.2" - so I thought great, he's sorted it, then he told me no it would not be any better as "the line loses 1 meg for each km" .... so we entered a bit of dialogue about how the line could not be synced @7.x at the exchange end and 3.x at my end, about line sync, DMT tones etc etc I think I was going over his head! He then went on about maybe it's slower because there are now more users on the exchange - again I explained about how the contention actually works on the VC to the BT core, not by BT Wholesale decreasing sync speed on the DSLAM sync... again going over his head....
So basically he thinks it's fine as the line tested ok and I doubt I'll get any further change.
Now here is the strange thing -
...it was only after the call that I realised that he'd have no visibility of the sync speed on the DSLAM so when he said it's "sending to me at 7.2" he meant that he was plugged directly into the DSLAM port with his portable tester... Now he should be syncing @ 8Meg when connected directly to the DSLAM in the exchange, so it must be a fault on the DSLAM port / profile?
How do I go about getting BT wholesale to move me to a different port? Not only has my speed decreased but I get random re-syncs.
Please help!!! :-)
Cheers
Matt
PS provider is BT Total Broadband

Here's the other strange thing - I just reset the line to clear the stats, and made sure no other PCs were connected, i.e no significant volume of data being send/received, and in 5 minutes I have 160,000 FEC/Interleave errors - that's not right surely?
ADSL line status
Connection information
Line state
Connected
Connection time
0 days, 0:05:17
Downstream
3,392 Kbps
Upstream
448 Kbps
ADSL settings
VPI/VCI
0/38
Type
PPPoA
Modulation
ITU-T G.992.1
Latency type
Interleaved
Noise margin (Down/Up)
5.9 dB / 22.0 dB
Line attenuation (Down/Up)
36.0 dB / 21.0 dB
Output power (Down/Up)
19.5 dBm / 11.8 dBm
Loss of Framing (Local)
64
Loss of Signal (Local)
11
Loss of Power (Local)
0
FEC Errors (Down/Up)
165234 / 2
CRC Errors (Down/Up)
217 / 2147480000
HEC Errors (Down/Up)
nil / 0
Error Seconds (Local)
685

Slow connection speed

Hi
I am on Infinity 2 and my HH5 is reporting me as receiving 40.3 Mbps down, this is not what I paid for especially after leaving my 100mb virgin line.
When the line was first installed the speed was much higher, I had to have my HH5 replaced due to orange light issues, and speed seems to have been slow since.
Any help would be appreciated
This is what helpdesk says
1. Product name:
BT Home Hub
2. Serial number:
+068343+NQ34735885
3. Firmware version:
Software version 4.7.5.1.83.8.204 (Type A) Last updated 20/01/15
4. Board version:
BT Hub 5A
5. DSL uptime:
2 days, 08:18:08
6. Data rate:
20000 / 41269
7. Maximum data rate:
25263 / 82584
8. Noise margin:
6.6 / 11.8
9. Line attenuation:
17.8 / 17.6
10. Signal attenuation:
17.7 / 17.7
11. Data sent/received:
1.0 GB / 13.6 GB
12. Broadband username:
[email protected]
13. BT Wi-fi:
Yes
14. 2.4 GHz Wireless network/SSID:
BTHub5-CKHP
15. 2.4 GHz Wireless connections:
Enabled (802.11 b/g/n (up to 300 Mb/s))
16. 2.4 GHz Wireless security:
WPA2
17. 2.4 GHz Wireless channel:
Automatic (Smart Wireless)
18. 5 GHz Wireless network/SSID:
BTHub5-CKHP
19. 5 GHz Wireless connections:
Enabled (802.11 a/n/ac (up to 1300 Mb/s))
20. 5 GHz Wireless security:
WPA2
21. 5 GHz Wireless channel:
Automatic (Smart Wireless)
22. Firewall:
Default
23. MAC Address:
18:62:2c:64:a5:ac
24. Modulation:
G.993.2 Annex B
25. Software variant:
AA
26. Boot loader:
1.0.0
and what dsl checker says
Featured ProductsDownstream Line Rate(Mbps)Upstream Line Rate(Mbps)Downstream Range(Mbps)Availability Date High Low High Low
FTTC Range A (Clean)
77.6
57.9
20
18.9
Available
FTTC Range B (Impacted)
70
41.3
20
12.2
Available

Your noise margin is way above the target of 6 which indicates DLM is active on your line and has reduced your sync speed. If your connection is now stable then DLM will increase your speed gradually over the next few days
If you found this post helpful, please click on the star on the left
If not, I'll try again

ITouch Sync Speed to Vista Laptop

If I just connect my Itouch to my laptop and add new tunes via Itunes then the sync speed is very slow. However, if I also connect my old Ipod 30Gb video at the same time to any other USB port the Itouch sync speed increases dramatically! Much faster - almost as quick as the old Ipod. Is this an Itunes issue? It's a bit weird as the old Ipod syncs correctly on it's own. The Itouch has the latest - 3.0 - firmware.
Regards Graham

This ABSOLUTELY solved my problem... everyone having hang up problems check this out! It worked perfect. Thanks for the help man... Hope itunes have this fixed soon.

Slow Sync Speed

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