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.

Similar Messages

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.

2009 Macbook issue: download speed limitation

Hi
Mi wife got a late 2009 white macbook that's driving me crazy. Despite we got a 7Mbit ADSL connection and all others macs at home (we got 2 more 2008 macbooks and a 2008 macbook pro) with the very same OS version (10.6.4) and network settings are working properly and downloading at full speed, her one looks to have some kind of speed limitation in download to around 1.5 Mbps.
The ping and upload speeds are the very same of other computers, and apparently randomly the download speed also on that computer gets back to around 7 Mbps...
I just spent the afternoon doing tests and I got nowhere but maybe I found a pattern...
First what I excluded:
-doesn't depend on how it's hooked to the net, same behavior by ethernet or wifi in both cases the other service was off
-any other mac using the same connection is working properly, did side by side tests
-ping is always the same on both computers used for test
-it is not a DNS issue
-deleted and created a new position in Network panel
-did several restarts, no solution
-doesn't depend on a specific app being used (but maybe apps can matter, see below)
-none of possible fixes I found online did work
-probably it isn't related to OS version or updates, this issue has likely been there since a lot of time, and over more os updates (not really sure of this, we had unrelated netwok issues and changed provider for that reason in last year, we cot a stable and uniform environment just recently)
Now what I noticed:
-As soon as the computer is started and I open a single browser (be it Safari, Chrome or Firefox doesn't change) speedtest.net test is ok, 7Mbps download.
-work and navigate with it, it's ok, download speed remains 7Mbps
-As soon another internet using application is opened (Mail, another browser) the connection speed drops to 1.5 Mbps (this is ALWAYS the limit, no relevant fluctuation in this)
-If I close any of above apps and remain with a single browser, running tests initially report still the 1.5 limit, but shortly after (one or two minutes) the speed gets back to 7Mbps
My wife needs to work with Mail, Skype, and at least two browsers open, so this limit is giving her great troubles

taylor.henderson wrote:
-none of possible fixes I found online did work
This doesn't really help narrow down the problem
{quote}
doh, you are right... sorry... the possible fixes I had found around are the ones reported right before...
Create a new user account on the problem computer and see if the slow speeds and strange behaviour persists in it.
I did, it does...
- created a new user and logged in
- opened Safari, speedtest returns 7Mbit/s in download
- opened Firefox, after a little speed drops to 1.4
- some successive test starts slow (1.4) then sometimes speeds up, but most remain at 1.4
- start chrome too, same behaviour
- close Safari and Firefox, wait a little (1 or 2 minutes) do the test with Chrome, back to 7Mbit/s
Then go through stuff like this http://www.gballard.net/macrant/osx_troubleshooting.html.
I went through it and did most of what's suggested there (it's a little complex because when I am not working my wife is usually using her macbook to study and needs to use it all the time)...
- unused disk space is 95,6 GB
- booted in single user mode and did a fsck -fy
- repaired permissions
Nothing changed, both the behavior takes place in new user account, and in main one, where any internet using application (Mail, Skype...) opened together causes the download slow down...

Drop in Sync Speed

Over the past few weeks I've seen a drop off in the Sync speed of my broadband and the Noise margin increase from 6dB to 8.5 dB.
I was connecting at 6Mbps but now it has dropped to 4.5Mbps - is there anything that I can do to get it back to what it was?
Everything has been fine with the connection itself - it has been rock solid in that it hasn't been disconnecting.
Line state:
Connected
Connection time:
0 days, 00:02:28
Downstream:
4.594 Mbps
Upstream:
448 Kbps
ADSL Settings
VPI/VCI:
0/38
Type:
PPPoA
Modulation:
G.992.1 Annex A
Latency type:
Interleaved
Noise margin (Down/Up):
8.5 dB / 22.0 dB
Line attenuation (Down/Up):
45.8 dB / 23.5 dB
Output power (Down/Up):
19.8 dBm / 12.6 dBm
FEC Events (Down/Up):
0 / 0
CRC Events (Down/Up):
0 / 0
Loss of Framing (Local/Remote):
0 / 0
Loss of Signal (Local/Remote):
0 / 0
Loss of Power (Local/Remote):
0 / 0
HEC Events (Down/Up):
0 / 0
Error Seconds (Local/Remote):
0 / 1

Looks like your target margin has moved from 6db to 9db, this is the values that equates to the initial noise margin needed for a stable sync.
You need to contact the mods on this site (click on one of their profiles for the link to them) and ask to have the targer margin reduced.
They may want to see a period of stable connection first but it is worth contacting them now since it takes them 3 days to reply normally.
A 9db target margin should give more line stability so unless you know what the problem was that caused it to increase (normally a series of resyncs, the default being 10 in 60 minutes) then you may want to check for a line problem first since otherwise if it is set to 6 it may go back to 9 again because of an underlying issue.
If my post was helpful then please click on the Ratings star on the left-hand side If the the reply answers your question fully then please select ’Mark as Accepted Solution’

Computer speed limitations for FoxPro 2.6

what are the computer speed limitations for FoxPro 2.6 MS but not Visual
I have done the patch to run on my with windowsXP
How many EZpatch versions are there?
Is the a way to run on a windows7 64bit computer.
I have graphics BUT
Body text cannot contain images or links until we are able to verify your account.
How do I do the verify?

FoxPro 2.6 either DOS or Windows as a 16 bit application cannot run on W7/64. You have to install some DOS emulator or Windows XP in Virtual PC environment.

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

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?

MSI CR52-A2 speed limitation

At DAO-RAW and DAO/96 this drive tops at 16x. Since at all other modes tops at 52x there is clearly a speed limitation. I've contacted MSI and they told they are trying to solve the problem. In the meantime I found out that Optorite makes burners for the MSI. they are identical. Some people have used optorites firmware and they work just fine. Has anyone here used a optorite's firmware?And if yes, at what speed can u write at DAO-RAW (clonecd)?
Thanks in advance

do u mind if I ask where did u get that info from?
Anyway, I don't know if they release a firmware that fixes that problem. I can only assume how stupid are people at MSI releasing a product which has this problem in the "most wanted" write mode all over the world. Unless they did that on purpose.
And of course I am not excluding myself from being stupid because I "didn't do my homework" before I buy this cd recorder.I should have known better.
And boy that msi support. I am in contact with them for over a month about this "DAO-RAW" problem and they keep doing stupid questions to me. These people over there really need some computer education. We are talking about THE most f*cking amateurs all over the world.

I think my sync speed is stuck or been capped

Hi everyone, last week i had a full line reset because i started dropping in speed, from 16meg al the way down to 9meg, at the time time of the reset my sync speed went to 12.5meg, 24 hours later i was down to 9.494meg down and 1.12 up, im supposed to be on another 10day training but nothing has happened, meaning the hhb3 hasnt switched off or resynced since i dropped to 9.4meg, now after 5 days of constant connection there was still no change so i did a something to try and make my speed drop but nothing happened, it still synced at the exact same speed 9.4meg, im certainly not rate adaptive and i cant have any line issues or my speed would of dropped after constantly plugging in and out the socket and making it resync, so the only things i can come up with is that ive either been capped or the exchange has got stuck for some reason, ive even gone through my entire extension wiring and changed it to cat6, it made my line attenuation lower but no change in sync rate heres my speed test and hub stats.
ADSL Line Status
Connection Information
Line state:
Connected
Connection time:
0 days,
04:02:35
Downstream:
9.494 Mbps
Upstream:
1.129
Mbps
ADSL Settings
VPI/VCI:
0/38
Type:
PPPoA
Modulation:
G.992.5 Annex
A
Latency type:
Fast
Noise margin
(Down/Up):
10.4 dB / 5.9
dB
Line attenuation
(Down/Up):
29.3 dB / 13.3
dB
Output power
(Down/Up):
18.1 dBm / 12.0
dBm
FEC Events
(Down/Up):
0 / 0
CRC Events
(Down/Up):
207 / 76
Loss of Framing
(Local/Remote):
0 / 0
Loss of Signal
(Local/Remote):
0 / 0
Loss of Power
(Local/Remote):
0 / 0
HEC Events
(Down/Up):
727 / 45
Error Seconds
(Local/Remote):
233 / 89
FAQ
<script type="text/javascript">// paintProgressAndMessageOnBar(100,"The test has successfully completed" ); // </script>
Test1 comprises of two tests
1. Best Effort Test: -provides background information.
Download Speed
8135 Kbps
0 Kbps
21000 Kbps
Max Achievable Speed
Download speedachieved
during the test was - 8135 Kbps
For your connection, the acceptable
range of speeds is 4000-21000
Kbps.
Additional Information:
Your DSL Connection Rate
:9721 Kbps(DOWN-STREAM), 1155 Kbps(UP-STREAM)
IP Profile for
your line is - 8576 Kbps
2. Upstream
Test: -provides background information.
Upload Speed
897 Kbps
0 Kbps
1155 Kbps
Max Achievable Speed
>Upload speed
achieved during the test was - 897 Kbps
Additional
Information:
Upstream Rate IP profile on your line is - 1155
Kbps
We were unable to identify any
performance problem with your service at this time.
It is possible that any
problem you are currently, or had previously experienced may have been caused by
traffic congestion on the Internet or by the server you were accessing
responding slowly.
If you continue to encounter a problem with a specific
server, please contact the administrator of that server in the first
instance.
Please visit FAQ
section if you are unable To understand the test results.
Solved!
Go to Solution.

Thanks for your replys, believe it or not my line as been more stable, meaning alot less disconnects,infact very rare since i last had the snr reset, it auto changed to fast when mods manually reset the snr a month ago, i think it sounds like a joint or something, def not my internal wiring, its all brand new as of today and theres no change in sync so, the prob lies else where, i tried to tell bt before that theres some kind of fault between the pole and the exchange last time my speed dropped when i was on adsl max, it dropped to 300k i think, i rang up for a mac code because they wouldnt acknoweldge the fact and gottalked into adsl2+, everything went well untill 3 weeksago(around that time) i was up to 16meg sync, i posted it on here, after opening my big mouth my speed started to drop so i had a manuall snr reset, that solved it for a while, then i had that bad weather and it all screwed up, like i said previous, about 10-20mins before the reset my sync dropped to 1meg and line attenuation shot up to 65db, after the reset i had 12.5meg, 24 hours later i was down to 9meg, person on the other end of the phone at bt said my minimum sync should be around 12meg

I want to set up 5 different ipods to sync from one library, but want to be able to control what is synced to each ipod and have it remember that for future synching and just look for new songs and not sync all the other music in the library

I want to set up 5 different ipods to sync from one library, but want to be able to control what is synced to each ipod and have it remember that for future synching and just look for new songs and not sync all the other music in the library

Click here for options.
(58961)

How to look at Sync Speeds

Previously on the home hub 2 and BT Total broadband you could look at your up and down sync speeds under the hub manager. Obviously now the connection comes through the openreach modem and then into the home hub. How can i access the modem page to view the sync speed ?
IT SUPPORT TECHNICIAN - Comptia A+ Certified, MTA Qualified and MTSC qualified
Solved!
Go to Solution.

You can't. It's Openreach kit and the firmware is locked.
The only way to get a rough idea of your sync is from your IP profile which can be found by running a test at www.speedtester.bt.com.
The IP profile is about 96.7% of your sync rate.
If you want to say thanks for a helpful answer,please click on the Ratings star on the left-hand side If the the reply answers your question then please mark as ’Mark as Accepted Solution’

Full backup ( ~ 1 TB ) using external HD - speed USB vs. Firewire vs. eSATA - what are relative speeds - how to install eSATA on mid-2010 Mac Pro desktop ( dual hex-core processors)_

    Hi All,
     I'm trying to resume regular scheduled Full backup ( ~ 1 TB ) of drives using external HD (to allow off-site redundant backup storage) .
     What are relative speeds of USB vs. Firewire vs. eSATA ?
     I suspect eSATA connection may be considerably faster … how to install eSATA on mid-2010 Mac Pro desktop ( dual hex-core processors)?
      ( The quicker and easier backup protocol is, the more likely one is to use it to backup on a routine repetitive basis.)
Thanks

Jim Bogy wrote:
...I suspect eSATA connection may be considerably faster … how to install eSATA on mid-2010 Mac Pro desktop ( dual hex-core processors)?
      ( The quicker and easier backup protocol is, the more likely one is to use it to backup on a routine repetitive basis.)
Adding a USB 3.0+eSATA PCIe card, which The hatter mentions, is the best solution that I've found. See http://eshop.macsales.com/item/CalDigit/FASTA6GU3/. The card is not cheap, but the USB 3.0 works flawlessly (which can't be assumed; ask me how I know) and the eSATA connection allows booting from the connected drive. Grant Bennet-Alder's point about HD speed is important to consider; in addition, the size of the individual files being backed up and where on the backup disk they're going will affect overall transfer speed. For example, using the USB 3.0 connection on that CalDigit card going to a Toshiba 3TB external, the transfer rate for a big file (say a virtual machine file) from an internal SSD boot drive was about 145 MB/sec while a bunch of little files might drop to 30 MB/sec and both rates decrease as an inner partition on the external is used. All told, a nearly 700 GB backup took under 1.5 hours. Using a HD as the source added almost an extra hour, though a WD external was used for that. Using a WD green drive plugged into this http://eshop.macsales.com/item/NewerTech/FWU3ES2HDK/ with an eSATA connection took about 2.5 hours also, but that was bootable whereas the USB 3.0 connection is not.
Another point to consider is that USB 3.0 is ubiquitous on PC's now so there's lots of price competition for externals; not so much for eSATA externals.

Sync speed / IP profile

Apoloogies if this is a daft question, or has already been asked before - but just noticed something interesting on my Infinity 2 connection via : sync speed is 75.9 but ip profile is 73.46. I thought ip profile controlled download speeds? Or am I talking about completely different things.
Many thanks.
Solved!
Go to Solution.

They both control speed in different ways.
The sync speed is the speed of the low level connection between the cabinet and the (white Openreach) modem. That is determined by the cab and the modem, based on the rules of Digital Line Management (DLM).
The ip profile is a limit imposed at the exchange (or somewhere near there) on the higher level (PPPoE) connection between the exchange and the (black HomeHub) router. The idea of the IP profile is to prevent your data being sent from the exchange to the cabinet faster than the cabinet can pass it on to you. The IP profile is automatically set from the sync speed whenever a high level connection is reestablished. It is set to a value just below the sync speed (around 96.8%), to allow for certain overheads. The actual download speed will be at best a little less still because of yet more overheads.
The sync speed is automatically adjusted when the low level connection breaks, or when DLM decides to give you slightly more or less speed (usually in the middle of the night to limit disruption). Often a break in the low level connection forces a break in the high level connection, and so the IP profile is automatically reset when the the low level sync is reestablished. Quite often the high level connection is not broken and continues despite the new sync speed. This results in a 'stale' IP profile. If the new sync speed is lower, you will only get the lower speed as that is all the line can (for the time being) manage. If the new sync speed is higher, you won't get the benefit as the IP profile will act as a throttle. For that reason we often suggest people disconnect and reconnect the ROUTER (NOT the modem) each morning if they suspect there might be changes; to force a profile reset. If you have an unlocked modem (as you must have) and can see the sync speed, then you can tell more exactly when a mismatch has happened and thus whether such a disconnect/reconnect is needed
You will see from your figures that the IP profile is correctly set for the sync speed.

Sudden Strange Decrease in Sync Speed

On the afternoon of Thursday 4/3/2010 I had a strange change in my sync speed.
For about the past year I have enjoyed a solid 3.1 meg sync and same IP Profile. Sometimes its goes up to 3.5, but never below 3 meg. I know my neighbours get around 2 meg, but working in IT I invested the time in getting decent kit and improving the connection, despite the line length being approx 4km.
However, on thursday afternoon I noticed the PPP link was down, but the sync was still at 3.1 meg.
So I rebooted the router (D-Link DSL-2740B)and it came back as 1.6 meg sync and 1 meg IP Profile! (Attenuation and SNR stayed the same at 63.5 and 6.5 respectively)
Obviously I did the usual checks and unplugged everything, with the modem directly in the master socket, changed the cables, changed the filters, tried a second modem, checked line for audible noise, etc and over 24 hours got the sync back up to 1.8 meg with a 1.5 meg IP Profile, but I cannot seem to get it any faster!
Now I know a direct neighbour (downstream) has had lots of problems with his line recently and keeping synced, but it seems odd that suddenly my connection quality has dropped by 50%.
Could someone have done something at the Exchange (Braintree) that could have affected me so badly?
Any help appreciated.
Adam

see if leaving everything alone improves the problem, its possible that someone was in the exchange and caused the problem, more likley is that someone was using a none compliantdevice in the area and caused the problem, have any of the locals recently received/used something like a shiney remote control vehicle or helicopter?
if the problem persists then request help via the forum mods, or ring india for it

HT1351 what is sync music (my iPod) in iTunes is it delete all song on my ipod or is it copy my song to iTunes ? and how can i copy my music from iPod to my iTunes

What is sync music (my iPod 4) in iTunes is it delete all my song on my iPod or is it copy my song´s from my iPod to my itunes?
And how can i copy my song´s from my iPod to my iTunes?

See Corrupt iPod classic.
tt2

What is sync speed limited by?

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