View Theoretical and Real Connection Speeds

Hi,
I hate to start off like this, but: In Windows, when connected to a network-either wireless or wired-in the lower right hand task bar a theoretical connection speed is displayed. For example, 54 Mbps or 1000 mbps (gigabit), etc... However, I find Apple just shows you are connected, which I prefer, but is there some place I can check the theoretical speed. For instance, sometimes I want to ensure my gigabit connection is correct, or that I am using wireless-n or g, etc...
Also, anyway to get an actual readout of the speed? Perhaps based on distance, interference, etc... and it could roughly estimate what the connection is at...
Thank you,
TM

Sorry Thomas and doogald for not giving you the "solved" credit. Thank you both for answering part answer of my question but I wanted to mark the "solved" area containing both answers.
1) For actual internet and network stats: see Thomas's first post (with external link) and doogald's post.
2) For theoretical connection stat: Open Network Utility -> select the "Network Interface (enX)" drop down menu to select which connection you want to see stats on. Each drop down is either your wired, wireless, etc... Then under "Link Speed" your theoretical will be displayed.
Thank you all,
TM

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Hi, On 3 April my local exchange was upgraded to ADSL 2+. After the upgarde I was connecting at about 12000 kbps until yesterday morning. After the exchange was upgraded I signed up for another year. Friday morning I got an email stating that my 'Broadband service was ready' Since I have had this email I have been connecting at 8064 kbps which seems to me to be like my old connection speed. I know that today is the last day of training but I don't see how the line can train for a faster speed if it is only connecting at 8064 kbps. Can anybody enlighten me? Is this a coincidence or do I need to try and get it sorted by speaking to someone?
Solved!
Go to Solution.

Connected to the normal socket. Router stats are below. On Thursday the connection seemed to be OK and the Connection speed was at 15000 (ish) for downsream data and about 1127 for upstream. It just seems an awful coincidence that the speed reverted to the slower one after the contract change. Or is this change to a slower speed part of the normal trainng process? This is waht the speed test reveals but its wrong as the download speed is 6.9 Mbps
Download Speed
2.71 Mbps
0 Kbps
7.15 Mbps Max Achievable Speed
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Upload speed achieved during the test was - 363Kbps Additional Information: Upstream Rate IP profile on your line is - 448 Kbps
ADSL Link
Downstream
Upstream
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8064 kbps
448 kbps
Line Attenuation
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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.

I have an ipad 2 and when connected to my wifi at home it will not download and play you tube videos quickly. Do I need to upgrade my connenction speed? What is the optimal speed?

I have an ipad2. When connected to my wifi at home it will not download you tube videos for easy viewing. Do I need to upgrade my connection speed? Would 3 Mbps be enought or do I need to go to 6 Mbps. I mainly use my ipad to view emails, browse the internet and watch you tube videos.
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Welcome to Apple Support Communities.
There are a number of factors in the 'speed' equation. Any or all of them can affect the 'observed' speed of your connection.
1. Are you in a neighborhood full of WiFi routers (and thus, lots of WiFi interference)? I can 'see' at least 22 other WiFi routers from my living room!
2. What is the maximum connect speed and band and bandwidth available from your wireless router. Is it 802.11n or the older 802.11a/b/g? 300Mbits or 150Mbits? 2.4Ghz or 5Ghz or both? Does your router measure (QoS) Quality of Service and can it change 'channels' automatically?
3. What is the observed strength of your wireless connection? Are you getting at least 80% signal when connected? Are there other people in your family also using significant bandwidth at the same time (Netflix, streaming video, streaming audio, game systems)
4. What is the "advertised" speed of your current ISP connection?
5. What is the measured throughput of your current setup. Go to speedtest.net or use the free speedtest.net app available in the App Store. Try several times, from different locations in your home, and at different times of day and night.
I have AT&T DSL advertised at 3Mbit/sec down and 512Kbit/sec up. My Speedtest.net measured throughput is about 2.4 Mbit/sec downstream and upstream is about 0.4Mbit/sec. I'm using a Motorola Netopia 2210-2 DSL modem. I have no problem viewing YouTube videos and other mobile video content on the iPad 2. I'm connected wirelessly to a D-Link DIR-655 Gigabit router rated at 150Mbps at 2.4Ghz (only) with 802.11 b/g/n enabled. The interior of my home is within a range of 30-50 feet from the router and no more than 1 wall. It is a single level concrete slab foundation of about 1500 sq. ft. with cathedral ceilings. I have successfully streamed ESPN3.com on my MacBook at the same time my son was streaming another ESPN3.com game on his MacBook Pro. I've streamed YouTube videos while my son was watching a NetFlix movie on his Wii game system. He's also successfully used Skype for extended 'teleconferences.' None of my devices are connected to HDMI on a large screen TV. 95% of the time, I can do iChat video without any signal breakup to my son (who is at a college with a Gigabit (1000Mbit) wired connection!). 5% of the time the connection drops. We haven't tried FaceTime (designed for mobile connections to be much less bandwidth-intensive, from what I understand) simply because we both have iChat on our computers.
So for me, a 3Mbit DSL connection is absolutely adequate, given all the other parameters mentioned. As the car manufacturers say, "Your mileage may vary."
Message was edited by: kostby

Broadband Dropping Out and Connection Speed Decrea...

Sorry to be a pain but I am back here again.
Since the last issue with speed, connection drop out and noisey line which required an underground cable to be partly replaced, all has been fantastic and no problem to report. Many thanks to those who were involved in helping with getting that issue resolved.
About 10 days ago the broadband started to drop out at random times but not too often. The broadband hub light would go out for about 15 seconds before returning. My connection would automatically resume and no great problem. It has since become more of a problem and pain.
The frequency of drop out increased with a sort of pattern. Last week an example would be drop out at 11:50 am, again at 12:40 and once more at 1:30 pm. Each time the connection returned my computer icon for wifi would be a warning triangle. I clicked on the icon and would get a message 'limited connection'. The only way I could connect again would be to click the icon and select to disconnect and then connect, making sure a 'tick' was in the box for autoconnection. A bit more of a pain than before but usable. It got more of a problem over the next few days.
The frequency of drop out increased. This became a right pain when trying to purchase things online as I could not be sure in the purchase had been completed or if I tried again would I get two lots? Upon broadband connection returning I would not be able to 'auto connect' but would get the warning triangle of 'limited connection'. I tried the click to disconnect and reconnect but it failed to work. I ended up shutting down the laptop, waiting before powering up. This failed to work as all I would get is the warning triangle and 'limited connection'. The only way I could reconnect was to press the 'restart' button. This worked but it got worse.
The next day the broadband connection would drop out every couple of hours. It got to the point that even pressing the 'restart' button would not allow me to connect. I tried three times and gave up. I had to resort to pressing the very small 'reset' button on the back. This cured the problem for about 12 hours before the drop outs started again.
It is now a case of 50/50 if I can connect to the broadband again after a drop out. It is getting quite frustrating. I only used the small 'reset' as a last resort. I have noticed that the speed of the connection has started to drop down also.
Each time the hub drops broadband and I can auto connect and do not press any hub button, the timer has reset to zero days and zero hours. I know it takes about a week for the connection to settle. I do wonder if these drop outs are messing the connection settings for my line speed? The line used to be rated at 21 Mbps but has decreased to 17 Mbps, my actual connection used to be 19 Mbps but struggles to reach 14 Mbps. It is slowly dropping with each and every drop out.
I also looked at the event log in the hub. Just before each broadband drop out I see a external connection is made with the initials 'CWMP' followed by 'event code 1 boot' or 'event code 6 connection request' or 'event code 4 value change'. Straight after the broadband connection drops out with out fail.
All I can seem to find out is that the external connection is either the hub connecting to the server or vice versa? As for the codes? I have no idea at all.
I only ever resort to pressing 'restart' if I cannot connect to my hub. I have only pressed the 'reset' as a last resort as nothing else worked to allow me to reconnect.
Can anyone offer any help or best a permanent fix?

I connected to the test socket and used a wired connection for the speed test and hub stats.
The hub position and run of cables are the same as when the last engineer advised as the best set up.
Since my last post I have checked the event log and 'CWMP' has made at least two remote connections but the hub did not drop broadband connection. The broadband has been stable but just slower than usual, as you stated due to the drop outs/disconnections.
I guess a case of wait and monitor to see if the problem has resolved itself?
Will the speed automatically return to the usual 18 to 19 Mbps? or will something else have to be done to reset it at the exchange/server?
Here are the hub stats from this morning.
Connection Information
Line state:
Connectedppp0_0
Connection time:
2 days, 00:23:43
Downstream:
16.69 Mbps
Upstream:
1.024 Mbps
ADSL Settings
VPI/VCI:
0/38
Type:
PPPoA
Modulation:
G.992.5 Annex A
Latency type:
Interleaved
Noise margin (Down/Up):
9.5 dB / 7.1 dB
Line attenuation (Down/Up):
10.3 dB / 6.7 dB
Output power (Down/Up):
19.8 dBm / 12.4 dBm
FEC Events (Down/Up):
4947 / 0
CRC Events (Down/Up):
11 / 11
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):
377 / 48
Error Seconds (Local/Remote):
72 / 21

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When the You View box is recording two other programmes, to watch something via the internet on the smart tv, we would previously have used a wireless signal to the tv, but it does not seem to work.
The laptop works fine wirelessly in the same room, so the router must be producing a wireless signal, but the TV is seemingly unable to find the network (wirelessly or wired) while the ethernet cable is plugged into the You View box.
Does this mean the only option to watch internet only programmes on the tv is to disconnect the ethernet cable from the You View box and connect it to the tv? Or if we disconnect the ethernet cable from the router, would the tv then pick up the wireless signal? It would be better to not have to disconnect anything....
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Kate
Solved!
Go to Solution.

SOLVED - we had to do a factory reset on the tv, to get it to link to the new BT home hub.... it was linked to our previous router from the previous ISP.,.

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For the past 3 weeks, I have had ADSL noise on the line and when the phone was picked up the ADSL connection would drop.
An engineer attended and "fixed" the fault.
After a few days following the supposed fix, the ADSL speeds subbenly drop from 11 Mb to 3 Mb, and when you check the phone, it is completely dead. I then switch off the ADSL modem, and after 10 minutes re-start, the ADSL connection comes back on at the higher speed of 11 Mb and the phone is alive again.
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That is an excellent suggestion. I will try it out when I can get access to the computer again. It would show whether it is a computer problem or a Firefox problem. One thing I have noticed between the XP computer and the Vista computer is that the Vista computer jumps way high in throughput to 100 Mbps then drops way low then way up again. The average is 35 Mpps when using Chrome or Internet Explorer, but it is very uneven. The XP computer goes up to 48 Mbps and stays steady. It seems like there is something in Firefox where it can't keep up so it drops way off. The Vista computer is a 6 gig RAM quad core, so you would think it would always be faster.

Slow internet speeds and dropping connection

hello, I am making this post on behalf of my dad, for a good few months (5-6 maybe even longer) we have been experiencing slow internet speeds and a dropping connection when ever the phone is picked up. when an incoming call is answered some or all devices connected to the internet drop out for a second then come back online, the connection does not completly disapear but causes any voice chat, streaming or gaming to disconect. We have BT wireless phones (not sure what exact type) which we have had for a few years. they are connected through an ADSL filter which as far i can remember has been there for years. We have a netgear DG834GT router which has also been there for a few years. I went onto its settings and got this information, not sure if its usefull or not.
System Up Time 42:18:47
ADSL Link
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Upstream
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448 kbps
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Noise Margin
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13.0 db
I also got this from the BTW speed tester
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0 Mbps
2 Mbps
Max Achievable Speed
Download speedachieved during the test was - 1.24 Mbps
For your connection, the acceptable range of speeds is 0.4 Mbps-2 Mbps.
Additional Information:
Your DSL Connection Rate :1.76 Mbps(DOWN-STREAM), 0.45 Mbps(UP-STREAM)
IP Profile for your line is - 1.25 Mbps
I hope this is enough information to figure out what is going on with it.

put everything back as it was and this is what it looks like now:
ADSL Link
Downstream
Upstream
Connection Speed
160 kbps
448 kbps
Line Attenuation
61.5 db
31.5 db
Noise Margin
19.9 db
12.0 db
also while i was doing that i did i quiet line test and both myself and my brother listened to it and agreed that there was buzzing/static

View Theoretical and Real Connection Speeds

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