In reply to a post by TheEulerID:

In that case, it will never sync faster than 40mbps (the exact number of kbps depends on some fairly arcane definitions of what the units actually mean; for strange reasons lost in the history of telecoms, 1 mbps is neither 1000 x 1000 bps or 1024 x 1024 bps, but a strange mix).

Despite the attempts of computer scientists to hijack them the units have, as far as telecomms go, always been in base 10 exclusively, and this has been codified by the ITU.

I suspect some confusion came from that an E1 is 2,048 kbps and it snowballed from there with ISPs selling services based on that as 2 Mbps as 2.048 Mbps or 2,048 kbps is a bit of a mouthful.

Either way if being accurate 1 Mb = 1,000 kb = 1,000,000 b, as confirmed by standards bodies all over the place

I get 57mbps on a line with 20.3 db attenuation, so a potential max of 49mbps at 24.3db attenuation is probably about right. It would be consistent with a line length of about 750 metres.

When/if vectoring comes along, then you might get another 10-15mbps.

In reply to a post by Ignitionnet:

In reply to a post by TheEulerID:

In that case, it will never sync faster than 40mbps (the exact number of kbps depends on some fairly arcane definitions of what the units actually mean; for strange reasons lost in the history of telecoms, 1 mbps is neither 1000 x 1000 bps or 1024 x 1024 bps, but a strange mix).

Despite the attempts of computer scientists to hijack them the units have, as far as telecomms go, always been in base 10 exclusively, and this has been codified by the ITU.

I suspect some confusion came from that an E1 is 2,048 kbps and it snowballed from there with ISPs selling services based on that as 2 Mbps as 2.048 Mbps or 2,048 kbps is a bit of a mouthful.

Either way if being accurate 1 Mb = 1,000 kb = 1,000,000 b, as confirmed by standards bodies all over the place

Absolutely correct but for those diehards who really can't get on without the old geek units there is a standard for them:

http://physics.nist.gov/cuu/Units/binary.html

But, frankly, these days there's not much point bothering with them. I'm a software developer and it's been a long time since I've had to round things to a power of two. It probably only matters to the few programmers still working close to the hardware in embedded systems. For most of us SI multiples are perfectly fine.

Of course one thing they all agree on is that 'm' means milli and 'M' means mega. 'b' means 'bit' and 'B' means 'byte'. Thus a 100mb/s connection is nothing to be proud of. A half way decent telegraph operator could do better than that. But 100MB/s is pretty damn stonking and something most of us can only dream about at home.

Edited by Andrue (Sun 04-Jan-15 20:47:42)

could someone help to take a look at mine? I only got 27M on bt infinity 1 52M package
thanks a lot


xdslcmd info --show
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Last initialization procedure status: 0
Max: Upstream rate = 21263 Kbps, Downstream rate = 50056 Kbps
Bearer: 0, Upstream rate = 7200 Kbps, Downstream rate = 27398 Kbps

Link Power State: L0
Mode: VDSL2 Annex B
VDSL2 Profile: Profile 17a
TPS-TC: PTM Mode(0x0)
Trellis: U:ON /D:ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 11.9 16.6
Attn(dB): 15.4 0.0
Pwr(dBm): 12.6 6.0
VDSL2 framing
Bearer 0
MSGc: 36 118
B: 31 222
M: 1 1
T: 64 17
R: 10 16
S: 0.0371 0.9836
L: 9056 1952
D: 877 1
I: 42 120
N: 42 240
Counters
Bearer 0
OHF: 280498 59997
OHFErr: 3463 1
RS: 107604821 4078543
RSCorr: 563356 3261
RSUnCorr: 786252 0

Bearer 0
HEC: 141196 0
OCD: 5640 0
LCD: 5640 0
Total Cells: 52511627 0
Data Cells: 1100660 0
Drop Cells: 0
Bit Errors: 0 0

ES: 17 1
SES: 14 0
UAS: 23 23
AS: 1004

Bearer 0
INP: 3.50 0.00
INPRein: 0.00 0.00
delay: 8 0
PER: 3.57 16.78
OR: 93.96 59.09
AgR: 27491.84 7259.11

Bitswap: 744/744 21/21

Welcome to the forums, though I do think you would have been better starting a new thread about your problem. Rather than reopening one that lived for a short time 16 months ago and has at best a tenuous connection to your problem.

Anyway - here goes.

Am I right in thinking you rebooted the modem, (an HG612?) about twenty minutes before taking the stats and posting them? Or were they taken some time ago. (People have been known to post stats months old, wasting a lot of time for several of us, so I need to check).

Assuming they are recent it looks very much as though "banding" has been applied to your line, with a top connection speed of 27.4Mbps. Have you had a history of problems on Infinity, or on ADSLx before it? If so, a little more detail (but not a book ) might help.

Was this Infinity connection good at first, and how long did that last please?

Hi Roberto,

Thank you very much for your reply.

I used to be on infinity 1 38M, and my HH5 was connected to the extension socket. There're several days with frequent disconnections when I first connected to BT back in 2015 Jan, I didn't pay much attention that time, the connection has been around 27M and quite stable later on.

I just got hold of a hg612 today, quickly unlocked it after diner and connected it to my master socket in bridge mode with an apple extreme as router temporarily. The stats I posted are today's data.

I am wondering if the possible "banding" was due to the extension socket I have been using all the time , and if there's any way to remove the "banding".

Thank you very much

Very common causes of this sort of thing are poor home wiring, or having things like phones and Sky boxes connected to the line without filters. There are other things of course, but we need to eliminate these first.

If you were just getting a low speed at first it can be fairly easy to check for that. It might be trickier if banding has been applied. That is put on to restrict the top speed you can connect at, because of lots of errors that were causing disconnections like you describe.

Once banding has been applied then even if the cause is found and fixed, it can be a fair while before the system removes it automatically. Also the first check we normally use wouldn't tell us anything .

What have you got connected to the line, including phones, Sky boxes as above, and burglar alarms? Do you also have a plug-in phone extension cable in use anywhere?

Also have a look at the first two and the last link on this page. Ignore the other ones. See if anything looks relevant.

Was this installed by an Openreach engineer, or a subcontractor like Kelly's or Quinn's? Or was it a self-install? How long ago was it? (Jan 2015!)

Edited by RobertoS (Fri 20-May-16 00:10:06)

It's an end of 2012 build flat, bt master and extension sockets already installed when I moved in.

I only connected the sky/bt modem to the extension socket with filter of course. No telephone or any other devices

At the moment only hg612 connected to the master.