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Why can't I get 8mb speed when my neighbours do?


Why can't I get 8mb speed when my neighbours do?


I've been on MAX DSL for a few months, but have never gotten anywhere near the 8mb speed - my router normally connects at 3.5mb. I am 1km (as the crow flies) from my exchange.

However, I installed a BT Home Hub for a friend who lives one street away over the weekend and his hub connected 8mb straight away! He's on the same exchange and is only 100yds from my house.

I had resigned myself to getting much less than 8mb, but after this weekend I really want to know why I do, and if there is anything I can do to improve the connection speed.

So here's my info and connection stats - can anyone tell me what my problem is? (so to speak)

Router Stats

From my router (Linksys WAG354G) status page:

DSL Status

DSL Status: Up
DSL Modulation Mode: GDMT
Downstream Rate: 3552 Kbps
Upstream Rate: 448 Kbps
Downstream Margin: 15 db
Upstream Margin: 19 db
Downstream Line Attenuation: 50
Upstream Line Attenuation: 21
Downstream Transmit Power: 0
Upstream Transmit Power: 0

PVC Connection

Encapsulation: RFC 2364 PPPoA
Multiplexing: VC
PCR Rate: 0
SCR Rate: 0
Autodetect: Disable
VPI: 0
VCI: 38
Enable: Yes
PVC Status: Applied

BT Speed Tester

The results from my BT speedtester checks are:

Results from

Test1 comprises of Best Effort Test:

IP profile for your line is - 3000 kbps
DSL connection rate:

448 kbps(UP-STREAM)
3552 kbps (DOWN-STREAM)

Actual IP throughput achieved during the test was - 2203 kbps Speed Test History


Date Speed Achieved (kbps)
01-02-2007 11:33:53 1913.7
01-02-2007 11:33:33 1900.9
28-09-2006 09:50:10 2292.8
28-09-2006 09:49:48 0
28-09-2006 09:49:25 3228.6
27-07-2006 16:49:35 1912.9
10-08-2005 07:46:27 1820.9
10-08-2005 07:45:44 1849.3
13-07-2005 08:00:12 1678.6
21-06-2005 07:49:09 1867.8

I 'upgraded' to 8Mb ADSL in September 2006 - as you can see I usually only get slightly faster speeds than I got from my old 2mb connection!

Any information or help would be appreciated. Can I get or BT to retest my line?


Why can't I get 8mb speed when my neighbours do?

Downstream Line Attenuation: 50

Thats way too high for 8meg, must mean you have a longer line. Ask your neighbour what his atten is
Posts: 343
Registered: 05-04-2007

Why can't I get 8mb speed when my neighbours do?

The speed killer is the 15db downstream margin,at some point bt must have seen an unstable line and ramped up the target margin.You could try asking for this to be reduced but bt will usually say it must have gone this high for a reason.

Why can't I get 8mb speed when my neighbours do?

Thanks for the replies. I'll find out what the stats are for my friends connection.

I have toyed with the idea of switching from PlusNet to (kaff - Zen - kaff) another ISP. Is there likely to be no difference in connection speed if I do? That is to say, I will have the same problem with another ISP as I do now?

Posts: 2,191
Registered: 03-08-2007

Why can't I get 8mb speed when my neighbours do?

If you look at you'll see that with your attenuation on ADSL1 (MaxDSL) others have averaged about 3.5 Mbps or reached a max of 6.5 Mbps.

On the other hand if you could reach a stable 6 dB noise margin without being kicked back to a higher margin you would reach the equivalent of about 2.8 times your present speed or 9.8 Mbps theoretically! Obviously this cannot be achieved with MaxDSL as that limits to 8128 Kbps but it shows what a reasonably stable line can achieve even with the attenuation yours is showing

A question always worth asking is whether you've done all you can to improve your house phone wiring

By the way, the indications are that Zen is on a downward course at present!

Why can't I get 8mb speed when my neighbours do?

Thanks for the info shellsong.

One question - I have an ADSL master socket in my house, and so have no micro filters on my fax machine etc. I have read on this forum however, that putting micro filters on my phone appliance (even though I have a master socket) might be of some use.

Anyone know if it would help?

Second - if I did move to another BT-based ISP, would I still have the same speed?

Many thanks,