My 15.3Mbps adsl doesn't even beat 2Mbps - EVER!!!

After numerous attempts at getting some help from my ISP, SKY, I really need some input from you guys. My wireless router has been sync-ed at 15323kbps for over a month since we had our connection installed however after doing load and loads of speed tests the fastest speed I can ever get is 2.9Mbps over the month.

I'm connected to the router via a brand new ethernet cable. The connection has been steady and has always been sync-ed at 15323kbps. Can anyone help here - Sky are insisting they havent placed a cap on my connection and it should be running at full speed!
---------------------SPEED TEST-------------------------------
Date 11/02/08 23:16:36
Speed Down 2827.01 Kbps ( 2.8 Mbps )
Speed Up 641.81 Kbps ( 0.6 Mbps )
Port 8095
Server 0.0.0.0
---------------------ROUTER STATUS----------------------------------
ADSL Link Downstream Upstream
Connection Speed 15323 kbps 764 kbps
Line Attenuation 21 db 5 db
Noise Margin 11 db 16 db

-------------DSL Diagnostics---------------------------

� SpeedGuide.net TCP Analyzer Results �
Tested on: 02.11.2008 18:17
IP address: 90.198.xxx.xxx

TCP options string: 020405b401010402
MSS: 1460
MTU: 1500
TCP Window: 17520 (multiple of MSS)
RWIN Scaling: 0
Unscaled RWIN : 17520
Reccomended RWINs: 64240, 128480, 256960, 513920
BDP limit (200ms): 701kbps (88KBytes/s)
BDP limit (500ms): 280kbps (35KBytes/s)
MTU Discovery: ON
TTL: 107
Timestamps: OFF
SACKs: ON
IP ToS: 00000000 (0)

Any help is greatly appreciated. This is extremely frustrating and I'm getting no help from Sky.

Chris

If you are using windows XP, download DRTCP http://www.dslreports.com/drtcp select your ethernet adaptor, enable window scaling and then increase rwin (TCP Receive Window) substantially.

Edited by AbandonShip (Tue 12-Feb-08 01:17:43)

Firstly you're using a rubbish speed tester! I done a test and only got 1.3 mbps and always get 13~14 mbps from other sites.

Try the one here at thinkbroadband or the one at speedtest.net. Then report back.

Have you tried running TCP Optimizer? Custom settings, slide the slider up to 15Mb, apply changes & re-boot.

http://www.speedguide.net/downloads.php

As above, TCP Optimizer made a vast difference to my data throughput.

If you are syncd at that, you should get pretty decent speeds - are you SNR stats OK as if they were marginal then you would get a lot of errors.

Edited by deleted (Tue 12-Feb-08 12:17:46)