ADSL2+ "Output Power" & decrease in speed

At the beginning of the week I was moved over to ADSL2+ and since then my down speed has decreased from around 8032Kbps to 7682 Kbps and I have noticed that my "output power" is 0 dBm for downstream, is this normal? Line Attenuation has increased rather a lot from 40dB to 44.5dB, isn't that a higher than usual jump that you usually get when you change to ADSL2+? Connection just does not seem to be in a good state right now!

Here are my line stats:

Line Mode ADSL2+ Line State Show Time
Line Power State L0 Line Up Time 00:08:07:20
Line Coding Trellis On Line Up Count 1

Statistics Downstream Upstream
Line Rate 7682 Kbps 888 Kbps
Noise Margin 9.4 dB 10.0 dB
Line Attenuation 44.5 dB 23.9 dB
Output Power 0.0 dBm 13.0 dBm
MSGC (number in overhead channel data) 64 10
B (number of bytes in Mux Frame) 110 13
M (number of Mux Frames in FEC Frame) 1 8
T (Mux Frames over sync bytes) 2 9
R (number of check bytes in FEC Frame) 10 16
S (ratio of FEC over PMD Frame length) 0.4603 4.0000
L (number of bits in PMD Frame) 2103 256
D (interleaver depth) 64 8
Delay 7 msec 8 msec
Super Frames 1815013 1815011
Super Frame Errors 86 0
RS Words 254101934 15427593
RS Correctable Errors 55830 21
RS Uncorrectable Errors 1712 0
HEC Errors 78 0
OCD Errors 9 0
LCD Errors 0 0
ES Errors 0 0

You are about right for your attn.

Have you tried in test socket? Any phone extensions? Which ISP?

Maybe you need to wait for it to train.

Yeah it's about right for my attn but should the attn really have increased by 4.5dB when I moved to ADSL2+? I thought it was usually a max of 3dB increase? Surely it's not right I was getting better speed on ADSLMax? =(

No phone extensions, it's plugged in the master socket - a NTE5 adsl filtered faceplate.

ISP is Aquiss.

In reply to a post by IceCream:

it's plugged in the master socket

But is it plugged into test socket behind faceplate? Just in case faceplate faulty,

Nope, not behind the faceplate but I think it would be too much of a coincidence if it went wrong now! I will try it tomorrow though.

Any thoughts on it stating 0 on downstream output power?

There is a clue as to why the speed has dropped - the number of errors going on.

Try forcing the modem to use JUST ADSL2 mode it may provide a more stable service.

0 on downstream output power must be a problem with communications between the router and the DSLAM, probably a chipset interoperability issue. The same sort of thing that leads to no change in signal loss but an increase in the reported loss in some combinations.

Which ISP ?

Thanks MrSaffron, have just forced the ADSL2+ mode, will let you know if it makes any difference =)

yarwell, would it be worth getting a new router? I'm using an old Voyager 2110 that I've had for years with no problems before.

ISP is Aquiss.

is it an LLU service - not sure what Aquiss resell these days - if so try to find the router that gets on best with their LLU provder's kit.

At least try to get your voyager firmware up to date. http://www.voyager.bt.com/wireless_devices/voyager_2...

yarwell, it's not LLU - it's BT Wholesale WBC.

But samknows.com is so wrong right now for my telephone line: It's stating:

You are connected to the Kesgrave telephone exchange.

* ADSL is available in your area
* Your exchange is also enabled for ADSL Max services
* Your exchange is also enabled for ADSL2+ services

According to BT Wholesale, your phone line should be able to support

up to 1Mbps via ADSL
2Mbps or greater ADSL connection via ADSL Max
2.5Mbps or greater via ADSL2+

Firmware is up to date.

Gonna see if I can borrow a friends router and see if there is any change.

In reply to a post by IceCream:

Thanks MrSaffron, have just forced the ADSL2+ mode, will let you know if it makes any difference =)

Pardon?

He said to force ADSL2, not 2+ .

I suspect your router isn't too happy with the ADSL2+.

I'm having the same issue. Had a very nice connection for around 3-4 months with TalkTalk (Speed test around 12-16Mb) and then all of a sudden I've had a terrible drop in speeds to around 1-1.5Mbps. I also noticed that the downstream ouput power was registering at 0 dbm! So you guys are suggesting it might be a router issue? I'm using the D-Link router provided by TalkTalk if that helps.

Stats:


Mode: ADSL2 PLUS
Type: ANNEX_A
Status: Showtime

Downstream Upstream
Rate (Kbps): 20539 kbps 999 kbps

SNR Margin (dB): 6.0 6.4
Attenuation (dB): 17.0 8.6
Output Power (dBm): 0.0 10.3

Regards and thanks

Edited by deleted (Sat 19-Mar-11 20:23:42)