How bad are these line stats?

Lethal`

Lethal`

Lethal`

Soldato
Joined
25 Oct 2006
Posts
5,395
Trying to diagnose a very slow TalkTalk connection, and wondered if someone could give an opinion on the speeds to expect with these stats.

Upstream line rate (kbit/s) 786
Downstream line rate (kbit/s) 4662
Line standard ADSL2+
Channel type
Interleaved
Upstream SNR (dB) 14.9
Downstream SNR (dB) 15.1
Upstream line attenuation (dB) 15
Downstream line attenuation (dB) 26.5
Upstream output power (dBmV) 11.5
Downstream output power (dBmV) 20
Upstream CRC 2490326
Downstream CRC 19921
Upstream FEC 4783993
Downstream FEC 36322772

They don't strike me as particularly good, currently getting under 1Mbps... :(
 
i had 12mb connection with line attenuation of 30db, with downstream SNR of 6db.

try lower the downstream SNR to 6db if the router allow you. what router is it?
 
Type :
ADSL2+ Annex A

Line Rate (Up / Down) :
1313 Kbps / 18520 Kbps

Noise Margin (Up / Down) :
7.1 dB / 6.2 dB

Attenuation (Up / Down) :
14.7 dB / 25 dB

Power (Up / Down) :
12.2 dBm / 18.4 dBm

Yours should be like mine as they have just about the same attentuation, you deff should see much more than you currently do!

Where is the broadband box and have you tried plugging it into the BT test socket with with only that connected via a filter?
 
Pretty awful where I'm at :(
Maximum Bandwidth (Up/Down) [kbps/kbps]: 1,284 / 3,288
Bandwidth (Up/Down) [kbps/kbps]: 1,107 / 2,976
Data Transferred (Sent/Received) [kB/kB]: 0.00 / 0.00
Output Power (Up/Down) [dBm]: 12.0 / 17.5
Line Attenuation (Up/Down) [dB]: 31.0 / 48.0
SN Margin (Up/Down) [dB]: 6.0 / 13.5
 
wesley said:
i had 12mb connection with line attenuation of 30db, with downstream SNR of 6db.

try lower the downstream SNR to 6db if the router allow you. what router is it?
Click to expand...

I don't think it will allow... it's a HUAWEI echolife hg521 (... yeah)

pokerking said:
Yours should be like mine as they have just about the same attentuation, you deff should see much more than you currently do!

Where is the broadband box and have you tried plugging it into the BT test socket with with only that connected via a filter?
Click to expand...

I think it is plugged into the master socket. Thing is it's a friends connection, so I can't really go unscrewing the socket to use the test... although I may have to.
 
Last edited:
Downstream line attenuation (dB) 26.5

For that attenuation your downstream speed is very poor, and the SNR is high, which has most likely been caused by a fault on your line.

Please ring you isp to assist you - as posting stats on here will not fix it.
 
Lethal` said:
Trying to diagnose a very slow TalkTalk connection, and wondered if someone could give an opinion on the speeds to expect with these stats.

Upstream line rate (kbit/s) 786
Downstream line rate (kbit/s) 4662
Line standard ADSL2+
Channel type
Interleaved
Upstream SNR (dB) 14.9
Downstream SNR (dB) 15.1
Upstream line attenuation (dB) 15
Downstream line attenuation (dB) 26.5
Upstream output power (dBmV) 11.5
Downstream output power (dBmV) 20
Upstream CRC 2490326
Downstream CRC 19921
Upstream FEC 4783993
Downstream FEC 36322772

They don't strike me as particularly good, currently getting under 1Mbps... :(
Click to expand...

So of interest there is the 4.6Mbit connection speed but you are only seeing 1 Mbit speed, that's Talk Talk not giving good throughput.

Your SNR is quite high, but not as high as you'd expect on a clean line throttled down to 4.6 Mbit. Might be a bad or noisy line.

The CRC counters are very high. It's unclear how long these figures have been building but 20,000 Down and 2,490,326 Upstream errors is massively high. You shouldn;t really have more than 1 or 2 of these a day. Just for comparison my modem has been up for 34 hours and I'm waiting on the first CRC, up or down. CRC are uncorrectable errors where the remote device cannot reconstruct the data packet and requests a resend.

Any idea how long the uptime on the modem is?

As a guess I'd say this line has excessive noise, possibly caused by dodgy internal wiring. Best way to test is by putting the modem directly into the test socket with no telephones or extensions attached and check for any difference in readings of Attenuation, SNR, connection speed and CRC errors.
 
I went home and grabbed my old netgear DG834GT, instantly the connection was improved to about 4Mbps... then I tweaked the SNR and I now get 5.5Mbps - 6Mbps.

Code: 
System Up Time 00:26:33
Port	Status	TxPkts	RxPkts	Collisions	Tx B/s	Rx B/s	Up Time
WAN	PPPoA	10082	13248	0	2806	15965	00:13:24
LAN	10M/100M	15843	12225	0	9822	1796	00:26:30
WLAN	11M/54M/108M	6815	7144	0	6067	1738	00:09:01

ADSL Link	Downstream	Upstream
Connection Speed	7191 kbps	864 kbps
Line Attenuation	27.5 db	13.7 db
Noise Margin	9.6 db	18.6 db
 
That's good but for your line length your speed *should* be much better - as plugging your attenuation into here shows.

As Locky says you need to get onto your ISP to sort it out.
 
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