Upstream suddenly dropped?

Hi guys,

Hope you can help me on this one - over the past two days, my upstream has suddenly dropped from a consistent 448kbps to speeds varying from 150-256kbps. I notice that the upstream SNR is now also sitting at around 6db, whereas I think it used to be about 27db. Downstream is OK, but attenuation has improved from 51db to 47db. Prior to this, my line has synced at a solid 6mbps.

I've tried two different routers, currently using a 2Wire HGV2700 and have made no cabling alterations. Router is plugged straight in to the master NTE with a service specific face plate, so no extensions or filters.

Line stats are as follows:

Modem Type: Built in modem - ADSL
DSL Line (Wire Pair): Line 1 (inner pair)
Current DSL Connection:
Down Up
Rate: 5120 kbs 224 kbs
Max Rate: 5120 kbs 236 kbs
Noise Margin: 9.0 dB 6.0 dB
Attenuation: 48.1 dB 28.0 dB
Output Power: 19.8 dBm 12.3 dBm

Protocol: G.DMT Annex A
Channel: Interleaved
DSLAM Vendor Information Country: {46336} Vendor: {TSTC} Specific: {0 }
ATM PVC: 0/38

Rate Cap: 5120 kbs
Attenuation @ 300kHz: 48.1 dB
Uncanceled Echo: -15.2 dB Ok
VCXO Frequency Offset: 22.4 ppm Ok
Final Receive Gain: 27.5 dB Ok
Impulse Noise Comp. Tones: 0 Ok
Excessive Impulse Noise: 0 Ok
Traffic Statistics

IP Traffic Bytes Packets Errors %
Transmit: 79392 300 0 0
Receive: 67289 218 0 0

ATM Traffic Cells Errors %
Transmit: 17778 0 0
Receive: 32770 0 0
DSL Link Errors

Collected for 9:03:25

Since Current Current Time Since
Reset 24-hr int. 15-min int. Last Event
ATM
Last Event
Cell Header Errors 99 99 0 0:12:24
Loss of cell Delineation 77 77 0 0:12:24

DSL
Link Retrains: 3 3 0 0:12:23
DSL Training Errors: 0 0 0 0:00:00
Training Timeouts: 0 0 0 0:00:00
Loss of Framing Failures: 2 2 0 0:12:24
Loss of Signal Failures: 1 1 0 0:12:25
Loss of Power Failures: 0 0 0 0:00:00
Loss of Margin Failures: 1 1 0 0:12:25
Cum. Seconds w/Errors: 15 15 0 0:12:24
Cum. Sec. w/Severe Errors: 2 2 0 0:12:24
Corrected Blocks: 599 599 8 0:00:16
Uncorrectable Blocks: 98 98 0 0:12:24
DSL Unavailable Seconds: 258 258 0 0:09:20

Hope you can help with this one!

Cheers
Chris

Edited by ChrisH (Mon 21-Dec-09 18:17:38)

Anyone?

The connection has synced back up at the correct 448kbps upstream on a few occasions today with an upstream SNR of 28db - however, it has dropped out several times and is now back at a 6db SNR with upstream sync of 160kbps...

For what it's worth, I have also noticed that there is a really noticeable hiss from the router that can be heard on the line when it is syncing at the lower speed - tried with a different SSFP to no avail.

Thanks
Chris

Edited by ChrisH (Mon 21-Dec-09 18:17:24)

Hi ChrisH,

The most probable causes are:

Filter dying; have you tried a new one?

Modem dying, again have you tried another one?

Do you have a Master socket (NTE5) with a test socket inside?

Sounds like you have an intermittent connection caused by a corroded joint somewhere. This could be anywhere between you master socket and the exchange. You need to get your ISP involved, who will get BT on the case.

Had a similar issue with Entanet, who were useless in dealing with it & allowed BT to fob them off - eventually phoned the complaints dept at BT, was lucky & got someone there who had been a faults manager & he raised a fault based on it being intermitently noisy (there was a background beep tone) - local engineer found nothing but got permission to eavesdrop onto the line & heard the tone! - to his credit he kept searching & eventually found a cable fault in a duct - DESPITE all BT's previous tests claiming there was no fault. Was so sick & tired of BT/Enta that I have moved the line to Be/O2 who are excellent - line speeds hugely increased, no lag - just a completely different standard of internet connection!