I’ve been having problems with my Talktalk Business ADSL2+ (LLU) connection, and would appreciate comments on the BQM trace here.
Laptop just left on to log Routerstats data from 6pm to 10am, otherwise the rises in max latency coincide with internet activity.
Back in May I was having increasing problems with loss of connection and download speeds seeming to get slower with time. I also felt that at around 2Mb/s, it was not close to the 3.5 – 4 Mb/s that line speed estimators were coming up with. TTB support ran a line check and said there was “voltage on the line”, and after that was sorted I negotiated SNR down from 12 to 6dB.
(TTB advise that the line length is 3000m, which sounds as though the actual number has been rounded off, but is consistent with the point to point distance of 1645m to the exchange (WWPENZ)).
Since then I’ve been tracking performance with Routerstats, which has shown repeated re-syncs (17 yesterday), which explains the losses of connection. SNR also varies frequently, dropping to 3 dB or lower, but also increasing from time to time. (If some kind person can advise how to post pictures, I’ll put a typical day’s traces up – one for the FAQs?)
Again contacted TTB, who again said there was “voltage on the line”. When I chased them up, they said the line was now OK. They could arrange a callout, but charges would be made if they found a problem on my side.
Obviously I want to check everything out to eliminate any potential culprits before I commit to that. I’ve done all the usual checks – swapped filters, verified via the master test socket. Nothing untoward so far, and as usual, I can’t find any significant difference between the test socket and the extension I normally use; all connections via Ethernet, no wireless. The only other thing I can think of is to swap the router with one at another property we’ve got in the vicinity.
DSL Status - 10:50 Thursday 11th July 2013
DSL Status: Up
DSL Modulation Mode: ADSL2+
DSL Path Mode: INTERLEAVED
Downstream Rate: 2435 Kbps
Upstream Rate: 840 Kbps
Downstream Margin: 6 db
Upstream Margin: 6 db
Downstream Line Attenuation: 53
Upstream Line Attenuation: 35
Downstream Transmit Power: 0
Upstream Transmit Power: 0
Encapsulation: RFC 2364 PPPoA
PCR Rate: 0
SCR Rate: 0
PVC Status: Applied
Setup: Router - Linksys WAG354G (v1), Dell Inspiron N5110, W7 Pro (64bit), Norton Internet Security, Buffalo LS-LG NAS, WD My Book Essential USB2