Our FTTC connection has been getting slower and slower since it was installed back in 2012. I took a photo of the engineer's meter on installation day (FTTC had an engineer visit back then). During the training period, the sync speed increased from this to 45Mb/s down and 7Mb/s up and was stable for a couple of years.
Over the past 4 years, however, the speed has gradually degraded with the downstream sync speed falling by 25%. This is what we currently get.
Here are the full router stats:
---------------------- ATU-R Info (hw: annex A, f/w: annex A/B/C) ----------- Running Mode : 17A State : SHOWTIME DS Actual Rate : 32394000 bps US Actual Rate : 5677000 bps DS Attainable Rate : 36814824 bps US Attainable Rate : 5758614 bps DS Path Mode : Fast US Path Mode : Fast DS Interleave Depth : 1 US Interleave Depth : 1 NE Current Attenuation : 25 dB Cur SNR Margin : 8 dB DS actual PSD : 5. 2 dB US actual PSD : 5. 2 dB NE CRC Count : 3714 FE CRC Count : 198 NE ES Count : 3248 FE ES Count : 154 Xdsl Reset Times : 0 Xdsl Link Times : 1 ITU Version : b5004946 ITU Version : 544e0000 VDSL Firmware Version : 05-07-06-0D-01-07 [with Vectoring support] Power Management Mode : DSL_G997_PMS_L0 Test Mode : DISABLE -------------------------------- ATU-C Info --------------------------------- Far Current Attenuation : 35 dB Far SNR Margin : 6 dB CO ITU Version : b5004946 CO ITU Version : 544eb206 DSLAM CHIPSET VENDOR : < IFTN >
What is notably different though is the target SNR which was originally 6 and is now 8. The stats show the maximum attainable rate is 36.8Mbps. We did go through a period a few years ago where we had a large number of power cuts due to a major underground electrical fault in our neighbourhood. Is it possible that the DLM has never recovered from this? Looking at this linked article, since 2016 the target SNR should now be 3 which I imagine would increase the line speed.
Would a Mod be able to request a DLM reset to initiate another 10 day training period, please?
Thanks in advance for your help.
Thanks. The target SNR *should* be 6 rather than 3. I saw at the bottom of the article I linked that the ECI cabinets are excluded from the SNR 3 target rollout.
I am still keen to understand why the SNR is currently 8 though as we have confirmed it should be 6.
Have you checked for line noise? 17070 option 2 any noise should be reported as a line fault not broadband.
Thanks, I have just tried that but there is no noise on line, other than a faint hiss. I also tried a line test online and that came back clear.