Newly registered, but have been lurking for some time. I see various requests for DLM resets due to reduced sync speeds after a fault.
I've recently been going through a load of building work, which resulted in several power outages. For the last few years I've always been able to sync at ~80Mbps down, but I'm now stuck at ~66Mbps?
Line stats look fine (SNR varies between 8dB and 12dB depending on time of day). I've since left my line up for 30+ days without reboot but DLM doesn't appear to have backed off yet.
Any ideas how I can 'kick it' or request a reset?
vdsl status ---------------------- ATU-R Info (hw: annex A, f/w: annex A/B/C) ----------- Running Mode : 17A State : SHOWTIME DS Actual Rate : 66997000 bps US Actual Rate : 19999000 bps DS Attainable Rate : 75732852 bps US Attainable Rate : 27990000 bps DS Path Mode : Fast US Path Mode : Fast DS Interleave Depth : 1 US Interleave Depth : 1 NE Current Attenuation : 12 dB Cur SNR Margin : 9 dB DS actual PSD : 0. 4 dB US actual PSD : 13. 4 dB NE CRC Count : 0 FE CRC Count : 7028 NE ES Count : 0 FE ES Count : 5540 Xdsl Reset Times : 0 Xdsl Link Times : 1 ITU Version : fe004452 ITU Version : 41590000 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 : 12 dB Far SNR Margin : 10 dB CO ITU Version : b5004244 CO ITU Version : 434dc01c DSLAM CHIPSET VENDOR : < BDCM >
can you enter your phone number and post results leave exchange and cab but delete number
is there any line noise which may be a problem dial 17070 option 2 should be silent and best with corded phone
i wouldn't expect a noise margin to fluctuate so much from 8 to 12db
Thanks for the quick info, @imjolly
I'll check internal cable (Draytek Vigor 130 connected directly to the master socket) and line noise shortly. I'm only questioning the building work as I've been stable for 4+ years at 80Mbps and all of a sudden it's dropped.
Might be a red-herring though... just curious if repeated power cuts were a legitimate explanation or whether it's possible to infer DLM is active (i.e. specific rate steps)?
I'll start logging SNR via SNMP so I can build up a picture of how it's changing. The range above was noticed during spot-checks, but I agree the +/- 4dB is concerning (EE background - totally get logarithmic scale).
|Up to 5.5||--||4.5 to 6.5||Available||Available||--|
|Up to 5.5||Up to 1||4.5 to 6.5||Available||Available||--|
|Up to 4||--||3 to 7||Available||Available||--|
Ok after recording the statistics for a few days.... things are just super-weird. I even bought a second Vigor130 as I figured my modem was broken....
Here's a graph of SNR, the current/attainable sync speeds, line attenuation, and uptime.
Modem booted at 14:20 yesterday. DSL cable reseated at 22:00 last night (note the SNR recovers immediately when resyncing).
Any ideas?! I've sent this to Draytek too for their opinion...
Ok - suspect this is a Vigor issue (either Lantiq chip compatibility with my cabinet or a firmware issue). I switched back to the old HG612 (unlocked it for stats) and it's night and day....
The below has two different Vigor 130 in use (I bought a 2nd in shear frustration)....
Any chance of the moderators performing a remote DLM reset? I've now been stable on the HG612 for over a week, and the attainable speed is ~81Mbps (and constant SNR of 10dB).
It takes a few weeks of stable connection not just 7 days before DLM will start to improve your connection