I'm guessing that the --snr is partially a percentage value, for example 100 being default, 50 being -3dB or some decrement below the DSLAM's target SNR margin, and 150 being +3dB. Perhaps I'm wrong but that's a guess after all. I haven't tried this as I don't want to keep doing unnecessary syncs to bump up my depth.

Talking ADSLx!

Yes it's a percentage of the DSLAM setting. Bear in mine that the "dB" is a logarithmic figure and that a change of 3dB is approximately a halving or doubling.

So if the DSLAM setting is 6dB, --snr 50 will result in around 3dB. If the DSLAM is 9dB then --snr 50 will result in around 6dB.

If you want to add stability, then to get from 6dB to 9dB it is --snr 200. To get to 12dB from 6dB it is --snr 400.

On FTTC/VDSL2 the Openreach DSLAM/DLM doesn't seem to work that way, but I'm saying that based on just a few tries, as I said earlier.

Fair enough, well I might give it a try, but given DLM is in the back of my mind I don't really want to upset it so I probably won't experiment at all.

In reply to a post by driz:

I'm 12 hours later than promised, but here we are. I get 5-6ms to my first hop.

1 <1 ms <1 ms <1 ms 192.168.1.254
2 6 ms 5 ms 5 ms 217.32.147.97

Text

1 23 45 67 89 1011 1213 1415 1617 1819 2021 2223 2425 2627 2829 3031 3233 3435 3637 3839 4041 4243 4445 4647 4849 5051 5253 5455 5657 58

# xdslcmd info --stats xdslcmd: ADSL driver and PHY statusStatus: Showtime Retrain Reason: 0Max:    Upstream rate = 33119 Kbps, Downstream rate = 88236 Kbps Path:   0, Upstream rate = 20000 Kbps, Downstream rate = 79999 Kbps  Link Power State:       L0Mode:                   VDSL2 Annex B VDSL2 Profile:          Profile 17aTPS-TC:                 PTM Mode Trellis:                U:ON /D:ONLine Status:            No Defect Training Status:        Showtime                Down            Up SNR (dB):        8.3             14.8Attn(dB):        0.0             0.0 Pwr(dBm):        12.4            6.8                        VDSL2 framing                         Path 0B:              239             237 M:              1               1T:              23              45 R:              0               16S:              0.0955          0.3782 L:              20107           5373D:              1               1   <----------------------------------- I:              240             127N:              240             254                         Counters                        Path 0 OHF:            115012215       3943928OHFErr:         170658          796 RS:             0               4293740RSCorr:         0               17195 RSUnCorr:       0               0                          Path 0HEC:            906477          0 OCD:            0               0LCD:            0               0 Total Cells:    405528636       0Data Cells:     531377316       0 Drop Cells:     0Bit Errors:     0               0  ES:             50126           243 SES:            83              40UAS:            17              17 AS:             7292543                          Path 0INP:            0.00            0.00   <--------------------------------- PER:            1.64            4.25delay:          0.00            0.00   <--------------------------------- OR:             116.56          60.17  Bitswap:        521020          17724

D = 1 = fast path (no interleaving)
delay = 0 = delay from interleaving (in microseconds)
INP = 0 = impulse noise protection (a result of interleaving)


See the excellent work of "JustAnother" here: http://forum.kitz.co.uk/index.php?topic=11113.0

cheers, a

Edited by deleted (Fri 31-Aug-12 15:22:45)