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Author Topic: Same old upstream story for line 3  (Read 174 times)

Weaver

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  • Retd sw dev; A&A; 4 ◊ 7km ADSL2; IPv6; Firebrick
Same old upstream story for line 3
« on: July 25, 2019, 06:59:51 PM »

Iím still getting the same annoying line 3 upstream variation with 24-hour period. See pic, upstream is in green, the square wave:



The target upstream is (supposedly) set at 9dB target SNRM. Now the intention was that the upstream was supposed to drop later following retrain or boot and drop from 9dB to 5dB, not from 6dB to 2dB. Yet for some reason the modem started at 6dB after it was booted or a retrain otherwise triggered, and then later the SNRM dropped right down from that 6dB to ~2dB. So in fact now surprisingly during part of the day the green upstream is actually below the red downstream which is around 3dB where it should be.

This has happened before a good few times. The odd thing is that as far as I can tell I now seem to be getting away with running at 2dB upstream whereas before when this happened, I am pretty certain, I was getting a serious error rate on the upstream that was very detrimental to performance. Iirc I reduced the upstream sync speed and the measured throughput got a lot better.


xdslctl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason:   8000
Last initialization procedure status:   0
Max:   Upstream rate = 250 Kbps, Downstream rate = 3040 Kbps
Bearer:   0, Upstream rate = 412 Kbps, Downstream rate = 2788 Kbps

Link Power State:   L0
Mode:         ADSL2 Annex A
TPS-TC:         ATM Mode(0x0)
Trellis:      U:ON /D:ON
Line Status:      No Defect
Training Status:   Showtime
      Down      Up
SNR (dB):    2.9       2.7
Attn(dB):    65.5       41.4
Pwr(dBm):    18.1       12.4

         ADSL2 framing
         Bearer 0
MSGc:      51      12
B:      32      5
M:      4      16
T:      3      8
R:      10      16
S:      1.4889      7.2846
L:      763      123
D:      2      4

         Counters
         Bearer 0
SF:      14915350      255571
SFErr:      895      9
RS:      637631222      2399862
RSCorr:      36862      265027
RSUnCorr:   7046      0

ReXmt:      59688      0
ReXmtCorr:   54418      0
ReXmtUnCorr:   7309      0

         Bearer 0
HEC:      5529      8
OCD:      196      0
LCD:      196      0
Total Cells:   1572009115      232784059
Data Cells:   43202508      7628938
Drop Cells:   0
Bit Errors:   156506      1014

ES:      401      9
SES:      0      0
UAS:      57      57
AS:      239070

         Bearer 0
INP:      26.00      2.00
INPRein:   0.00      0.00
delay:      8      7
PER:      15.91      16.39
OR:      28.65      8.78
AgR:      2804.62   420.07

Bitswap:   41695/41697      3455/3455

Total time = 2 days 18 hours 25 min 27 sec
FEC:      36862      265027
CRC:      895      9
ES:      401      9
SES:      0      0
UAS:      57      57
LOS:      0      0
LOF:      0      0
LOM:      0      0
Latest 15 minutes time = 10 min 27 sec
FEC:      31      1057
CRC:      0      0
ES:      0      0
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
LOM:      0      0
Previous 15 minutes time = 15 min 0 sec
FEC:      63      1281
CRC:      2      0
ES:      2      0
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
LOM:      0      0
Latest 1 day time = 18 hours 25 min 27 sec
FEC:      2190      57435
CRC:      5      2
ES:      5      2
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
LOM:      0      0
Previous 1 day time = 24 hours 0 sec
FEC:      26280      126705
CRC:      867      5
ES:      385      5
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
LOM:      0      0
Since Link time = 2 days 18 hours 24 min 29 sec
FEC:      36862      265027
CRC:      895      9
ES:      401      9
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
LOM:      0      0
NTR: mipsCntAtNtr=0 ncoCntAtNtr=0


The upstream errors donít look too bad at all? What do you think.

Mind you Iím thinking that the downstream is iffy - itís ok now but had a really bad period in the past which it could not cope with. Does that sound right?
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