Broadband Related > ADSL Issues

Recap and review, and Statfest

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Weaver:
A few specific, problems and a general question about what you think of the ES and the CRC counts? Especially the upstream.

[Stats for all four lines follow.]

(i) What is a good guideline for the acceptable number of CRCs and ES per unit time? [Apologies if I have asked this before but I would appreciate a recap if need be.]

(ii) Lines 1 and 2 are 300k lower downstream than lines 3 and 4.  Why is this?

They are also 200k lower than they have been historically. Why?

(iii) The upstream on some of the lines seems to be showing a few CRCs and ES. Should I be concerned?

(iv) This is so even on the lines where the upstream SNRM is keeping up at a reasonable level, near 6dB. Opinions? Should I consider raising the upstream target SNRM on those lines?
—

Stats for line 1


--- Code: ---xdslctl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason: 8000
Last initialization procedure status: 0
Max: Upstream rate = 449 Kbps, Downstream rate = 3148 Kbps
Bearer: 0, Upstream rate = 532 Kbps, Downstream rate = 2883 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): 3.1 5.9
Attn(dB): 65.0 40.6
Pwr(dBm): 18.4 12.4

ADSL2 framing
Bearer 0
MSGc: 52 12
B: 33 62
M: 4 1
T: 3 1
R: 10 12
S: 1.4841 3.7267
L: 787 161
D: 2 8

Counters
Bearer 0
SF: 18556726 977626
SFErr: 4 316
RS: 807217590 1501767
RSCorr: 69371 33957
RSUnCorr: 18 0

ReXmt: 2232 0
ReXmtCorr: 2059 0
ReXmtUnCorr: 18 0

Bearer 0
HEC: 20 583
OCD: 2 0
LCD: 2 0
Total Cells: 2051043372 378623893
Data Cells: 19431926 9596608
Drop Cells: 0
Bit Errors: 598 59200

ES: 14 219
SES: 10 0
UAS: 174 164
AS: 301608

Bearer 0
INP: 26.00 2.00
INPRein: 0.00 0.00
delay: 8 7
PER: 16.13 16.77
OR: 28.74 8.58
AgR: 2899.49 538.85

Bitswap: 91436/91517 201/201

Total time = 3 days 19 hours 58 min 36 sec
FEC: 71867 37564
CRC: 450 316
ES: 14 219
SES: 10 0
UAS: 174 164
LOS: 1 0
LOF: 9 0
LOM: 0 0
Latest 15 minutes time = 13 min 36 sec
FEC: 74 72
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: 91 87
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 1 day time = 19 hours 58 min 36 sec
FEC: 14986 9917
CRC: 0 103
ES: 0 72
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Previous 1 day time = 24 hours 0 sec
FEC: 25742 8728
CRC: 1 65
ES: 1 45
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Since Link time = 3 days 11 hours 46 min 47 sec
FEC: 69371 33957
CRC: 4 316
ES: 4 219
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
NTR: mipsCntAtNtr=0 ncoCntAtNtr=0
--- End code ---

Stats for line 2 (which was struggling a bit possibly?):


--- Code: ---xdslctl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason: 8000
Last initialization procedure status: 0
Max: Upstream rate = 421 Kbps, Downstream rate = 3256 Kbps
Bearer: 0, Upstream rate = 515 Kbps, Downstream rate = 2776 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): 3.3 5.4
Attn(dB): 65.0 41.4
Pwr(dBm): 18.2 12.4

ADSL2 framing
Bearer 0
MSGc: 54 11
B: 18 62
M: 8 1
T: 5 1
R: 16 12
S: 1.7231 3.8462
L: 780 156
D: 1 8

Counters
Bearer 0
SF: 16531658 15788
SFErr: 733 70
RS: 619937191 268369
RSCorr: 3085163hhi 21344ggc y> &      C !.’
RSUnCorr: 4013 0

ReXmt: 13353 0
ReXmtCorr: 12801 0
ReXmtUnCorr: 4013 0

Bearer 0
HEC: 3842 130
OCD: 111 0
LCD: 111 0
Total Cells: 1759209296 326831307
Data Cells: 81901041 10719297
Drop Cells: 0
Bit Errors: 98356 10907

ES: 1388 449
SES: 13 0
UAS: 172 172
AS: 268695

Bearer 0
INP: 29.00 2.00
INPRein: 0.00 0.00
delay: 8 8
PER: 16.15 16.34
OR: 29.71 8.32
AgR: 2793.37 522.12

Bitswap: 61805/63872 2759/2759

Total time = 26 days 21 hours 31 min 19 sec
FEC: 3085163 21344
CRC: 733 70
ES: 1388 449
SES: 13 0
UAS: 172 172
LOS: 1 0
LOF: 0 0
LOM: 0 0
Latest 15 minutes time = 1 min 19 sec
FEC: 2 4
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: 48 4
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 1 day time = 21 hours 31 min 19 sec
FEC: 364891 4311
CRC: 354 31
ES: 79 22
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Previous 1 day time = 24 hours 0 sec
FEC: 1222315 8708
CRC: 0 23
ES: 0 17
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Since Link time = 3 days 2 hours 38 min 13 sec
FEC: 3085163 21344
CRC: 733 70
ES: 141 53
SES: 3 0
UAS: 0 0
LOS: 1 0
LOF: 0 0
LOM: 0 0
NTR: mipsCntAtNtr=0 ncoCntAtNtr=0

--- End code ---

Stats for line 3


--- Code: ---xdslctl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason: 8000
Last initialization procedure status: 0
Max: Upstream rate = 302 Kbps, Downstream rate = 3292 Kbps
Bearer: 0, Upstream rate = 376 Kbps, Downstream rate = 3132 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): 2.4 5.7
Attn(dB): 64.5 40.4
Pwr(dBm): 18.4 12.4

ADSL2 framing
Bearer 0
MSGc: 51 11
B: 36 5
M: 4 16
T: 3 8
R: 10 14
S: 1.4888 8.0000
L: 849 110
D: 2 4

Counters
Bearer 0
SF: 121326080 807600
SFErr: 2781 27
RS: 891722660 891916
RSCorr: 2185741 41447
RSUnCorr: 10481 0

ReXmt: 174724 0
ReXmtCorr: 129062 0
ReXmtUnCorr: 10819 0

Bearer 0
HEC: 9484 27
OCD: 113 0
LCD: 113 0
Total Cells: 1468181162 1722842719
Data Cells: 429602891 55990364
Drop Cells: 0
Bit Errors: 422693 3298

ES: 771 69
SES: 100 0
UAS: 1067 986
AS: 1943110

Bearer 0
INP: 26.00 2.00
INPRein: 0.00 0.00
delay: 8 8
PER: 15.91 17.00
OR: 28.65 8.00
AgR: 3147.27 382.50

Bitswap: 389253/390103 25962/25962

Total time = 46 days 19 hours 51 min 24 sec
FEC: 2266530 3559301
CRC: 7111 80
ES: 771 69
SES: 100 0
UAS: 1067 986
LOS: 9 0
LOF: 70 0
LOM: 0 0
Latest 15 minutes time = 6 min 24 sec
FEC: 92 0
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: 94 9
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 1 day time = 19 hours 51 min 24 sec
FEC: 10864 1270
CRC: 0 2
ES: 0 1
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Previous 1 day time = 24 hours 0 sec
FEC: 24956 1386
CRC: 4 2
ES: 3 2
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Since Link time = 22 days 11 hours 45 min 9 sec
FEC: 2185741 41447
CRC: 2781 27
ES: 451 23
SES: 19 0
UAS: 0 0
LOS: 1 0
LOF: 0 0
LOM: 0 0
NTR: mipsCntAtNtr=0 ncoCntAtNtr=0
--- End code ---

Stats for line 4


--- Code: ---xdslctl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason: 8000
Last initialization procedure status: 0
Max: Upstream rate = 439 Kbps, Downstream rate = 3272 Kbps
Bearer: 0, Upstream rate = 499 Kbps, Downstream rate = 3118 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): 2.3 6.2
Attn(dB): 64.5 40.5
Pwr(dBm): 18.4 12.4

ADSL2 framing
Bearer 0
MSGc: 53 11
B: 35 62
M: 4 1
T: 3 1
R: 10 12
S: 1.4545 3.9735
L: 847 151
D: 2 8

Counters
Bearer 0
SF: 231525391 534848
SFErr: 2500 1231
RS: 1655064000 1871824
RSCorr: 872227 558936
RSUnCorr: 10446 0

ReXmt: 117454 0
ReXmtCorr: 102106 0
ReXmtUnCorr: 10646 0

Bearer 0
HEC: 10018 2575
OCD: 93 0
LCD: 93 0
Total Cells: 1807900101 120696083
Data Cells: 779350822 134729470
Drop Cells: 0
Bit Errors: 461531 242852

ES: 490 835
SES: 15 0
UAS: 281 281
AS: 3750352

Bearer 0
INP: 26.00 2.50
INPRein: 0.00 0.00
delay: 8 8
PER: 16.09 16.88
OR: 29.33 8.05
AgR: 3133.75 505.38

Bitswap: 653436/663706 6285/6285

Total time = 46 days 20 hours 39 min 45 sec
FEC: 874599 596969
CRC: 2501 1313
ES: 490 835
SES: 15 0
UAS: 281 281
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 15 minutes time = 9 min 45 sec
FEC: 109 37
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: 238 81
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 1 day time = 20 hours 39 min 45 sec
FEC: 12691 10144
CRC: 1 40
ES: 1 35
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Previous 1 day time = 24 hours 0 sec
FEC: 15100 8426
CRC: 3 5
ES: 3 4
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Since Link time = 43 days 9 hours 45 min 51 sec
FEC: 872227 558936
CRC: 2500 1231
ES: 489 789
SES: 15 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
NTR: mipsCntAtNtr=0 ncoCntAtNtr=0
--- End code ---

Weaver:
Line 2 upstream is going up and down a bit, all over the place, but the waveform height is not great so it is only dropping from 6dB to 5dB, not a big deal, like line 3. After the earlier quoted stats were captured, I initiated an ADSL reconnect, and some time after that, here is the latest day of upstream SNRM history: line #2 upstream SNRM:

hacktrix2006:
Have you tried ADSL1 mode? It could help slightly, is there a pattern with the SNR drops?

SES CRC ES seem decent for your line length, not sure about the LOS (Loss Of Signal) and LOF (Loss of Frame) though.

Weaver:
I used to use ADSL1, for many years, the arrival of ADSL2 gave me a performance boost. I haven’t used it since the end of 2015 and all the DSLAM hardware was upgraded at the time so it isn’t a fair comparison. So to be a fair comparison I would have to look at it again, in isolation.

I would lose all the single bit bins and any other advantages of improvements to the core protocol design. Ought to need to re-read the intro to G.992.3

DiggerOfHoles:
This may help? or not in process.

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