Kitz Forum
Broadband Related => Broadband Technology => Topic started by: tiffy on February 05, 2019, 12:59:55 PM
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Some observations of DLM taking action (US G.Inp application) on BT 80/20 provision line which I remotely monitor 24/7 using a RPi & DSLStats, may be useful for reference as US G.Inp is not that common.
Line has always had DS G.Inp active (re-tx high) and synch's at close to max. DS & US, DS SNRM avg. 3.6 dB, US SNRM avg. 6.8 dB..
Has always run with US avg. 60 ES/Day & avg. 2.5 CRC's/Hr.
For whatever reason on 01/02, DS figures shot up to 5547 ES/Day & 798 CRC's/HR.
DLM intervened in the early hours of 02/02 and applied US G.Inp to the line, DS G.Inp remained acive as previous.
Stats recorded 05 Feb 2019 12:36:46
DSLAM type / SW version: BDCM:0xa48c (164.140) / v0xa48c
Modem/router firmware: AnnexA version - A2pv6F039g1.d24m
DSL mode: VDSL2 Profile 17a
Status: Showtime
Uptime: 3 days 10 hours 34 min 54 sec
Resyncs: 1 (since 01 Feb 2019 23:54:44)
Downstream Upstream
Line attenuation (dB): 17.3 0.0
Signal attenuation (dB): Not available on VDSL2
Connection speed (kbps): 74370 20000
SNR margin (dB): 3.6 6.8
Power (dBm): 12.3 7.1
Interleave depth: 8 8
INP: 49.00 47.00
G.INP: Enabled Enabled
Vectoring status: 5 (VECT_UNCONFIGURED)
RSCorr/RS (%): 0.0409 0.1974
RSUnCorr/RS (%): 0.0000 0.0000
ES/hour: 0 231
Current G.Inp status since DLM re-synch:
Downstream Upstream
General
rtx_tx 26893309 1946
rtx_c 798942 1894
rtx_uc 934455 0
LEFTRS 1693 8
minEFTR 74359 19997
errFreeBits 4210143823 405618472
Bearer 0
RxQueue 80 39
TxQueue 20 13
G.INP Framing 18 18
G.INP Lookback 20 13
RRC Bits 24 24
Interleave depth 8 8
INP 49.00 47.00
INPRein 1.00 0.00
Delay 0 0
Bearer 1
Interleave depth 3 1
INP 4.50 4.00
INPRein 4.50 4.00
Delay 3 0
Not sure if the same criteria can be applied with respect to US Bearer 0 INPRein value (0 or 1) and it's indication of re-tx high/low state as per DS where this is known to be the case ?
Unfortunately, a DSLStats G.Inp status snapshot before DLM re-synch is not available.
With US G.Inp now applied, US ES's & CRC's have been zero ever since, G.Inp in action.
Will be interesting to see what DLM will make of this in the longer term and if US G.Inp will be removed again at some stage.
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Update:
After 14 days running with US G.Inp applied and consequently zero US ES & CRC rates, in early hours today had a DLM re-synch and US G.Inp has been removed, DS G.Inp (re-tx high) remains active as previous.
To date, the US ES & CRC rates appears to have returned to the approx. pre disturbance levels of 01/02 as would be expected, US SNRM has decreased by approx. 1 dB.
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Some further observations which some members may find useful on the other remote line I monitor with a RPi ZW & DSLStats (via VNC), Plusnet VDSL 40/10 provision on a Huawei cabinet , has always had DS G.Inp applied (re-tx low), just had US G.Inp applied this morning.
Current Stats:
Stats recorded 23 Feb 2019 13:28:34
DSLAM type / SW version: BDCM:0xa48c (164.140) / v0xa48c
Modem/router firmware: AnnexA version - A2pvI042r.d26n
DSL mode: VDSL2 Profile 17a
Status: Showtime
Uptime: 2 hours 51 min 3 sec
Resyncs: 1 (since 13 Feb 2019 23:38:32)
Downstream Upstream
Line attenuation (dB): 24.0 0.0
Signal attenuation (dB): Not available on VDSL2
Connection speed (kbps): 34999 8136
SNR margin (dB): 7.9 6.1
Power (dBm): 11.7 4.9
Interleave depth: 16 4
INP: 48.00 46.00
G.INP: Enabled Enabled
Vectoring status: 5 (VECT_UNCONFIGURED)
RSCorr/RS (%): 0.0492 0.0006
RSUnCorr/RS (%): 0.0000 0.0000
ES/hour: 6.08 40.0
Current G.Inp Data Summary:
Downstream Upstream
General
rtx_tx 15948 542
rtx_c 8808 540
rtx_uc 879 0
LEFTRS 109 4
minEFTR 35004 8138
errFreeBits 692035264 1286731
Bearer 0
RxQueue 21 14
TxQueue 7 7
G.INP Framing 18 18
G.INP Lookback 7 7
RRC Bits 24 24
Interleave depth 16 4
INP 48.00 46.00
INPRein 0.00 0.00
Delay 0 0
Bearer 1
Interleave depth 1 1
INP 2.50 4.00
INPRein 2.50 4.00
Delay 0 0
Error History:
Average error rates for 23 Feb 2019
CRC erors per hour: 102 Down, 133 Up
FEC erors per hour: 28325 Down, 114 Up
HEC erors per hour: 0 Down, 0 Up
ES per hour: 5.16 Down, 128 Up
SES per hour: 2.06 Down, 0 Up
Total ES in the day: 70 Down, 1739 Up
Average error rates for 22 Feb 2019
CRC erors per hour: 73.2 Down, 209 Up
FEC erors per hour: 307002 Down, 154 Up
HEC erors per hour: 0 Down, 0 Up
ES per hour: 5.88 Down, 202 Up
SES per hour: 1.46 Down, 0 Up
Total ES in the day: 141 Down, 4842 Up
Average error rates for 21 Feb 2019
CRC erors per hour: 80.3 Down, 40.8 Up
FEC erors per hour: 671300 Down, 33.2 Up
HEC erors per hour: 0 Down, 0 Up
ES per hour: 6.08 Down, 40.0 Up
SES per hour: 1.54 Down, 0 Up
Total ES in the day: 146 Down, 959 Up
Average error rates for 20 Feb 2019
CRC erors per hour: 19.9 Down, 8.79 Up
FEC erors per hour: 122340 Down, 9.00 Up
HEC erors per hour: 0 Down, 0 Up
ES per hour: 4.42 Down, 8.25 Up
SES per hour: 0.04 Down, 0 Up
Total ES in the day: 106 Down, 198 Up
Application of US G.Inp is of course to expectation considering the steady increase of US ES's & CRC's over the last few days, I have monitored this line for over 18 months, back to the MDWS days but have never seen US G.Inp applied at any time, logic assumption being that DLM up to present has never perceived any requirement for intervention due to DS error rates.
If this line follows the form of my other remotely monitored line (different cabinet, same exchange) then US G.Inp will be removed again after approx. 14 days, difficult to know exactly what criteria is applied to that DLM decision as US error rate will be practically zero with US G.Inp applied.