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Standard User David_W
(fountain of knowledge) Mon 25-May-15 13:53:16
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Are Openreach disabling upstream G.INP?


[link to this post]
 
My FTTC resynchronised recently its own accord. I'm on a Huawei cabinet with an unlocked HG612 with B030SP08 firmware.

You can see my previous xdslcmd info --show in an old post (click) and I've posted my new xdslcmd info --show below.

The older information shows G.INP in use in both directions. The new information shows no interleaving on the main upstream connection (D on Bearer 0 is 1), and no G.INP framing or lookback either. There is some hint of upstream G.INP previously being active in some of the counters, as they don't all appear to have reset on the resynchronisation. That said, unless I'm missing something, it seems clear that G.INP is now only active on my downstream.


This raises the possibility that Openreach's fix for the G.INP problems is disabling upstream G.INP across the board. If so, this is a shame for people like me who have CPE and a DSLAM that are both capable of bidirectional G.INP.

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# xdslcmd info --show
xdslcmd: ADSL driver and PHY statusStatus: Showtime
Retrain Reason: 1Last initialization procedure status:   0
Max:    Upstream rate = 31537 Kbps, Downstream rate = 96928 KbpsBearer: 0, Upstream rate = 19999 Kbps, Downstream rate = 79999 Kbps
Bearer: 1, Upstream rate = 0 Kbps, Downstream rate = 0 KbpsLink Power State:       L0
Mode:                   VDSL2 Annex BVDSL2 Profile:          Profile 17a
TPS-TC:                 PTM Mode(0x0)Trellis:                U:ON /D:ON
Line Status:            No DefectTraining Status:        Showtime
                Down            UpSNR (dB):        10.6            15.3
Attn(dB):        13.0            0.0Pwr(dBm):        12.5            2.9
                        VDSL2 framing                        Bearer 0
MSGc:           -6              26B:              130             237
M:              1               1T:              0               42
R:              8               16S:              0.0518          0.3781
L:              21468           5374D:              16              1
I:              139             127N:              139             254
Q:              16              0V:              14              0
RxQueue:                60              0TxQueue:                20              0
G.INP Framing:          18              0G.INP lookback:         20              0
RRC bits:               0               24                        Bearer 1
MSGc:           186             -6B:              0               0
M:              2               0T:              2               0
R:              16              0S:              5.3333          0.0000
L:              48              0D:              3               0
I:              32              0N:              32              0
Q:              0               0V:              0               0
RxQueue:                0               0TxQueue:                0               0
G.INP Framing:          0               0G.INP lookback:         0               0
RRC bits:               0               0                        Counters
                        Bearer 0OHF:            0               2496023
OHFErr:         54              0RS:             2052524192              3083178
RSCorr:         67979           0RSUnCorr:       0               0
                        Bearer 1OHF:            1661260         0
OHFErr:         0               0RS:             19934381                0
RSCorr:         0               0RSUnCorr:       0               0
                         Retransmit Counters
rtx_tx:         183843          103rtx_c:          115746          146
rtx_uc:         49594           0 
                        G.INP CountersLEFTRS:         391             5
minEFTR:        79982           20003errFreeBits:    1154333263              1819682500
                         Bearer 0
HEC:            0               0OCD:            0               0
LCD:            0               0Total Cells:    4104781117              0
Data Cells:     11121609                0Drop Cells:     0
Bit Errors:     0               0 
                        Bearer 1HEC:            0               0
OCD:            0               0LCD:            0               0
Total Cells:    0               0Data Cells:     0               0
Drop Cells:     0Bit Errors:     0               0
 ES:             141             0
SES:            46              0UAS:            57              46
AS:             26685 
                        Bearer 0INP:            48.00           0.00
INPRein:        0.00            0.00delay:          0               0
PER:            0.00            3.98OR:             0.01            64.22
AgR:            80614.82        20063.54 
                        Bearer 1INP:            4.00            0.00
INPRein:        4.00            0.00delay:          3               0
PER:            16.06           0.01OR:             95.62           0.01
AgR:            95.62   0.01 
Bitswap:        15592/15592             8/8


Standard User Alnath
(fountain of knowledge) Mon 25-May-15 16:37:17
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Re: Are Openreach disabling upstream G.INP?


[re: David_W] [link to this post]
 
It was announced a while ago that this was the fix.
Standard User David_W
(fountain of knowledge) Mon 25-May-15 16:42:35
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Re: Are Openreach disabling upstream G.INP?


[re: Alnath] [link to this post]
 
In reply to a post by Alnath:
It was announced a while ago that this was the fix.
It was clear that something like this would be the fix for lines where bidirectional G.INP could not be supported, because of DSLAM and/or CPE limitations.

My surprise is that upstream G.INP has been disabled on a line where both DSLAM and CPE support bidirectional G.INP and were working correctly with bidirectional G.INP.


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Standard User RobertoS
(elder) Mon 25-May-15 17:27:55
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Re: Are Openreach disabling upstream G.INP?


[re: David_W] [link to this post]
 
Mine's still got it on both down and up, though whether it would if I did a reconnection I'm not going to deliberately find out.

My broadband basic info/help site - www.robertos.me.uk. Domains, site and mail hosting - Tsohost.
Connection - Plusnet UnLim Fibre (FTTC). Sync 60000/16961kbps @ 600m. - IPv4BQM IPv6BQM
Standard User Chrysalis
(legend) Mon 25-May-15 17:55:22
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Re: Are Openreach disabling upstream G.INP?


[re: David_W] [link to this post]
 
it is an issue I guess, but not a major one.

The amount of people requiring DLM intervention for upstream issues is small, and all the publicly known ones were due to a obvious fault which openreach fixed.

Which is the bigger evil.

Not having g.inp on an upstream that may negatively affect say 0.5% of lines?
Or enabling it and having ALL eci users have a significant latency and sync speed hit, estimate 40% of lines on hauwei cabinets or 70% of lines across entire openreach coverage.

Plusnet Fibre Unlimited BQM - IPv4 BQM - IPv6
Standard User stuartfletcheruk
(newbie) Tue 26-May-15 00:03:40
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Re: Are Openreach disabling upstream G.INP?


[re: Chrysalis] [link to this post]
 
Happened on my line the other day.

Upstream dropped from 19999 sync with roughly 18.5 Mb/s achievable to 17361 sync with 15.5Mb/s

Almost 20% drop in upstream speed so not that impressed. I often VPN into my own Internet connection when travelling and the upstream speed is key

Stuart
Standard User AndyPandy
(fountain of knowledge) Tue 26-May-15 11:46:48
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Re: Are Openreach disabling upstream G.INP?


[re: stuartfletcheruk] [link to this post]
 
I has a resync this morning, but still have G.INP on both upstream and downstream.

I've got a Fritzbox connected to a Huawei cab.


ZeN Unlimited Fibre 2
Fritz!Box 3390
Standard User WWWombat
(knowledge is power) Tue 26-May-15 14:26:05
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Re: Are Openreach disabling upstream G.INP?


[re: David_W] [link to this post]
 
It does look like the "fix" has ended up removing g.inp from upstream, even with working combinations of modem/DSLAM.

It could equally be that BT has decided it isn't needed, as there were fewer errors on the upstream. I doubt that is the motivation though.

Of course, it could just be that it has been taken away from the default profile, and DLM will add it back only after an error threshold has been reached AND the modem/DSLAM combination works.

I have a Billion 8800NL, on a Huawei DSLAM, and still have g.inp active both ways.
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