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Author Topic: Slowing upstream  (Read 2730 times)

shaun1264

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Slowing upstream
« on: August 12, 2018, 01:45:41 PM »

Got a little problem here. My upstream seems to be getting slower and slower.  2 months ago it was at the normal 7mbps but now it's been creeping down to around 2mbps.  Downstream seems fine and stable around 47mpbs on a 3db profile.  G.inp on the downstream and g.inp went off this morning on the upstream.  Not sure what would cause this strange slow down on upstream of speed when download seems fine.    Modem is a Technicolour DGA4132 .   Tried with a Billion 8800nl r2.   Similar findings.  Power output on upstream stands out?   Service provider Plusnet.

Parameters   Total   Current Quarter   Previous Quarter   Current Day   Previous Day   Since Sync
Upstream FEC   92157   0   12   0   12   0
Downstream FEC   18365359   504   16112124   6096   16112124   88730
Upstream CRC   114   0   0   50   47   0
Downstream CRC   514   0   0   8   15   0
Upstream ES   60   0   0   13   6   5
Downstream ES   336   0   0   63   84   7
Upstream SES   48   0   0   10   4   5
Downstream SES   217   0   0   62   82   7
Upstream UAS   354   0   0   59   120   0
Downstream UAS   524   0   0   104   190   0
Upstream LOS   0   0   0   0   0   0
Downstream LOS   83   0   0   20   40   0
Upstream LOF   0   0   0   0   0   0
Downstream LOF   83   0   0   20   40   0
Upstream LOM   0   0   0   0   0   0
Downstream LOM   76   0   0   23   30   0
Framing parameters
R
 0  10
S
 0.8025  0.1518
D
 1  4
L
 319  12539
N
 32  238
OR
 28.24  0.01
INP
 0  57
Delay
 0  0
Trellis
 On  On
G.INP stats
Status
ReXmt
 0  2117
ReXmtCor
 0  369
ReXmtUnc
 0  39512
RxQueue
 0  112
TxQueue
 0  16
LookBack
 0  16
RRCBits
 24  0
LEFTRS
 0  7
minEFTR
 0  47764
ErrFreeBits
 0  316232448
Vectoring stats
ErrS Packet Send
0
ErrS Packet Drop
0
ErrS Stat Send
0
ErrS Stat Drop
0
Direction Mode
0
Rx BitSwap Mode
0
Disable VN Mode
0
VCE Address
00:00:00:00:00:00
A2pvfbH043k.d26r
Close
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shaun1264

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Re: Slowing upstream
« Reply #1 on: August 12, 2018, 01:47:16 PM »

Physical link status
DSL Status
Up
DSL
enabled
DSL Uptime
2 hours 27 minutes 7 seconds
Maximum Line rate
 1.24 Mbps  49.27 Mbps
Line Rate
 1.24 Mbps  47.75 Mbps
Data Transferred
 3293.47 MBytes  3702.25 MBytes
Output Power
 -9.5 dBm  11.3 dBm
Line Attenuation
 8.0, 36.7,N/A dB  16.9, 45.2, 69.2 dB
Noise Margin
 6.2 dB  3.1 dB
Internet channel
Using VLAN
VLAN enabled
VLAN ID
101
Close
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re0

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Re: Slowing upstream
« Reply #2 on: August 12, 2018, 02:16:31 PM »

Immediately I can see from the overview that only U0 and U1 have an attenuation value, with U1 being quite attenuated (which means it may be fairly limited in what can be allocated in that). U2 seems to be attenuated beyond what is usable. May indicate why your upstream is limited.

Do you know when your cabinet was enabled, and how long after it was enabled did you sign up (when did you subscribe to your service)? Dropping upstream speeds could be the typical signs of crosstalk increasing.

If you're using the 8800NL R2, you should be able to use https://kitz.co.uk/routers/hg612stats.htm to get a graphical overview of your current stats. This will represent a lot of the modem's statistics in a graphical form which you can then upload to this topic. If you download the zip, unzip it and configure the main program in "Scripts" then you will be able run "HG612_current_stats.exe" after which will graph the stats in the "Current_Stats" in the root folder.

Note: I am not sure if the DGA4132 will work the program, but if it is unlocked (with telnet access) and has a Broadcom chipset like I believe then it should still be possible to configure.
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shaun1264

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  • Posts: 39
Re: Slowing upstream
« Reply #3 on: August 12, 2018, 02:25:45 PM »

Cabinet is no.1 cabinet in Godalming, Surrey. This has been there for many years.  It's had a add on side box installed last year.  At the moment it has a red workman barrier around it and been like that for several weeks now. 

I'll try and get some more stats when I'm back.  At the moment I can't get dslstats to work with the technicolour. Connects but doesn't return data.  It did work but stopped for some reason. 

I forgot to say  the Billion 8800nl r2 router would lock up and freeze when connected behind the MK4 faceplate in the test socket.   It would be fine using the normal socket.  Interference?   

Back in November Openreach moved me on to another backhaul? As they said it was congested on the one I had after I reported slow downstream.
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re0

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Re: Slowing upstream
« Reply #4 on: August 12, 2018, 03:36:29 PM »

Cabinet is no.1 cabinet in Godalming, Surrey. This has been there for many years.  It's had a add on side box installed last year.  At the moment it has a red workman barrier around it and been like that for several weeks now.
Indeed. FTTC available since 7th October 2010. Perhaps the side box was capacity expansion. Not sure what works would be going on there, though.

I'll try and get some more stats when I'm back.  At the moment I can't get dslstats to work with the technicolour. Connects but doesn't return data.  It did work but stopped for some reason. 
Maybe the shell comand is different to other devices. Perhaps try https://kitz.co.uk/routers/telnet_router.htm. When you've telnet'd into the modem, you should be able to get into the shell using "sh". There are many variations of the "adsl" command which are listed at https://wiki.kitz.co.uk/index.php/Broadcom_CLI, but try something like "adsl info --show" and if the command is invalid try the variants until you get one to work. Let us know how you get on.

I forgot to say  the Billion 8800nl r2 router would lock up and freeze when connected behind the MK4 faceplate in the test socket.   It would be fine using the normal socket.  Interference?   
Nope. Don't see how that is possible. I would, in this scenario, advise you to upgrade to the latest firmware and select for it to restore default settings (in case you have a "dirty" config that is causing issues). http://www.billion.uk.com/esupport/index.php?/Knowledgebase/Article/View/417/119/latest-bipac-8800nl-r2-firmware-252d10 appears to be the latest. If the issues persist, then you may want to create a ticket at Billion's support site.

Back in November Openreach moved me on to another backhaul? As they said it was congested on the one I had after I reported slow downstream.
Backhaul has nothing to do with sync speed. That is the link that carries data to and from exchanges. Perhaps there were some backhaul changes due to congestion.

At a glance, anyway, I would say that the upstream should fall quite well below the Fault Threshold Rate (if this still exists?). Seeing how it has decreased quite a lot over the past 2 months, it could be a fault - possibly with a line card. This may need to be reported once you've gone down every other avenue in case they send out an engineer for a chargable job.

Edit: Fixed typo
« Last Edit: August 12, 2018, 04:34:50 PM by re0 »
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shaun1264

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Re: Slowing upstream
« Reply #5 on: August 12, 2018, 04:17:44 PM »

OK, got the line ready for Plusnet to test (plug into test socket blah blah)  after posting on their forum so they should start testing at some point soon.

Definitely very poor upstream
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re0

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Re: Slowing upstream
« Reply #6 on: August 12, 2018, 04:36:25 PM »

Let us know what results you get back, less any unique identifiers. As it's on the forum, they'll remove any line identifiers, etc. from their post.
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shaun1264

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Re: Slowing upstream
« Reply #7 on: August 12, 2018, 07:50:19 PM »

finally got dslstats working
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re0

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Re: Slowing upstream
« Reply #8 on: August 12, 2018, 08:13:39 PM »

We need to see some more information.

Firstly, in DSLstats go to "Configuration" then "Items to Monitor" and check "SNR per tone" and check "Include with bitloadting". If DSLstats is currently active, the graph will update at the next interval.

What we need to see is graphs for the HLog (you've already included), bitloading and QLN. And we need statistics from under "Telnet Data" including "Connection Stats" and "pbParams". Please paste the text information using code tags as it makes it easier to distinguish.

Tip: You can snapshot graphs using the camera icon which is usually located somewhere under the graph. This will store the screenshot in the location configured as the data store (can be changed in the "Configuration" tab). For the text stats, you can use the clipboard icon to copy to your clipboard for pasting.
« Last Edit: August 12, 2018, 08:15:54 PM by re0 »
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shaun1264

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Re: Slowing upstream
« Reply #9 on: August 12, 2018, 08:33:44 PM »

Telnet:

Code: [Select]
xdslctl info --stats
xdslctl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason:    0
Last initialization procedure status:   0
Max:    Upstream rate = 1155 Kbps, Downstream rate = 56894 Kbps
Bearer: 0, Upstream rate = 1155 Kbps, Downstream rate = 57389 Kbps
Bearer: 1, Upstream rate = 0 Kbps, Downstream rate = 0 Kbps
Link Power State:       L0
Mode:                   VDSL2 Annex B
VDSL2 Profile:          Profile 17a
TPS-TC:                 PTM Mode(0x0)
Trellis:                U:ON /D:ON
Line Status:            No Defect
Training Status:        Showtime
                Down            Up
SNR (dB):        2.6             6.0
Attn(dB):        21.6            0.0
Pwr(dBm):        12.5           -11.6

                        VDSL2 framing
                        Bearer 0
MSGc:           -6              26
B:              227             31
M:              1               1
T:              0               42
R:              10              0
S:              0.1264          0.8620
L:              15068           297
D:              4               1
I:              238             32
N:              238             32
Q:              4               0
V:              0               0
RxQueue:                140             0
TxQueue:                20              0
G.INP Framing:          18              0
G.INP lookback:         20              0
RRC bits:               0               24
                        Bearer 1
MSGc:           122             -6
B:              0               0
M:              2               0
T:              2               0
R:              16              0
S:              8.0000          0.0000
L:              32              0
D:              1               0
I:              32              0
N:              32              0
Q:              0               0
V:              0               0
RxQueue:                0               0
TxQueue:                0               0
G.INP Framing:          0               0
G.INP lookback:         0               0
RRC bits:               0               0

                        Counters
                        Bearer 0
OHF:            0               1811625
OHFErr:         16              7
RS:             516814220               76047493
RSCorr:         402935          0
RSUnCorr:       0               0
                        Bearer 1
OHF:            1020451         0
OHFErr:         17              0
RS:             8163112         0
RSCorr:         266             0
RSUnCorr:       32              0

                        Retransmit Counters
rtx_tx:         10976           0
rtx_c:          5884            0
rtx_uc:         618             0

                        G.INP Counters
LEFTRS:         4               0
minEFTR:        57395           0
errFreeBits:    14341015                0

                        Bearer 0
HEC:            0               0
OCD:            0               0
LCD:            0               0
Total Cells:    1808801299              0
Data Cells:     63805822                0
Drop Cells:     0
Bit Errors:     0               0

                        Bearer 1
HEC:            0               0
OCD:            0               0
LCD:            0               0
Total Cells:    0               0
Data Cells:     0               0
Drop Cells:     0
Bit Errors:     0               0

ES:             5               3
SES:            0               0
UAS:            36              36
AS:             16390

                        Bearer 0
INP:            60.00           0.00
INPRein:        1.00            0.00
delay:          0               0
PER:            0.00            9.08
OR:             0.01            28.17
AgR:            57514.89        1183.37

                        Bearer 1
INP:            2.00            0.00
INPRein:        2.00            0.00
delay:          0               0
PER:            16.06           0.01
OR:             63.75           0.01
AgR:            63.75   0.01

Bitswap:        12701/12892             4/4

Total time = 4 hours 33 min 46 sec
FEC:            402935          0
CRC:            16              7
ES:             5               3
SES:            0               0
UAS:            36              36
LOS:            0               0
LOF:            0               0
LOM:            0               0
Retr:           0
HostInitRetr:   0
FailedRetr:     0
Latest 15 minutes time = 3 min 46 sec
FEC:            6272            0
CRC:            0               0
ES:             0               0
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Retr:           0
HostInitRetr:   0
FailedRetr:     0
Previous 15 minutes time = 15 min 0 sec
FEC:            26832           0
CRC:            0               0
ES:             0               0
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Retr:           N/A
HostInitRetr:   N/A
FailedRetr:     N/A
Latest 1 day time = 4 hours 33 min 46 sec
FEC:            402935          0
CRC:            16              7
ES:             5               3
SES:            0               0
UAS:            36              36
LOS:            0               0
LOF:            0               0
LOM:            0               0
Retr:           0
HostInitRetr:   0
FailedRetr:     0
Previous 1 day time = 0 sec
FEC:            0               0
CRC:            0               0
ES:             0               0
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Retr:           0
HostInitRetr:   0
FailedRetr:     0
Since Link time = 4 hours 33 min 9 sec
FEC:            402935          0
CRC:            16              7
ES:             5               3
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Retr:           0
HostInitRetr:   0
FailedRetr:     0
NTR: mipsCntAtNtr=0 ncoCntAtNtr=0
root@modemtim:~#

Code: [Select]
xdslctl info --pbParams
xdslctl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason:    0
Last initialization procedure status:   0
Max:    Upstream rate = 1155 Kbps, Downstream rate = 56799 Kbps
Bearer: 0, Upstream rate = 1155 Kbps, Downstream rate = 57389 Kbps
Bearer: 1, Upstream rate = 0 Kbps, Downstream rate = 0 Kbps
Discovery Phase (Initial) Band Plan
US: (7,32) (871,1205) (1972,2782)
DS: (33,859) (1216,1961) (2793,3959)
Medley Phase (Final) Band Plan
US: (7,32) (871,948)
DS: (33,859) (1216,1961) (2793,3697)
VDSL Port Details               Upstream                Downstream
Attainable Net Data Rate:         1155 kbps              56799 kbps
Actual Aggregate Tx Power:      -  11.6 dBm                12.5 dBm
====================================================================================
  VDSL Band Status U0 U1 U2 U3 U4 D1 D2 D3
  Line Attenuation(dB): 7.7 36.3 N/A N/A N/A 16.4 44.5 68.1
Signal Attenuation(dB): 7.7 34.6 N/A N/A N/A 18.3 44.1 68.9
        SNR Margin(dB): 5.9 6.1 N/A N/A N/A 2.6 2.5 2.6
         TX Power(dBm): -17.3 -13.1 N/A N/A N/A 8.9 8.1 5.6
        kl0(dBx100):    180     180       N/A     N/A     N/A   1603    1739    1805   
root@modemtim:~#

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re0

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Re: Slowing upstream
« Reply #10 on: August 12, 2018, 09:23:09 PM »

I can see your line is a bit susceptible to noise since ReTX is high (INPRein), at least on downstream. But we'll put that aside for now.

Something is not looking right with that upstream. It's certainly a bit anemic. U1 can sometimes have less bits loaded per tone than U2 (on my line, U2 has a higher SNR than U1). But there is virtually nothing allocated in U1 and U2 is just empty. Based on typical connections, the SNR should be enough to load about 3-5 bits per tone in U2 (at 6 dB SNR) and U1 should also be able to allocate a similar number.

The QLN baselines look quite high for the upstream bands compared to what I am used to. Perhaps if someone could comment whether this is an indication of an issue? It looks a bit suspect to me. But the HLog is a pretty clean slope.

I would wait for a response from Plusnet. Something is definitely amiss here. As long as you have done all the leg work (such as trying different filters, leads and modems), I think there is no reason why this won't be recognised as a fault out of your control.

7 Mbps, as you received before, should be possible quite easily. I would be surprised that if you couldn't get more once this has been resolved.

Keep us posted. But keep an eye on this space as some other members may have something to add.
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burakkucat

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Re: Slowing upstream
« Reply #11 on: August 12, 2018, 10:24:48 PM »

One other configuration adjustment is required within DSLstats.

A G.993.2, Profile 17a, service has a total of 4096 sub-carriers (numbered from 0 to 4095). At present, the plots you have shown us are truncated and we do not see the entire bandwidth. There is a "Change tone range" button below any of the "per tone" plots. Left-click on it and select the "Custom" option. Then adjust the slider so that all 4096 sub-carriers are visible in the plots.
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shaun1264

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Re: Slowing upstream
« Reply #12 on: August 13, 2018, 06:25:53 PM »

Code: [Select]
GEA Test Detail
Circuit ID NA Service ID BBEUxxxxxxxx
 
 
Test Outcome Pass
Test Outcome Code GTC_FTTC_SERVICE_0000
Description GEA service test completed and no fault found .
Main Fault Location OK
Sync Status In Sync
Downstream Speed 54.9 Mbps
Upstream Speed 1.2 Mbps
Appointment Required N
Fault Report Advised N
NTE Power Status PowerOn
Voice Line Test Result Pass
Bridge Tap Not Detected
Radio Frequency Ingress Not Detected
Repetitive Electrical Impulse Noise Not Detected
Cross Talk Detected
Estimated Line Length In Metres 768.9
Upstream Rate Assessment Low
Downstream Rate Assessment Very Good
Interference Pattern Regular Interference Observed Daily
Service Impact No Impact Observed
Interference Duration Longest Occurrence From 17:00 to 22:00
Interference Location Customer Premise
Interference Observed In Days 14
Home Wiring Problem Not Detected
Downstream Policing Discard Rate 0.0
Customer Traffic Level Upstream and Downstream Traffic Detected
Technology VDSL
Profile Name 0.128M-80M Downstream 4dB, Retransmission High - 0.128M-20M Upstream, Retransmission Low
Time Stamp 2018-07-31T12:15:00
Parameters MIN MAX AVG
Down Stream Line Rate 44.8 Mbps 57.3 Mbps 49.0 Mbps
Up Stream Line Rate 1.1 Mbps 3.9 Mbps 3.0 Mbps
Up Time 621.0 Sec 900.0 Sec 899.0 Sec
Retrains 0.0 1.0 0.0
Current and Last 15 Minute Bin Performance
Parameters Last Traffic Count(Upto 15 mins) Current Traffic Count(Upto 15 mins)
Start Time Stamp 2018-08-13T10:40:33Z 2018-08-13T10:55:33Z
Ingress Code Violation 0 0
Egress Code Violation 0 0
Errored Seconds 0 0
Severely Errored Seconds 0 0
Unavailable Seconds 0 0



FTTC
 
Product status: Enabled
Product RAG: Green
Reason code: G - FTTC is already enabled on this line
CAB #: 1
Speed (Clean) : 53300 - 38100
Upstream: 9900 - 6500
 
Speed (Impacted) : 41300 - 25000
Upstream: 8900 - 4800

So Plusnet agrees that the upstream is slow and would like to send an Openreach engineer out to investigate.

Ive attached a new QLN graph so all sub carriers are shown.   Thanks

[Moderator edited to obfusticate the BBEU ID.]
« Last Edit: August 13, 2018, 07:42:02 PM by burakkucat »
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re0

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  • Posts: 840
Re: Slowing upstream
« Reply #13 on: August 13, 2018, 06:47:42 PM »

Yeah, the upstream is a lot lower than I would anticipate. The downstream is actually pretty good to be honest.

Good that they will send an engineer out. As long as you have as much as you can on your end, they won't charge you. But I doubt that they won't find a fault.
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ISP: Gigaclear - Hyperfast 900 (up to 940 Mbps symmetrical)

shaun1264

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  • Posts: 39
Re: Slowing upstream
« Reply #14 on: August 20, 2018, 12:54:55 PM »

Time to update after Openreach attended to fix fault. 

Before engineer came out the line did a resync today after 7 days of continuous connection.  Snr went back to 6dB.  I guess something was reset.

Engineer was here from 8am to 12:30pm to rectify fault.  He seemed very thorough which included going the pole and several visits to the local cabinet to fix the fault.  With oscillator plugged in he was at the cabinet for about 30 mins on his last visit. 

Back to normal now.   7mbps upload and the Power (dbm) figure up at 5.6dbm. FEC errors really low now too on downstream.   I didnt really ask what the fault was but he did change the pairs and several visits to cabinet.
« Last Edit: August 20, 2018, 12:57:40 PM by shaun1264 »
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