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Author Topic: Advice Needed - Health Check  (Read 8394 times)

CrazyTeeka

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Advice Needed - Health Check
« on: May 08, 2017, 12:34:02 AM »

What is the best way to health check your broadband line?
What tools can you use?
How can you tell a fault from a non-fault?
Can Broadband Boost or SFI2 improve things even if there is no clear fault?
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burakkucat

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Re: Advice Needed - Health Check
« Reply #1 on: May 08, 2017, 12:45:52 AM »

Four questions, all very difficult to answer!  ::)

Some suggestions, in the same numerical order --
  • Assume nothing and consider it as something completely new to yourself.
  • A DMM, a TDR, a Spectrum Analyser.
  • By experience.
  • Yes. And no. And maybe. Or possibly.
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CrazyTeeka

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Re: Advice Needed - Health Check
« Reply #2 on: May 08, 2017, 12:53:13 AM »

Thanks for the reply. If I share the information I have maybe it can help.

Test dc00f664-eaf2-4788-93e6-f72489ca854d DiagnosticCode = GTC_FTTC_SERVICE_1625, TestDescription = Impairment in copper joint detected most likely in local network. Please continue to submit a trouble report, ServiceTestID = 3147415, OpenreachReferenceID = or_nga_rdl10432app02:352886053, TestCompleted = true, DateTestRequested = 2017-05-07T12:56:24.09, DateTestCompleted = 2017-05-07T12:57:28.757, TestOutcome = Fail, MainFaultLocation = LN, AppointmentRequired = N, FaultReportAdvised = Y, ServiceLevel = 2, EthernetTraffic = N, DownstreamSpeedMBPS = 0, UpstreamSpeedMBPS = 0, DateTestStarted = 2017-05-07T12:56:31.157, DateTestStopped = 2017-05-07T12:57:21.1, RadioFrequencyIngress = Not Detected, BridgeTap = Not Detected, RepetitiveElectricalImpulseNoise = Not Detected, VoiceLineTestResult = Pass, CrossTalk = Not Detected, Client = TTR Service Centre

adsl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason:    4
Last initialization procedure status:   0
Max:    Upstream rate = 16295 Kbps, Downstream rate = 60264 Kbps
Bearer: 0, Upstream rate = 16233 Kbps, Downstream rate = 53488 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):        4.8             6.1
Attn(dB):        21.3            0.0
Pwr(dBm):        6.9             6.9

                        VDSL2 framing
                        Bearer 0
MSGc:           18              14
B:              51              238
M:              1               1
T:              64              59
R:              12              16
S:              0.0309          0.4686
L:              16552           4353
D:              1047            1
I:              64              255
N:              64              255

                        Counters
                        Bearer 0
OHF:            88621323                1214033
OHFErr:         512             31
RS:             1212094690              298321
RSCorr:         2548591         239
RSUnCorr:       24491           0

                        Bearer 0
HEC:            5751            0
OCD:            3               0
LCD:            3               0
Total Cells:    937050035               0
Data Cells:     375905939               0
Drop Cells:     0
Bit Errors:     0               0

ES:             266             37
SES:            19              0
UAS:            383             364
AS:             176161

                        Bearer 0
INP:            3.00            0.00
INPRein:        0.00            0.00
delay:          8               0
PER:            1.98            6.93
OR:             96.60           23.05
AgR:            53584.68        16255.98

Bitswap:        54048/54077             202/207

Total time = 3 days 9 hours 52 min 56 sec
FEC:            4684133         363
CRC:            10035           46
ES:             266             37
SES:            19              0
UAS:            383             364
LOS:            0               0
LOF:            10              0
LOM:            12              0
Latest 15 minutes time = 7 min 56 sec
FEC:            9947            2
CRC:            19              0
ES:             1               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:            26224           0
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 = 9 hours 52 min 56 sec
FEC:            840570          39
CRC:            117             1
ES:             36              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:            1204458         91
CRC:            269             9
ES:             61              9
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Since Link time = 2 days 56 min 1 sec
FEC:            2548591         239
CRC:            512             31
ES:             135             22
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
NTR: mipsCntAtNtr=0 ncoCntAtNtr=0
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burakkucat

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Re: Advice Needed - Health Check
« Reply #3 on: May 08, 2017, 12:59:24 AM »

Quote
TestDescription = Impairment in copper joint detected most likely in local network.

That defect would be easily found using the TDR functionality of a JDSU HST-3000c or an Exfo AXS-200/635 -- the standard issue HHTs provided to Openreach technicians.
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CrazyTeeka

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Re: Advice Needed - Health Check
« Reply #4 on: May 08, 2017, 01:23:35 AM »

What does this reveal...

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Black Sheep

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Re: Advice Needed - Health Check
« Reply #5 on: May 08, 2017, 09:00:24 AM »

It reveals a potential high-resistance fault (HR).

The dotted line running north to south is the 'measuring cursor', where it is positioned in this screen-cap it shows as being 43.1mtrs.
However, the potential HR is slightly to the right of this (shown as a slight 'peak'), and the cursor would need to be positioned at the start of the 'peak' climbing edge ....... or if you prefer, at the bottom of the 'U'. The screen when on 'XShort' runs from 0-108mtrs, so the HR will in fact probably be around 50mtrs away, from the point at which it is being measured ??. 

The only other thing this could be is a potential 'Cable poundage change'. Again, if we look at the gain setting in the screen-cap, it shows as being at '8'. That means the operator of the hand-held tester has manually increased the gain themselves, as when at 'XShort' ...... it will be auto-set to a gain of just '2'.

Increasing the gain also increases the chances of seeing something that 'Isn't there' .... if you see what I mean ?? ;) :)
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CrazyTeeka

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Re: Advice Needed - Health Check
« Reply #6 on: May 08, 2017, 01:27:10 PM »

Can the HST3000's VDSL modem in VTU-C mode be used to safely test the DSL circuits in any modem router?
If you get any errors while performing this test and you know the cable is good, does that mean modem router is faulty?
Likewise if you get zero errors, does that mean the modem router is good?
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Black Sheep

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Re: Advice Needed - Health Check
« Reply #7 on: May 08, 2017, 04:29:43 PM »

Can the HST3000's VDSL modem in VTU-C mode be used to safely test the DSL circuits in any modem router?
If you get any errors while performing this test and you know the cable is good, does that mean modem router is faulty?
Likewise if you get zero errors, does that mean the modem router is good?

Not 100% certain what you mean ...... but the HST3000 has two functions that we tend to use when faulting BB circuits.

1) An xDSL test ..... this basically logs-on to the DSLAM (ADSL or VDSL) and passes data between the two points.
2) A DSL Close-out test ...... this basically logs onto the ISP's server (may be the wrong terminology, but that's how I word it). So it passes data between a greater distance and also ensures the ISP can see we as OR have 'logged on' to their circuit and performed a 5-minute test. A mandatory action on BB faulting.

If errors are witnessed, we obviously use test 1) to determine where in the big scheme of things the fault lies.
Zero errors does not automatically ensure you have a fault-free circuit, (there are other scenarios that can occur that will introduce errors), it just indicates the circuit is performing OK at that particular point-in-time.

The only way we can 'test' the EU's router is to ring the ISP and have them perform comparison test between our kit and theirs.
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CrazyTeeka

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Re: Advice Needed - Health Check
« Reply #8 on: May 08, 2017, 04:49:24 PM »

Thanks for sharing.  :)

There is a VDSL Modem on the HST3000, that can act as a Modem (VTU-R) or a DSLAM (VTU-C).

What I'm pondering is if this has any usefulness testing end user modems/routers/equipment.
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Black Sheep

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Re: Advice Needed - Health Check
« Reply #9 on: May 08, 2017, 05:01:18 PM »

I can't comment for certain, but think only two hand-held testers of the same type can be used in VTU-C mode ..... ie: 2 HST3000's ??? I'm sure others may be able to comment further to clarify. :)

It's not something I've ever done, or been asked to do.
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CrazyTeeka

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Re: Advice Needed - Health Check
« Reply #10 on: May 08, 2017, 05:22:30 PM »

Out of interest mainly, would a PQ test to Sin349 spec pickup any issues with D-Side/E-Side Copper and LiC/Other systems in exchange?
Or does it just focus on the Copper cable?
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Black Sheep

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Re: Advice Needed - Health Check
« Reply #11 on: May 08, 2017, 05:40:26 PM »

Out of interest mainly, would a PQ test to Sin349 spec pickup any issues with D-Side/E-Side Copper and LiC/Other systems in exchange?
Or does it just focus on the Copper cable?

A PQT won't pick up faulty Exchange Equipment, as the test-heads the come into play after this ......... but it will pick up most E/D side copper impairments.
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CrazyTeeka

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Re: Advice Needed - Health Check
« Reply #12 on: May 08, 2017, 06:02:50 PM »

How would an engineer know things are OK in the exchange?
Or do they just assume it is?  ;)
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Black Sheep

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Re: Advice Needed - Health Check
« Reply #13 on: May 08, 2017, 06:30:50 PM »

How would an engineer know things are OK in the exchange?
Or do they just assume it is?  ;)

Faulty Exchange Equipment is usually picked up by our other test systems (Eclipse, Fast Test, CIDT).
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CrazyTeeka

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Re: Advice Needed - Health Check
« Reply #14 on: May 08, 2017, 06:52:13 PM »

Thanks for all this advice.  :)
Just for my notes, how much does Broadband Boost cost, all I found when looking was TOA?
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