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2860 spurious retranmission errors FTTC VDSL

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29 Sep 2017 17:26 #13 by stoogie
Replied by stoogie on topic Re: 2860 spurious retranmission errors FTTC VDSL
So, I am seeing NE CRC errors, over 1000 of them in the last two hours... when the engineer had the test tool on, there were none.

Is this indicative of the problem mentioned?

Martin

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  • adrianh54
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29 Sep 2017 18:50 #14 by adrianh54
Replied by adrianh54 on topic Re: 2860 spurious retranmission errors FTTC VDSL

stoogie wrote: So, I am seeing NE CRC errors, over 1000 of them in the last two hours... when the engineer had the test tool on, there were none.

Is this indicative of the problem mentioned?

Martin



That would suggest your line is being affected by noise/interference.

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29 Sep 2017 23:28 #15 by stoogie
Replied by stoogie on topic Re: 2860 spurious retranmission errors FTTC VDSL
Interesting...

The CRC rate continues to increase, though the engineer said the line was clear, and he had it running for a while... (no CRC's when viewed on the test kit...)

Interestingly I have a faster rate than attainable downstream rate!

vdsl status

ATU-R Info (hw: annex A, f/w: annex A/B/C)

Running Mode : 17A State : SHOWTIME
DS Actual Rate : 21269000 bps US Actual Rate : 4688000 bps
DS Attainable Rate : 21144896 bps US Attainable Rate : 4688000 bps
DS Path Mode
Code:
: Fast US Path Mode : Fast
DS Interleave Depth : 1 US Interleave Depth : 1
NE Current Attenuation : 29 dB Cur SNR Margin : 4 dB
DS actual PSD : 7. 2 dB US actual PSD : 10. 1 dB
NE CRC Count : 1691 FE CRC Count : 105005
NE ES Count : 243 FE ES Count : 28441
Xdsl Reset Times : 0 Xdsl Link Times : 1
ITU Version[0] : b5004946 ITU Version[1] : 544e0000
VDSL Firmware Version : 05-07-06-0D-01-07 [with Vectoring support]
Power Management Mode : DSL_G997_PMS_L0
Test Mode : DISABLE
ATU-C Info

Far Current Attenuation : 36 dB Far SNR Margin : 6 dB
CO ITU Version[0] : b5004244 CO ITU Version[1] : 434da48c
DSLAM CHIPSET VENDOR : < BDCM >

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01 Oct 2017 01:54 #16 by stoogie
Replied by stoogie on topic Re: 2860 spurious retranmission errors FTTC VDSL
And now the slide in performance begins... first disconnect this evening... speed comes back slower...

vdsl status

ATU-R Info (hw: annex A, f/w: annex A/B/C)

Running Mode : 17A State : SHOWTIME
DS Actual Rate : 20989000 bps US Actual Rate : 4674000 bps
DS Attainable Rate : 21340608 bps US Attainable Rate : 4674000 bps
DS Path Mode : Fast US Path Mode : Fast
DS Interleave Depth : 1 US Interleave Depth : 1
NE Current Attenuation : 29 dB Cur SNR Margin : 4 dB
DS actual PSD : 7. 2 dB US actual PSD : 10. 0 dB
NE CRC Count : 342 FE CRC Count : 105167
NE ES Count : 56 FE ES Count : 28495
Xdsl Reset Times : 0 Xdsl Link Times : 2
ITU Version[0] : 00000000 ITU Version[1] : 00000000
VDSL Firmware Version : 05-07-06-0D-01-07 [with Vectoring support]
Power Management Mode : DSL_G997_PMS_L0
Test Mode : DISABLE
ATU-C Info

Far Current Attenuation : 35 dB Far SNR Margin : 6 dB
CO ITU Version[0] : b5004244 CO ITU Version[1] : 434da48c
DSLAM CHIPSET VENDOR : < BDCM >

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01 Oct 2017 06:19 #17 by adrianh54
Replied by adrianh54 on topic Re: 2860 spurious retranmission errors FTTC VDSL

stoogie wrote: And now the slide in performance begins... first disconnect this evening... speed comes back slower...

vdsl status

ATU-R Info (hw: annex A, f/w: annex A/B/C)

Running Mode : 17A State : SHOWTIME
DS Actual Rate : 20989000 bps US Actual Rate : 4674000 bps
DS Attainable Rate : 21340608 bps US Attainable Rate : 4674000 bps
DS Path Mode : Fast US Path Mode : Fast
DS Interleave Depth : 1 US Interleave Depth : 1
NE Current Attenuation : 29 dB Cur SNR Margin : 4 dB
DS actual PSD : 7. 2 dB US actual PSD : 10. 0 dB
NE CRC Count : 342 FE CRC Count : 105167
NE ES Count : 56 FE ES Count : 28495
Xdsl Reset Times : 0 Xdsl Link Times : 2
ITU Version[0] : 00000000 ITU Version[1] : 00000000
VDSL Firmware Version : 05-07-06-0D-01-07 [with Vectoring support]
Power Management Mode : DSL_G997_PMS_L0
Test Mode : DISABLE
ATU-C Info

Far Current Attenuation : 35 dB Far SNR Margin : 6 dB
CO ITU Version[0] : b5004244 CO ITU Version[1] : 434da48c
DSLAM CHIPSET VENDOR : < BDCM >




Interesting that your SNR doesn't change with these drops.

You could try the Vigor 2860 Series Non-Vector Firmware 3.8.4.6 firmware , see if that helps.

I run a Vigor 130 modem , I find the "BT" firmware to be unstable. My ISP is UNO, We are provided with a superb user console which details our connection stats, usage, sessions etc.
Using the BT firmware I see sessions drop many times per day with the annotation " Port Error" . If I use the alternative firmware now listed by Draytek I see no session drops or Port errors at all. My modem has been connected for 10 days . As you note, the attainable speed is shown lower than actual speed. Again , as soon as I changed to the non BT firmware this anomaly stopped.

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  • idmanager
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01 Oct 2017 09:52 #18 by idmanager
Replied by idmanager on topic Re: 2860 spurious retranmission errors FTTC VDSL
i have my connection sorted now, it was a configuration error in the exchange, just wondering if it got anything to do with BT infinity 1 now getting 80/20 speed for free if there line can cope with it .

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