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Topic # 240407 6-Sep-2018 12:04
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Situation -

 

Rural VDSL2 connection, ~370m from exchange building to demarc (cable path). Was very stable and reliable pre-vectoring so main benefit in this case would be speed.

 

CPE = Mikrotik HAP ac and Metanoia MT-V5311

 

Before:

 

 

After:

 





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Meow
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  Reply # 2084975 6-Sep-2018 12:11
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I noticed from my Parents connection that it will go through a full DLM cycle again once Vectoring is turned on. It could well improve again. They went from 120/30Mbit sync to 150/30Mbit in a few days.

 

Nice bump in speed however!







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  Reply # 2084978 6-Sep-2018 12:15
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michaelmurfy:

 

I noticed from my Parents connection that it will go through a full DLM cycle again once Vectoring is turned on. It could well improve again. They went from 120/30Mbit sync to 150/30Mbit in a few days.

 

 

Thanks for the headsup Michael Murphy. I had wondered about that exact matter :-)

 

Are they practically living on top of the ISAM?





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  Reply # 2084979 6-Sep-2018 12:16
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michaelmurfy:

 

I noticed from my Parents connection that it will go through a full DLM cycle again once Vectoring is turned on. It could well improve again. They went from 120/30Mbit sync to 150/30Mbit in a few days.

 

Nice bump in speed however!

 

 

uh, 150? that doesn't seem right... the cards are only meant to do 150 aggregated which is why the upstream rates were dropped to 30.





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  Reply # 2084982 6-Sep-2018 12:22
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michaelmurfy:

 

I noticed from my Parents connection that it will go through a full DLM cycle again once Vectoring is turned on. It could well improve again. They went from 120/30Mbit sync to 150/30Mbit in a few days.

 

Nice bump in speed however!

 

 

@michaelmurfy can you PM me the address of the connection so I can have a look? I promise to not reduce it :)


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  Reply # 2084986 6-Sep-2018 12:31
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BMarquis:

 

@michaelmurfy can you PM me the address of the connection so I can have a look? I promise to not reduce it :)

 

Done. Also darn! Looks like it went back down again since a long powercut happened the other week (have not checked it in a while).

 

Down Stream : 124313Kbps / Up Stream : 29999Kbps

 

Still, way more than my parents need.





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  Reply # 2084994 6-Sep-2018 12:41
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michaelmurfy:

 

BMarquis:

 

michaelmurfy can you PM me the address of the connection so I can have a look? I promise to not reduce it :)

 

Done. Also darn! Looks like it went back down again since a long powercut happened the other week (have not checked it in a while).

 

Down Stream : 124313Kbps / Up Stream : 29999Kbps

 

Still, way more than my parents need.

 

 

That's looking more on par ;)

 

 

 

 





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  Reply # 2084995 6-Sep-2018 12:43
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Results with my Cisco 887VA. This indicates it does support vectoring though note the modem firmware and IOS I used.

 

Sorry, no before image but previous speed test results were 59Mbps at best.

 

 

Output of "show controllers vdsl 0"

 

Controller VDSL 0 is UP

 

Daemon Status: Up

XTU-R (DS) XTU-C (US)
Chip Vendor ID: 'BDCM' 'BDCM'
Chip Vendor Specific: 0x0000 0xB1AD
Chip Vendor Country: 0xB500 0xB500
Modem Vendor ID: 'CSCO' ' '
Modem Vendor Specific: 0x4602 0x0000
Modem Vendor Country: 0xB500 0x0000
Serial Number Near: [redacted] 887VA-K9 15.7(3)M1
Serial Number Far: AA1801FS3LP-31
Modem Version Near: 15.7(3)M1
Modem Version Far: 0xb1ad

 

Modem Status: TC Sync (Showtime!)

 

DSL Config Mode: AUTO
Trained Mode: G.993.2 (VDSL2) Profile 17a
TC Mode: PTM
Selftest Result: 0x00
DELT configuration: disabled
DELT state: not running

 

Full inits: 1
Failed full inits: 0
Short inits: 0
Failed short inits: 1

 

Firmware Source File Name
-------- ------ ----------
VDSL user config flash:VA_B_38V_d24m.bin

 

Modem FW Version: 170321_1253-4.02L.03.B2pvC038v.d24m
Modem PHY Version: B2pvC038v.d24m
Trellis: ON ON
SRA: disabled disabled
SRA count: 0 0
Bit swap: enabled enabled
Bit swap count: 21 12
Line Attenuation: 21.2 dB 0.0 dB
Signal Attenuation: 0.0 dB 0.0 dB
Noise Margin: 6.6 dB 8.1 dB
Attainable Rate: 89016 kbits/s 33375 kbits/s
Actual Power: 14.3 dBm 7.0 dBm
Per Band Status: D1 D2 D3 U0 U1 U2 U3
Line Attenuation(dB): 16.0 36.8 41.4 4.8 24.4 32.0 N/A
Signal Attenuation(dB): 15.9 37.0 41.5 4.8 23.3 31.2 N/A
Noise Margin(dB): 7.1 6.4 6.4 7.9 8.2 8.1 N/A
Total FECC: 0 0
Total ES: 0 0
Total SES: 0 0
Total LOSS: 0 0
Total UAS: 79 79
Total LPRS: 0 0
Total LOFS: 0 0
Total LOLS: 0 0


DS Channel1 DS Channel0 US Channel1 US Channel0
Speed (kbps): 0 87508 0 30000
SRA Previous Speed: 0 0 0 0
Previous Speed: 0 0 0 0
Reed-Solomon EC: 0 0 0 0
CRC Errors: 0 0 0 0
Header Errors: 0 0 0 0
Interleave (ms): 3.00 0.00 0.00 0.00
Actual INP: 4.00 46.00 4.00 43.00

Training Log : Stopped
Training Log Filename : flash:vdsllog.bin





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  Reply # 2085080 6-Sep-2018 14:50
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More like 800 metres.


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  Reply # 2085138 6-Sep-2018 16:51
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MichaelNZ:

 

SRA: disabled disabled

 

 

 

 

Switch SRA on - it's important so that the sync rate can be modified immediately after sync.
If you are lucky, you might notice the sync rate rise in the minute or so after successful sync with SRA on.

 

 


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  Reply # 2085140 6-Sep-2018 16:54
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BMarquis:

 

MichaelNZ:

 

SRA: disabled disabled

 

 

Switch SRA on - it's important so that the sync rate can be modified immediately after sync.
If you are lucky, you might notice the sync rate rise in the minute or so after successful sync with SRA on.

 

 

This is consistently a 2-3mbit rise on my link, it's great.

 

Also a pain at the same time though as i have to cycle PPP in order to update QOS profiles

 

 

 

 

 

Do you have numbers that can be shared on how much of the vectored lines have SRA active on the modem end?

 

I'm quite curious on that one...





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  Reply # 2085163 6-Sep-2018 18:10
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Controller VDSL 0 is UP

 

Daemon Status: Up

 

XTU-R (DS) XTU-C (US)
Chip Vendor ID: 'BDCM' 'BDCM'
Chip Vendor Specific: 0x0000 0xB1AD
Chip Vendor Country: 0xB500 0xB500
Modem Vendor ID: 'CSCO' ' '
Modem Vendor Specific: 0x4602 0x0000
Modem Vendor Country: 0xB500 0x0000
Serial Number Near: [redacted] 887VA-K9 15.7(3)M1
Serial Number Far: AA1801FS3LP-31
Modem Version Near: 15.7(3)M1
Modem Version Far: 0xb1ad

 

Modem Status: TC Sync (Showtime!)

 

DSL Config Mode: AUTO
Trained Mode: G.993.2 (VDSL2) Profile 17a
TC Mode: PTM
Selftest Result: 0x00
DELT configuration: disabled
DELT state: not running

 

Full inits: 3
Failed full inits: 0
Short inits: 0
Failed short inits: 2

 

Firmware Source File Name
-------- ------ ----------
VDSL user config flash:VA_B_38V_d24m.bin

 

Modem FW Version: 170321_1253-4.02L.03.B2pvC038v.d24m
Modem PHY Version: B2pvC038v.d24m
Trellis: ON ON
SRA: enabled enabled
SRA count: 2 0
Bit swap: enabled enabled
Bit swap count: 4 2
Line Attenuation: 21.2 dB 0.0 dB
Signal Attenuation: 0.0 dB 0.0 dB
Noise Margin: 6.6 dB 8.2 dB
Attainable Rate: 88919 kbits/s 33352 kbits/s
Actual Power: 14.3 dBm 7.0 dBm
Per Band Status: D1 D2 D3 U0 U1 U2 U3
Line Attenuation(dB): 16.0 36.9 41.5 4.8 24.4 32.0 N/A
Signal Attenuation(dB): 15.9 37.0 41.4 4.8 23.2 31.2 N/A
Noise Margin(dB): 6.9 6.5 6.4 8.6 8.2 8.2 N/A
Total FECC: 45 3
Total ES: 0 0
Total SES: 0 0
Total LOSS: 0 0
Total UAS: 296 296
Total LPRS: 0 0
Total LOFS: 0 0
Total LOLS: 0 0


DS Channel1 DS Channel0 US Channel1 US Channel0
Speed (kbps): 0 87359 0 30000
SRA Previous Speed: 0 87439 0 30000
Previous Speed: 0 87439 0 30000
Reed-Solomon EC: 0 0 0 0
CRC Errors: 0 0 0 0
Header Errors: 0 0 0 0
Interleave (ms): 3.00 0.00 0.00 0.00
Actual INP: 4.00 46.00 4.00 43.00

Training Log : Stopped
Training Log Filename : flash:vdsllog.bin

 





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  Reply # 2089193 12-Sep-2018 12:11
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michaelmurfy:

 

... Down Stream : 124313Kbps / Up Stream : 29999Kbps

 

 

Vectoring was not enabled on our cabinet until last week and our sync rate is identical.

 

However, I'm curious to know if other VDSL2 users have experienced a drop in download speed after vectoring activation?

 

I accept the fact that upload is now pegged at 30 Mbps but I did expect to see an increase in our download given the consistent stable high sync rates we get on our connection...

 

Before Vectoring: Modem Sync 106/35 Mbps -- Speed Tests 92/33 Mbps (Ping 13) -- Download Loss: 14 Mbps drop.
After Vectoring:   Modem Sync 124/30 Mbps -- Speed Tests 80/27 Mbps (Ping 13) -- Download Loss: 44 Mbps drop ??

 

I'm using a bridged Draytek DV130 and flashed the firmware from 3.8.2_m4 to 3.8.3_m8 last night with no differences noted to either sync rates or speed tests.

 

3-Sep-2018 - Before Vectoring
-----------
ActualRate: 106729/35587 Kbps
Attainable:  107780/35587 Kbps
Path Mode: Interleave/Fast
Interleave: 379/11
SNR Margin: 5/6 dB
Attenuation: 12/13 dB
CRC: 1048/4480
FECS: 21774963/3886270s
ES: 183/2730s

 

5-Sep-2018 - After Vectoring
-----------
ActualRate: 124313/29999 Kbps
Attainable:  136013/34844 Kbps
Path Mode: Fast/Fast
Interleave: 1/1
SNR Margin: 9/8 dB
Attenuation: 12/13 dB
CRC: 0/4544
FECS: 0/0s
ES: 0/2778s

 

I also note from the Draytek Aust & NZ site that Modem_8 is again the recommended firmware for G.Vectoring...

 

'Annex A Model: VDSL2 579f17 & ADSL 573f01 (G. Vectoring)
Recommended for Australia & New Zealand users'

 

Any comments on Modem_8 vs Modem_4 from Draytek owners because we were using _m4 previously as the recommended option?

 

Yes, I know that we can't complain about sync and speed rates we get but I am still curious why the actual speed results are less than expected.


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  Reply # 2089246 12-Sep-2018 13:16
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@datahawk try dropping and reestablishing your PPP session to see if it comes up.

 

I'd suspect the limit is on providers end, many don't handle SRA very well at this stage so you could be pegging at sync rate (it is the first time it's been used afterall)

 

80 to 124 is a massive climb for it to be SRA related though..

 

 

 

@chorusnz have been sneeky with this lot, i didnt see lists for when the flicked the switch (or i totally missed them)

 

 

 

 

 

Your pegging out the vectored line now though! impressive at 12dB!





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  Reply # 2089249 12-Sep-2018 13:20
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hio77:

 

.... try dropping and reestablishing your PPP session to see if it comes up.

 

 

Oh, a good tip that never even crossed my mind.

 

I'll try that tonight when network traffic reduces - Thanks.


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  Reply # 2089463 12-Sep-2018 18:31
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I just did a full power down and restart of the Nighthawk R7000 router to reconnect the PPP link but all actual speed tests are still maxing out at around 80/28 Mbps on a full 124/30 Mbps modem sync. (Actuals were returning 92/33 before our vectoring upgrade - Go figure)

 

I'm with Spark.

 

Anyone else such as @michaelmurfy able to give me some idea of actual speed tests that (their parents) are getting on top end modem sync rates?

 

Cheers.


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