VDSL2 speed boost?

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MichaelNZ

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#195564 24-Apr-2016 17:39

I got a speed boost a few months ago from around 30Mbps to mid 40's. This was in connection with well publicised band plan changes. Now I'm suddenly getting almost 52Mbps and I have no explanation. Does anyone know why?

I'm several hundred metres from the exchange in a rural "dot on the map" location so very happy :-) Thanks Chorus.

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PeterReader

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#1541259 24-Apr-2016 17:39

Hello... Our robot found some keywords in your post, so here is an automated reply with some important things to note regarding broadband speeds.

If you are posting regarding DSL speeds please check that

you have reset your modem and router
your PC (or other PCs in your LAN) is not downloading large files when you are testing - you are not being throttled by your ISP due to going over the monthly cap
your tests are always done on an ethernet connection to the router - do not use wireless for testing
you read this topic and follow the instructions there.

Make sure you provide information for other users to help you. If you have not already done it, please EDIT your post and add this now:

Your ISP and plan
Type of connection (ADSL, ADSL2, VDSL)
Your modem DSL stats (do not worry about posting Speedtest, we need sync rate, attenuation and noise margin)
Your general location (or street)
If you are rural or urban
If you know your connection is to an exchange, cabinet or conklin
If your connection is to a ULL or wholesale service
If you have done an isolation test as per the link above

Most of the problems with speed are likely to be related to internal wiring issues. Read this discussion to find out more about this. Your ISP is not intentionally slowing you down today (unless you are on a managed plan). Also if this is the school holidays it's likely you will notice slower than usual speed due to more users online.

A master splitter is required for VDSL2 and in most cases will improve speeds on DSL connections. Regular disconnections can be a monitored alarm or a set top box trying to connect. If there's an alarm connected to your line even if you don't have an alarm contract it may still try to connect so it's worth checking.

I recommend you read these two blog posts:

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sbiddle

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#1541272 24-Apr-2016 17:41

DLM (which is discussed in literally hundreds of other threads on here about VDSL2)

MichaelNZ

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#1541276 24-Apr-2016 17:46

sbiddle:

DLM (which is discussed in literally hundreds of other threads on here about VDSL2)

That's what the timing would suggest but I thought there may have been another explanation due to how stable it has been for the last few months. In effect I was wondering if Chorus had implemented any other tweaks lately.

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BarTender

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#1541304 24-Apr-2016 18:54

MichaelNZ:
sbiddle:

DLM (which is discussed in literally hundreds of other threads on here about VDSL2)

That's what the timing would suggest but I thought there may have been another explanation due to how stable it has been for the last few months. In effect I was wondering if Chorus had implemented any other tweaks lately.

Chorus haven't made any significant changes in a number of months. So it's DLM doing the job it was designed to do.

MichaelNZ

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#1541306 24-Apr-2016 18:56

BarTender:
Chorus haven't made any significant changes in a number of months. So it's DLM doing the job it was designed to do.

Thanks for that.

Feel free to close this thread sbiddle or other Admin.

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hio77

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#1541308 24-Apr-2016 18:57

a jump of 10mbit there, i would put down to a few things.

You just had a powercut, or some form of whole area outage and resynced while noise was low.

You have moved from a 12dB to an 9dB profile as DLM has decided your line is stable for it.

You have moved to 17a on a borderline 17a line (considering you do say your only a few hundred meters away this would be my pick.)

VDSL being a copper product can always be changing, enjoy the speed boost and hope it doesnt drop back!

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MichaelNZ

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#1541313 24-Apr-2016 19:00

hio77:

You have moved to 17a on a borderline 17a line (considering you do say your only a few hundred meters away this would be my pick.)

It's on 8B.

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MichaelNZ

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#1542047 26-Apr-2016 11:16

My upload speed has barely changed from around 8Mbps. What could be the reason for this?

router>show controllers VdSL 0
Controller VDSL 0 is UP

Daemon Status: Up

XTU-R (DS) XTU-C (US)
Chip Vendor ID: 'BDCM' 'IKNS'
Chip Vendor Specific: 0x0000 0x0001
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 15.3(3)M3
Serial Number Far: ^A
Modem Version Near: 15.3(3)M3
Modem Version Far: 0x0001

Modem Status: TC Sync (Showtime!)
DSL Config Mode: AUTO
Trained Mode: G.993.2 (VDSL2) Profile 8b
TC Mode: PTM
Selftest Result: 0x00
DELT configuration: disabled
DELT state: not running
Trellis: ON ON
SRA: disabled disabled
SRA count: 0 0
Bit swap: enabled enabled
Bit swap count: 0 0
Line Attenuation: 0.0 dB 0.0 dB
Signal Attenuation: 0.0 dB 0.0 dB
Noise Margin: 8.9 dB 9.1 dB
Attainable Rate: 55692 kbits/s 8392 kbits/s
Actual Power: 15.3 dBm - 4.7 dBm
Per Band Status: D1 D2 D3 U0 U1 U2 U3
Line Attenuation(dB): 16.1 37.2 N/A 5.0 27.2 N/A N/A
Signal Attenuation(dB): 16.1 37.2 N/A 5.0 26.8 N/A N/A
Noise Margin(dB): 9.1 8.8 N/A 10.2 9.1 N/A N/A
Total FECC: 0 31454
Total ES: 130580 4456
Total SES: 56 3
Total LOSS: 10 0
Total UAS: 196 196
Total LPRS: 0 0
Total LOFS: 10 0
Total LOLS: 0 0

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

Firmware Source File Name (version)
-------- ------ -------------------
VDSL embedded VDSL_LINUX_DEV_01212008 (1)

Modem FW Version: 130205_1433-4.02L.03.A2pv6C035j.d23j
Modem PHY Version: A2pv6C035j.d23j
Vendor Version: Ap6v35j.23j 68

DS Channel1 DS Channel0 US Channel1 US Channel0
Speed (kbps): 0 55822 0 8192
SRA Previous Speed: 0 57491 0 8797
Previous Speed: 0 57491 0 8797
Reed-Solomon EC: 0 0 0 3283
CRC Errors: 0 173328 0 4583
Header Errors: 0 71556 0 0
Interleave (ms): 0.00 0.00 0.00 0.00
Actual INP: 0.00 0.00 0.00 0.00

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

router>

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Jase2985

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#1542156 26-Apr-2016 12:45

because on some lines some of the upload is sacrificed to give you a better download