Master splitter benefits for ADSL2

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openmedia

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#223639 10-Oct-2017 12:25

I moved over the last couple of weeks and the new property had a structured cabling cabinet, but no master splitter.

To get things up and running quickly I used a standard ADSL splitting off a phone jack and got the following performance.

DSL Type: G.992.5 annex A
Bandwidth (Up/Down) [kbps/kbps]: 801 / 14.741
Data Transferred (Sent/Received) [kB/kB]: 0,00 / 0,00
Output Power (Up/Down) [dBm]: 10,5 / 19,0
Line Attenuation (Up/Down) [dB]: 14,5 / 26,0
SN Margin (Up/Down) [dB]: 6,0 / 6,0
Vendor ID (Local/Remote): TMMB / BDCM
Loss of Framing (Local/Remote): 27 / 0
Loss of Signal (Local/Remote): 8 / 0
Loss of Power (Local/Remote): 0 / 0
Loss of Link (Remote): 0
Error Seconds (Local/Remote): 4 / 0
FEC Errors (Up/Down): 56 / 18.759
CRC Errors (Up/Down): 56 / 301
HEC Errors (Up/Down): 155 / 10

At the weekend I installed an xDSL master splitter plus connected the modem directly in the structured cabling cabinet in the garage. Approx 50% boost in upload and a reasonable boost in download. It will be interesting to see how this improves as DLM kicks in

DSL Type: G.992.5 annex A
Bandwidth (Up/Down) [kbps/kbps]: 1.221 / 16.578
Data Transferred (Sent/Received) [kB/kB]: 0,00 / 0,00
Output Power (Up/Down) [dBm]: 10,0 / 18,5
Line Attenuation (Up/Down) [dB]: 14,0 / 25,0
SN Margin (Up/Down) [dB]: 7,0 / 6,5
Vendor ID (Local/Remote): TMMB / BDCM
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 0 / 0
Loss of Power (Local/Remote): 0 / 0
Loss of Link (Remote): 0
Error Seconds (Local/Remote): 0 / 0
FEC Errors (Up/Down): 0 / 108
CRC Errors (Up/Down): 0 / 0
HEC Errors (Up/Down): 1.008 / 0

Generally known online as OpenMedia, now working for Red Hat APAC as a Technology Evangelist and Portfolio Architect. Still playing with MythTV and digital media on the side.

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#1880335 10-Oct-2017 13:19

Nice one openmedia!

Diagnosis driven DLM will kick in pretty quickly and will reach 80% of line optimisation rapidly. After that it can take up to 10 days to reach steady state. ^Mike

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hio77

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#1880338 10-Oct-2017 13:33

Yep that's a typical experience.

Digging into it, I'm seeing you originally had low upstream, Low speeds in the upstream on ADSL is quite typically an indication of internal wiring pulling it down.

Large drop in error rates there, which will be the larger improvement (be it invisible otherwise)

ddDLM has you already on the 6dB profile for snr, but PSD changes still have the chance of netting an extra boost :)

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openmedia

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#1881741 11-Oct-2017 09:38

Internal wiring is all Cat5e for phone but I'm wondering if there is some serious cross talk somewhere as even with the master splitter our voice line is dreadful.

Line isn't quite as good as our old address, but 16 down and 1.2 up isn't too bad until we can get fibre.

Might try a different newer modem to see if it has any differences.

Steven

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coffeebaron

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#1881780 11-Oct-2017 10:04

I did one recently on a farm. It had very poor 7Mbps down / 0.5Mbps up. After the splitter install a bit of an increase to 8/0.8 and no more disconnects. However, SNR was sitting at 27 - so it's been on a major stability profile. Approx 10 days later, dd-DLM has recognised the now clean line and said lets try an SNR of 6. Now connection is running at 16/0.9 - so very happy broadband now.

@hio77 this is a Spark connection, I'll PM you the phone number. If you have time, you may like to post some more stats.

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hio77

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#1881896 11-Oct-2017 12:03

coffeebaron:

I did one recently on a farm. It had very poor 7Mbps down / 0.5Mbps up. After the splitter install a bit of an increase to 8/0.8 and no more disconnects. However, SNR was sitting at 27 - so it's been on a major stability profile. Approx 10 days later, dd-DLM has recognised the now clean line and said lets try an SNR of 6. Now connection is running at 16/0.9 - so very happy broadband now.

@hio77 this is a Spark connection, I'll PM you the phone number. If you have time, you may like to post some more stats.

Can be a little difficult to comment on this without exposing too much about the customer.

However; i can definitely agree with everything above.

When i pull the line back to the last 60 day period one thing you have not covered is very noticeable.

The customer experienced Frequent disconnections (6-16 so often dipping below chorus acceptable levels but probably annoying)

Physical stats, averaging 7102/594 straight up to 16524/901 average.

Drop in line attenuation from 34dB down to 26dB.

ddDLM is very much still training on this line, it was heavily pulled back due to the errors on the line.

Weekly data confirming error rates won't be in until about 2 weeks away to realistically show a drop in errors.

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michaelmurfy

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#1881899 11-Oct-2017 12:10

This line may be quite good for VDSL - what do you think @hio77?

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hio77

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#1881910 11-Oct-2017 12:18

michaelmurfy:

This line may be quite good for VDSL - what do you think @hio77?

at 25dB it can be a mixed bag. (I'm assuming you mean OP)

Personally i love to see VDSL go live, it just requires a clean line (especially at distance)

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openmedia

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#1893119 31-Oct-2017 13:23

Well Chorus had to come out due to a lot of static on the voice line. They've replaced the xDSL Splitter, but I'm now seeing a high number of FEC errors on the line, approximately 300 errors a minute based on a couple of tests. Any ideas?

Uptime: 2 days, 20:30:47
DSL Type: G.992.5 annex A
Bandwidth (Up/Down) [kbps/kbps]: 1.201 / 16.481
Data Transferred (Sent/Received) [kB/kB]: 0,00 / 0,00
Output Power (Up/Down) [dBm]: 10,0 / 19,0
Line Attenuation (Up/Down) [dB]: 14,0 / 25,0
SN Margin (Up/Down) [dB]: 7,0 / 6,5
Vendor ID (Local/Remote): TMMB / BDCM
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 0 / 0
Loss of Power (Local/Remote): 0 / 0
Loss of Link (Remote): 0
Error Seconds (Local/Remote): 0 / 0
FEC Errors (Up/Down): 61 / 2.670.502
CRC Errors (Up/Down): 61 / 76
HEC Errors (Up/Down): 1.677 / 47

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hio77

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#1893120 31-Oct-2017 13:27

i'd do a reboot, see if they don't go away.

Alternatively, it is possible one leg is not terminated fully on the DSL side of splitter. (assuming noise has gone away)

may be difficult to get action based on FEC, i'd ask your RSP to do a 24 hour LQD, after that ask them to check the FEC error rates and raise back to assure(chorus)

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openmedia

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#1893224 31-Oct-2017 16:01

hio77:

i'd do a reboot, see if they don't go away.

Alternatively, it is possible one leg is not terminated fully on the DSL side of splitter. (assuming noise has gone away)

may be difficult to get action based on FEC, i'd ask your RSP to do a 24 hour LQD, after that ask them to check the FEC error rates and raise back to assure(chorus)

Since the splitter swap the noise on the POTs line has disappeared, but based on my wiring I'd say they've installed the two wires off the xDSL splitter the wrong way around for the voice connection.

On the data side the connection looks correct, so I'll try a modem reboot. I've heard this old Technicolor modems occasionally show high FEC rates.

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old3eyes

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#1893226 31-Oct-2017 16:03

Did they have BT jacks at the end of the CAT5 feeds??

Regards,

Old3eyes

openmedia

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#1893264 31-Oct-2017 18:35

The DSL side of the splitter is straight into an RJ45 socket with the modem plugged directly into the socket

The Voice side of the splitter goes into a voice distribution board with cat5 to all of the BT sockets around the house. It appears that the voice cables are reversed but the data cables are correct.

Voice now has no static, but I'm seeing all these FECs on the Data side.

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coffeebaron

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#1893340 31-Oct-2017 21:59

What do you mean voice cables reversed?

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old3eyes

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#1893441 1-Nov-2017 08:47

openmedia:

The DSL side of the splitter is straight into an RJ45 socket with the modem plugged directly into the socket

The Voice side of the splitter goes into a voice distribution board with cat5 to all of the BT sockets around the house. It appears that the voice cables are reversed but the data cables are correct.

Voice now has no static, but I'm seeing all these FECs on the Data side.

Would have thought it was strange for a structured cable house to have BT jacks installed rather than just two RJ45s per outlet.

Regards,

Old3eyes

openmedia

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#1893444 1-Nov-2017 08:55

coffeebaron: What do you mean voice cables reversed?

The Phone side of the xDSL splitter has been wired

Blue (xdsl) -> White (house)

White (xdsl) -> Blue (house)

Generally known online as OpenMedia, now working for Red Hat APAC as a Technology Evangelist and Portfolio Architect. Still playing with MythTV and digital media on the side.

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