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339 posts

Ultimate Geek
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Topic # 95116 28-Dec-2011 09:33
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We were using a Cisco SRP527W for Xnet Fusion for a house we had in Palmerston North. Near the end of its time there, it was syncing at ADSL2+ speeds without any trouble.

It was no longer needed there, so we brought it home to replace our WAG120, which while it isn't a great device, it wasn't giving us any real trouble.

After plugging the SRP in and setting up the WAN on it, I sat back and watched as the DSL light refused to come on. It would flash for a few seconds, then go dark for a while, then flash for a few more seconds etc.

In the end, I was able to get our internet going by going into the "hidden" dsldiag.asp page on the device and forcing G.dmt. This isn't the most desirable outcome however, as if we ever have a power cut, or need to reboot the device, I have to go into that dsldiag page again and coax it into connecting.


Does anyone know if there is anything we can do to get this device working properly? It is a very nice device, and wasn't cheap, and I'd hate for us to not be able to get the best out of our connection (pitiful though it may be--our ADSL2+ isn't a whole lot better than plain ADSL) 




Thanks 

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589 posts

Ultimate Geek
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  Reply # 562078 28-Dec-2011 09:37
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Try getting Xnet to have the interleaving switched off on your DSL connection, which should solve the problem.



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Ultimate Geek
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  Reply # 562081 28-Dec-2011 09:41
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I forgot to add our ISP here where we are using the device now is Telecom.

Do Telecom allow for interleaving to be switched off? 

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Ultimate Geek
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  Reply # 562086 28-Dec-2011 10:00
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Not sure about that, you could always ask them.

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Uber Geek
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  Reply # 562087 28-Dec-2011 10:03
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Tried the usual tests like unplugging all your phones/alarms etc.?





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  Reply # 562088 28-Dec-2011 10:04
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There are some known issues with this device on the new Ikanos linecards if you're close to the cabinet or exchange (ie have a low attenuation). There are a few threads on here discussing the issue and WorldxChange had some beta firmware that seemed to solve the issue.



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Ultimate Geek
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  Reply # 562102 28-Dec-2011 10:40
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Our current ADSL stats are the following with the SRP:

ADSL Status
DSL Status:Showtime
DSL Modulation Mode:G.DMT
Downstream Rate:5728 Kbps
Upstream Rate:896 Kbps
Downstream Noise Margin:11.5db
Upstream Noise Margin:17.0db
Downstream Line Attenuation:28.0
Upstream Line Attenuation:14.0
Downstream Transmit Power:17.6
Upstream Transmit Power:12.5 


And these are the stats from the dsldiag page:

xdslctl: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 8000
Max: Upstream rate = 1248 Kbps, Downstream rate = 6432 Kbps
Channel: INTR, Upstream rate = 896 Kbps, Downstream rate = 5728 Kbps

Link Power State: L0
Mode: G.DMT
Trellis: ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 11.6 17.0
Attn(dB): 28.0 14.0
Pwr(dBm): 17.6 12.5
G.dmt framing
K: 180(0) 29
R: 12 16
S: 1 8
D: 64 8
Counters
SF: 41489034 41489000
SFErr: 383 0
RS: 2821254378 352655497
RSCorr: 1547912 0
RSUnCorr: 9500 0

HEC: 343 0
OCD: 6 0
LCD: 0 0
Total Cells: 938443857 0
Data Cells: 340650696 0
Drop Cells: 0
Bit Errors: 0 0

ES: 206 0
SES: 0 0
UAS: 4811 4811
AS: 705313

INP: 2.00 2.06
PER: 1.75 1.75
delay: 16.00 16.00
OR: 32.00 32.00

Bitswap: 0 0

 
As far as I can tell, according to the telecom wholesale broadband map, we are about the only section in our area that has NOT been cabinetised. We are connected directly to the exchange, which isn't that close to us.

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  Reply # 562656 29-Dec-2011 20:37
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With 28dB downstream attenuation, I wouldn't think you'd be seeing the short line issues.

What firmware are you currently running?



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Ultimate Geek
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  Reply # 562671 29-Dec-2011 21:28
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Firmware version: 1.01.23 (006) Jun 17 2011

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  Reply # 562787 30-Dec-2011 09:17
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You could try the next rev firmware - it addresses the short line DSL issue, although I wouldn't have thought that was your problem. Be aware there are reported issues with DNS relay in that firmware, which may or may not be an issue for you.

Are you able to try the SRP at another location, just to confirm it isn't faulty?



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  Reply # 562812 30-Dec-2011 10:20
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Success!!

I updated to the latest firmware we're in business with a "blazing fast"* connection.


Current ADSL stats:

DSL Status:Showtime
DSL Modulation Mode:ADSL2+
Downstream Rate:8128 Kbps
Upstream Rate:1113 Kbps
Downstream Noise Margin:12.9db
Upstream Noise Margin:13.0db
Downstream Line Attenuation:31.5
Upstream Line Attenuation:14.2
Downstream Transmit Power:0.0
Upstream Transmit Power:12.6

Thank you everybody for your help and input.


*Well, for this house anyway...

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  Reply # 562815 30-Dec-2011 10:36
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Excellent - good to hear!

No problems with DNS?



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Ultimate Geek
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  Reply # 562820 30-Dec-2011 11:03
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I'm not entirely sure what I should be looking for entirely... but all seems ok at the moment.

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  Reply # 562826 30-Dec-2011 11:20
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shermanp: I'm not entirely sure what I should be looking for entirely... but all seems ok at the moment.


You'd know if you were having DNS issues - pretty much nothing would work on the internet!



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Ultimate Geek
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  Reply # 562827 30-Dec-2011 11:24
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I figured that might be the case, however I wasn't really sure widespread the reported DNS bug is. 

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Ultimate Geek
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  Reply # 562829 30-Dec-2011 11:38
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Positive result in the end, excellent.

Happy New Years

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