Solved: 877w and ADSL2+

giedrius.rekasius · ‎07-16-2011

I set up 877w to connect to my ISP's ADSL2+ line, but it's able to connect only in ADSL1 mode:

DSL Mode: ITU G.992.1 (G.DMT) Annex A

I tried every possible way to set up ATM0 interface, but had no luck to make it work in ADSL2+ mode. If I set this mode explicitly router isn't able to sync with ISP (CD light just keeps blinking). Previous router was able to connect in ADSL2+ mode so line itself is fine. I contacted my ISP and they assured me that line is ok and that 877w is supported by them and should be able to connect in ADSL2+ mode. They suggested to play around with different ADSL firmwares so I did that. My router came with ADSL firmware version 3.0.14. I tested it with: 3.0.43 and 4.0.17, but none of them made any difference. The last suggestion which came from my ISP was that router is faulty and I should replace it. While I'm no technician it looks a bit strange to me that faulty router is able to work perfectly in ADSL1 mode.

Is it possible that hardware is faulty but affects only ADSL2+ mode?

I attached my configuration as well. Probably I overlooked something in it.

Those are configuration requirements from my ISP:

Encapsulation: PPPoE

Multiplexing: LLC Based

VPI: 8

VCI: 35

Many thanks for your help.

paolo bevilacqua · ‎07-20-2011

Please post "show dsl interface" taken with FW 4.0.17 and the circuit synced up.

Are you in the UK? Any chance you have an Annex M circuit ?

No other debugs are useful or necessary.

View solution in original post

paulstone80 · ‎07-19-2011

If a firmware upgrade isn't working, I would try debugging the atm events to get some more information.

If you haven't already tried debugging, have a look at this document and skip to the Layer 2 Issues section.

http://www.cisco.com/en/US/tech/tk175/tk15/technologies_configuration_example09186a008071a7c2.shtml

HTH,

Paul

HTH Paul ****Please rate useful posts****

paolo bevilacqua · ‎07-19-2011

Which dslam and version the ISP is using?

Have they specifically confirmed thet they have other customers using an 877 in adsl2+ mode on the same DSLAM type ?

Does another router work in ADSL2+ mode ?

The router is unlikely to be fault, but it can be incompatible.

giedrius.rekasius · ‎07-19-2011

Hi Paolo,

Which dslam and version the ISP is using?

Unfortunately I don't have my ISP's DSLAM details, but they assured me that the router in question is fully supported in ADSL2+ mode.

Have they specifically confirmed thet they have other customers using an 877 in adsl2+ mode on the same DSLAM type ?

Well, no they didn't confirm that there are other clients with the same router, but when I reported the issue they asked for IOS version and then confirmed that router is fully supported. I don't think they can provide me with the details about their DSLAM or client base.

Does another router work in ADSL2+ mode ?

The old router works fine in ADSL2+ mode and syncs to 12Mb/s.

The router is unlikely to be fault, but it can be incompatible.

That's what I think as well. Unfortunately I can't debug it at the moment as Paul adviced, but I plan to do that next weekend so should be able to provide more details.

Many thanks for your help.

paolo bevilacqua · ‎07-20-2011

Please post "show dsl interface" taken with FW 4.0.17 and the circuit synced up.

Are you in the UK? Any chance you have an Annex M circuit ?

No other debugs are useful or necessary.

giedrius.rekasius · ‎07-20-2011

Please post "show dsl interface" taken with FW 4.0.17 and the circuit synced up.

ATU-R (DS) ATU-C (US)

Modem Status: Showtime (DMTDSL_SHOWTIME)

DSL Mode: ITU G.992.1 (G.DMT) Annex A

ITU STD NUM: 0x03 0x2

Vendor ID: 'STMI' 'BDCM'

Vendor Specific: 0x0000 0x6198

Vendor Country: 0x0F 0xB5

Chip ID: C196 (3)

DFE BOM: DFE3.0 Annex A (1)

Capacity Used: 70% 99%

Noise Margin: 19.5 dB 7.0 dB

Output Power: 19.5 dBm 12.0 dBm

Attenuation: 17.0 dB 11.5 dB

Defect Status: None None

Last Fail Code: None

Watchdog Counter: 0xCE

Watchdog Resets: 0

Selftest Result: 0x00

Subfunction: 0x00

Interrupts: 8292 (0 spurious)

PHY Access Err: 0

Activations: 1

LED Status: ON

LED On Time: 100

LED Off Time: 100

Init FW: init_AMR_4.0.017.bin

Operation FW: AMR-E-4.0.017.bin

FW Source: external

FW Version: 4.0.17

Interleave Fast Interleave Fast

Speed (kbps): 7616 0 1024 0

Cells: 37319206 0 5424307 0

Reed-Solomon EC: 0 0 376 0

CRC Errors: 0 0 1 0

Header Errors: 0 0 0 0

Total BER: 0E-0 0E-0

Leakage Average BER: 0E-0 0E-0

ATU-R (DS) ATU-C (US)

Bitswap: enabled enabled

Bitswap success: 0 0

Bitswap failure: 0 0

LOM Monitoring : Disabled

DMT Bits Per Bin

000: 0 0 0 0 0 0 0 7 9 B C C C C D D

010: E D D E E E D D D D D C C B B B

020: 0 6 7 6 7 9 0 0 0 0 0 0 0 0 0 0

030: 0 B B B B B B B B B B B B B C C

040: 0 C C C C C C C C C C C C C C C

050: C C C C C C C C C C C C C C C C

060: C C C B B C C C C C B B B B B B

070: B B B B B B B B B B B B B B B B

080: B B B B 2 B B B B A A B A A A A

090: A A A A A A A A A A A A A A A A

0A0: A A A A A A A A A A A A A A A A

0B0: A A A 9 A A A A A A A A A A A A

0C0: A A A A A A A A 9 9 9 9 9 9 9 9

0D0: 9 9 9 9 9 9 9 9 9 9 9 9 9 9 8 9

0E0: 9 9 9 9 9 8 9 8 8 9 8 8 9 9 9 9

0F0: 9 9 9 9 9 9 9 9 9 9 9 8 9 9 8 9

DSL: Training log buffer capability is not enabled

Are you in the UK? Any chance you have an Annex M circuit ?

I'm in Ireland. Well, I think there is a chance that my ISP uses Annex M circuit. However when I asked them about Annex M they said that my router should work just fine. I assume tech guy might not have understood what Annex M means.

What if my ISP uses Annex M circuit? Is there a way to make it work under 877w? Also how do I know for sure if they use it?

giedrius.rekasius · ‎07-21-2011

I contacted my ISP today and it turns out that it's indeed Annex M circuit. So I'm looking for a new router

Thanks for your help.

paolo bevilacqua · ‎07-21-2011

Indeed. Thanks for the nice rating and good luck!