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877w and ADSL2+

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.

1 ACCEPTED SOLUTION

Accepted Solutions
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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

7 REPLIES 7
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Participant

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****
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Hall of Fame Master

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.

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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.

Highlighted

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

Highlighted

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?

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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.

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Indeed. Thanks for the nice rating and good luck!

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