07-16-2011 09:03 AM - edited 03-04-2019 01:00 PM
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.
Solved! Go to Solution.
07-20-2011 02:13 AM
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.
07-19-2011 07:25 AM
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
07-19-2011 04:31 PM
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.
07-19-2011 11:43 PM
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.
07-20-2011 02:13 AM
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.
07-20-2011 10:35 AM
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?
07-21-2011 09:40 AM
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.
07-21-2011 03:50 PM
Indeed. Thanks for the nice rating and good luck!
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