Topic 'Frequent disconnects with 1801' in forum 'Cisco' - dslreports.com http://www.dslreports.com/forum/Frequent-disconnects-with-1801-19850659 en Fri, 10 Feb 2012 13:05:46 EDT Fri, 10 Feb 2012 13:05:46 EDT Re: Frequent disconnects with 1801 http://www.dslreports.com/forum/Re-Frequent-disconnects-with-1801-19867778
Also found this which confirms it was a known fault with BT (UK) ADSL lines:
»cgi.tolien.co.uk/cisco-adsl/]]> http://www.dslreports.com/forum/Re-Frequent-disconnects-with-1801-19867778 Thu, 24 Jan 2008 17:30:28 EDT Re: Frequent disconnects with 1801 http://www.dslreports.com/forum/Re-Frequent-disconnects-with-1801-19852983 ftp://ftp.cisco.com/pub/access/800/ are compatible with the 1801. The associated documentation gives details of the upgrade process. It is also likely that a newer IOS version also has a more recent DSL firmware included.]]> http://www.dslreports.com/forum/Re-Frequent-disconnects-with-1801-19852983 Tue, 22 Jan 2008 14:18:18 EDT Frequent disconnects with 1801 http://www.dslreports.com/forum/Frequent-disconnects-with-1801-19850659
They were every 5 mins, but I changed dsl operating-mode to itu-dmt and that has helped - now about every 30 minutes.

Having been searching on these forums, I suspect I may benefit from setting dsl noise-margin 3 on interface atm0, however this gives an invalid input error? Does the 1801 not support this command?

The results of show interface dsl atm0 are shown below if anyone has any other suggestions to improve things?

I read on one site that some lines just aren't good enough to support cisco routers - is that true? Does the output below suggest that might be the case?

ATM0Alcatel 20190 chipset information                ATU-R (DS)                      ATU-C (US)Modem Status:    Showtime (DMTDSL_SHOWTIME)DSL Mode:        ITU G.992.1 (G.DMT) Annex AITU STD NUM:     0x01                            0x1Vendor ID:       'STMI'                          'TSTC'Vendor Specific: 0x0000                          0x0000Vendor Country:  0x0F                            0xB5Capacity Used:   99%                             85%Noise Margin:    14.0 dB                         11.0 dBOutput Power:    19.5 dBm                        12.5 dBmAttenuation:     49.0 dB                         23.5 dBDefect Status:   None                            NoneLast Fail Code:  NoneWatchdog Counter: 0x56Watchdog Resets: 0Selftest Result: 0x00Subfunction:     0x00Interrupts:      3936 (0 spurious)PHY Access Err:  0Activations:     21LED Status:      ONLED On Time:     100LED Off Time:    100Init FW:         embeddedOperation FW:    embeddedFW Version:      2.5.42                  Interleave             Fast    Interleave              FastSpeed (kbps):          4192                0           832                 0Cells:               166020                0       2778111                 0Reed-Solomon EC:        131                0             2                 5CRC Errors:              92                0             1                 5Header Errors:           89                0             4                 4Total BER:                3616E-8                0E-0Leakage Avarage BER:  3616E-8                0E-0LOM Monitoring : Disabled DMT Bits Per Bin000: 0 0 0 0 0 0 6 8 9 A B B B B C B010: B C B B B B B A A A A 9 9 7 6 0020: 0 0 0 0 0 B B C C B B B A A 4 A030: B B B B B B B B B B A B B B B A040: 0 A 2 A 9 A 9 A A A A A A A A A050: A A A A A 9 A A 9 9 9 9 9 9 9 9060: 9 9 9 9 9 9 9 9 9 9 9 8 9 9 9 9070: 9 9 8 9 8 8 9 9 9 9 8 8 8 8 8 7080: 8 8 8 8 9 7 7 8 5 7 6 7 8 8 7 7090: 7 7 7 7 6 7 7 7 7 7 7 7 7 6 6 50A0: 5 5 7 6 6 5 7 6 7 6 6 6 6 5 5 30B0: 4 3 4 5 5 5 4 4 3 2 0 0 0 0 0 20C0: 2 2 3 2 3 3 3 3 2 3 2 2 2 2 0 00D0: 0 0 0 0 0 0 0 0 0 2 2 2 2 2 2 20E0: 2 0 0 2 2 2 2 2 0 0 0 0 0 2 0 20F0: 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 DSL: Training log buffer capability is not enabled
]]> http://www.dslreports.com/forum/Frequent-disconnects-with-1801-19850659 Tue, 22 Jan 2008 06:18:26 EDT