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Internet disconnecting more frequently due to attenuation from cisco router

Hello Friends,

We have Cisco 877 Router, Everything is going fine, but  Router doing work fine, But some time router Doesn't flow Traffic & stop working, if  I restarted Router then again All is going well, I can't imagine why & What's happening is because of..
I thought it must be due to the power off, but even if the power failed, I would expect it to start up again once the power came back on...

I notice your line attenuation is pretty high at 53.0 dB - this value is the loss of signal strength between the DSLAM and your equipment. Different routers can effect this too, but 53.0db is pretty high and could be effecting the stability if your line. THis could explain why the cisco unit is having issues reconnecting..

It may be that with the billion connected the attenuation is reduced a little.

It will be a greta if anyone suggest me how to resolve this issue

Cisco877#sh dsl int atm 0
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:       0x03                     0x1
Vendor ID:      'STMI'                     'IFTN'
Vendor Specific: 0x0000                     0x71B9
Vendor Country:      0x0F                     0xB5
Chip ID:       C196 (0)
DFE BOM:      DFE3.0 Annex A (1)
Capacity Used:      43%                     44%
Noise Margin:      24.0 dB                27.0 dB
Output Power:      16.5 dBm                12.0 dBm
Attenuation:      53.0 dB                31.5 dB
Defect Status:      None                            None                       
Last Fail Code:      None
Watchdog Counter: 0x54
Watchdog Resets: 0
Selftest Result: 0x00
Subfunction:      0x00
Interrupts:      8252 (0 spurious)
PHY Access Err:      0
Activations:      1
LED Status:      ON
--More--                           LED On Time:      100
LED Off Time:      100
Init FW:      init_AMR-3.0.014_no_bist.bin
Operation FW:      AMR-3.0.014.bin
FW Source:      embedded
FW Version:      3.0.14

           Interleave          Fast     Interleave          Fast
Speed (kbps):            1472                0            256                0
Cells:                29265                0         504637                0
Reed-Solomon EC:          2                0              0                0
CRC Errors:               0                0              0                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


--More--                           DMT Bits Per Bin
000: 0 0 0 0 0 0 0 0 2 3 4 5 5 5 6 5
010: 5 6 6 6 5 5 5 4 0 3 4 4 3 2 2 0
020: 0 4 5 5 6 6 5 7 7 7 7 7 7 7 7 7
030: 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
040: 0 7 7 7 6 7 3 7 2 5 6 6 4 2 5 5
050: 6 6 6 6 6 5 5 5 4 4 5 5 2 2 5 5
060: 5 5 4 5 5 4 4 4 4 4 2 4 2 2 2 2
070: 2 2 0 0 0 2 2 2 2 2 2 2 0 2 2 2
080: 2 2 2 2 2 2 2 2 2 0 0 0 0 0 0 0
090: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0A0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0B0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0C0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0D0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0E0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0F0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

DSL: Training log buffer capability is not enabled
Cisco877#     exit











1 REPLY
Cisco Employee

Re: Internet disconnecting more frequently due to attenuation f

Vikrant,

If the attenuation is indeed at the core of your problem then I am afraid you cannot do much about it yourself. The attenutation is a characteristic of the local loop between your premises and the DSLAM at the telco's central office. If you believe that the local loop is faulty you should call your telco operator and ask him to come and make a test measurement of the local loop transmission characteristics to reensure it is suited for ADSL service.

So I suggest starting with contacting your telco and making tests of your local loop, and if they come out as being fine (verify the attenuation reported by the telco tech person and your 877!) then you should start troubleshooting your router.

I have had one experience with the 836 model whose ADSL modem quality slowly deteriorated over time to the point that the entire 836 had to be replaced. It also manifested itself as outages in the connectivity with sudden, bursty nature of problems, the router being unable to reconnect and requiring physical restart. And I also remember seeing much worse statistics including the attenuation in the show dsl controllers command, similar to yours. After replacing the router, the new one on the same loop reported much better statistics and has been working fine ever since.

Best regards,
Peter

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