i have a cisco 887VA router which lost connection to the WAN and I cant figure out why
the Controller VDSL 0 is up
the ATM0 Int is up
the sub int ATM0.1 is down
and i am unable to ping 22.214.171.124 from wan interface or lan interface
here is some interface outputs:
sh controller vdsl 0
Controller VDSL 0 is UP
Daemon Status: Up
XTU-R (DS) XTU-C (US) Chip Vendor ID: 'BDCM' 'IFTN' Chip Vendor Specific: 0x0000 0x827A Chip Vendor Country: 0xB500 0xB500 Modem Vendor ID: 'CSCO' ' ' Modem Vendor Specific: 0x4602 0x0000 Modem Vendor Country: 0xB500 0x0000 Serial Number Near: FCZ173691XR 887VA-S 15.3(1)T Serial Number Far: 2301230123012301230123012301230 Modem Version Near: 15.3(1)T Modem Version Far: 0x827a
Modem Status: TC Sync (Showtime!) DSL Config Mode: AUTO Trained Mode: G.992.5 (ADSL2+) Annex A TC Mode: ATM Selftest Result: 0x00 DELT configuration: disabled DELT state: not running Trellis: ON ON SRA: disabled disabled SRA count: 0 0 Bit swap: enabled enabled Bit swap count: 9573 0 Line Attenuation: 33.0 dB 19.1 dB Signal Attenuation: 38.9 dB 19.4 dB Noise Margin: 3.1 dB 6.0 dB Attainable Rate: 17452 kbits/s 1076 kbits/s Actual Power: 0.0 dBm 12.6 dBm Total FECC: 311947 0 Total ES: 294 0 Total SES: 27 0 Total LOSS: 0 0 Total UAS: 57 57 Total LPRS: 0 0 Total LOFS: 0 0 Total LOLS: 0 0
Full inits: 1 Failed full inits: 1 Short inits: 1 Failed short inits: 0
Ethernet0 unassigned YES NVRAM down down FastEthernet0 unassigned YES unset down down FastEthernet1 unassigned YES unset up up FastEthernet2 unassigned YES unset down down FastEthernet3 unassigned YES unset down down NVI0 unassigned YES unset administratively down down Virtual-Access1 unassigned YES unset up up Virtual-Access2 unassigned YES unset down down Vlan1 172.24.105.254 YES NVRAM up up
The 3.1 is the most important one as that is downstream. Noise margin is also know as SNR or signal to noise margin, so the lower the number either the more noise there is or the signal strength has degraded too much. With attenuation of 33dB it could be either cause.
The supplier will need to look at putting interleaving on the circuit. The rule of thumb is the lower the attenuation the better and the higher the noise margin the better. Attenuation is mainly to do with copper line quality and the length of the line from the property to the DSLAM.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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