Verifying ADSL Interface Properties

Purpose

Verify that the interface properties are correct.

Action

From the CLI, enter the show interfaces interface-name extensive command.

Sample Output

user@host> show interfaces at-1/0/0
extensive

 Physical interface: at-1/0/0, Enabled, Physical link is Up
   Interface index: 141, SNMP ifIndex: 49, Generation: 142
   Link-level type: ATM-PVC, MTU: 4482, Clocking: Internal, ADSL mode,
   Speed: ADSL, Loopback: None
   Device flags   : Present Running
   Link flags     : None
   CoS queues     : 8 supported, 8 maximum usable queues
   Hold-times     : Up 0 ms, Down 0 ms
   Current address: 00:05:85:c3:17:f4
   Last flapped   : 2008-06-26 23:11:09 PDT (01:41:30 ago)
   Statistics last cleared: Never
   Traffic statistics:
    Input  bytes  :                    0                    0 bps
    Output bytes  :                    0                    0 bps
    Input  packets:                    0                    0 pps
    Output packets:                    0                    0 pps
   Input errors:
     Errors: 0, Drops: 0, Invalid VCs: 0, Framing errors: 0,Policed discards: 0, L3 incompletes: 0, L2 channelerrors: 0, L2 mismatch timeouts: 0,
     Resource errors: 0
   Output errors:
     Carrier transitions: 3, Errors: 0, Drops: 0, Aged packets: 0, MTU errors: 0, Resource errors: 0
   ADSL  alarms   : None
   ADSL  defects  : None
   ADSL media:            Seconds        Count State
    LOF                       1            1  OK
    LOS                       1            1  OK
    LOM                       0            0  OK
    LOP                       0            0  OK
    LOCDI                     0            0  OK
    LOCDNI                    0            0  OK
   ADSL status:
     Modem status  : Showtime (Adsl2plus)
     DSL mode      :     Auto    Annex A
     Last fail code: None
     Subfunction   : 0x00
     Seconds in showtime : 6093
   ADSL Chipset Information:               ATU-R                ATU-C
     Vendor Country :                       0x0f                 0xb5
     Vendor ID      :                       STMI                IFTN
     Vendor Specific:                       0x0000              0x70de
   ADSL Statistics:                        ATU-R                ATU-C
     Attenuation (dB)         :              0.0                  0.0
     Capacity used(%)         :              100                  92
     Noise margin(dB)         :              7.5                  9.0
     Output power (dBm)       :             10.0                  12.5
                                   Interleave       Fast  Interleave         Fast
     Bit rate (kbps)   :                    0      24465           0         1016
     CRC               :                    0          0           0         0
     FEC               :                    0          0           0         0       
     HEC               :                    0          0           0         0             
     Received cells    :                    0         49
     Transmitted cells :                    0          0
   ATM status:
     HCS state:     Hunt
     LOC      :       OK
  ATM Statistics:
    Uncorrectable HCS errors: 0, Correctable HCS errors: 0,Tx cell FIFO overruns: 0,Rx cell FIFO overruns: 0,Rx cell FIFO underruns: 0,
    Input cell count: 49, Output cell count: 0,Output idle cell count: 0,Output VC queue drops: 0Input no buffers: 0, Input length errors: 0,
    Input timeouts: 0, Input invalid VCs: 0, Input bad CRCs: 0, Input OAM cell no buffers: 0

  Packet Forwarding Engine configuration:
     Destination slot: 1
     Direction : Output
     CoS transmit queue               Bandwidth               Buffer  Priority   Limit  
                               %            bps     %           usec
     0 best-effort            95        7600000    95              0       low    none          
     3 network-control         5         400000     5              0       low    none     

    
     
     But for ADSL MiniPim TI chipset does not send  ADSL Chipset
     Information. Also Adsl minipim does not send any alarms. So we can't
     show alarm stats for minipim. So following information will not be
     displayed in Minipim case.
     
     ADSL  alarms   : None
     ADSL  defects  : None   
     ADSL media:            Seconds        Count State
     LOF                       1            1  OK
     LOS                       1            1  OK
     LOM                       0            0  OK
     LOP                       0            0  OK
     LOCDI                     0            0  OK
     LOCDNI                    0            0  OK

    ADSL Chipset Information:               ATU-R      ATU-C
      Vendor Country :                       0x0f       0xb5
      Vendor ID      :                       STMI       IFTN
      Vendor Specific:                       0x0000     0x70de

Meaning

The output shows a summary of interface information. Verify the following information:

The physical interface is Enabled. If the interface is shown as Disabled, do either of the following:
- In the CLI configuration editor, delete the disable statement at the [edit interfaces interface-name] level of the configuration hierarchy.
- In the J-Web configuration editor, clear the Disable check box on the Interfaces>interface-name page.
The physical link is Up. A link state of Down indicates a problem with the interface module, interface port, or physical connection (link-layer errors).
The Last Flapped time is an expected value. The Last Flapped time indicates the last time the physical interface became unavailable and then available again. Unexpected flapping indicates likely link-layer errors.
The traffic statistics reflect expected input and output rates. Verify that the number of inbound and outbound bytes and packets matches expected throughput for the physical interface. To clear the statistics and see only new changes, use the clear interfaces statistics interface-name command.
No ADSL alarms and defects appear that can render the interface unable to pass packets. When a defect persists for a certain amount of time, it is promoted to an alarm. The following are ADSL-specific alarms:
- LOCDI–Loss of cell delineation for interleaved channel
- LOCDNI—Loss of cell delineation for non-interleaved channel
- LOF—Loss of frame
- LOM—Loss of multiframe
- LOP—Loss of power
- LOS—Loss of signal
- FAR_LOF—Loss of frame in ADSL transceiver unit-central office (ATU-C)
- FAR_LOS—Loss of signal in ATU-C
- FAR_LOCDI—Loss of cell delineation for interleaved channel in ATU-C
- FAR_LOCDNI—Loss of cell delineation for non-interleaved channel in ATU-C

Examine the operational statistics for an ADSL interface. Statistics in the ATU-R (ADSL transceiver unit–remote) column are for the near end. Statistics in the ATU-C (ADSL transceiver unit–central office) column are for the far end.

Attenuation (dB)—Reduction in signal strength measured in decibels.
Capacity used (%)—Amount of ADSL usage in %.
Noise Margin (dB)—Maximum extraneous signal allowed without causing the output to deviate from an acceptable level.
Output Power (dBm)—Amount of power used by the ADSL interface.
Bit Rate (kbps)—Data transfer speed on the ADSL interface.

Verifying ADSL Interface Properties

Purpose

Action

Sample Output

Meaning

Related Topics