What does this diagnostic output mean?
- by ChrisF
I recently had a fault with my broadband connection. It turned out to be a fault with the ISP's or teleco's equipment. My ISP posted this diagnostic, but while I understand it in general, I'd like to to know more about the details.
I'm assuming that ATM means Asynchronous Transfer Mode and PPP means Point to Point Protocol. It was this that my router was indicating as the fault.
  xDSL Status Test Summary
  Sync Status:    Circuit In Sync  
  
  General Information
  NTE Status:     NTE Power Status:   Unknown Bypass Status:   
  
  Upstream DSL Link Information   Downstream DSL Link Information
  Loop Loss:  9.0 17.0
  SNR Margin: 25  15
  Errored Seconds:    0   0
  HEC Errors: 0
  Cell Count: 0   0
  Speed:  448 8128
  TAM Status: Successfully executed operation  
  
  Network Test: Sub-Test Results
  Layer Name    Value   Status
  Modem     pass
      Transmitter Power (Upstream)    12.4 dBm
      Transmitter Power (Downstream)  8.8 dBm
      Upstream psd    -38 dBm/Hz
      Downstream psd  -51 dBm/Hz
  DSL       pass
      Equipment Vendor Name   TSTC
      Equipment Vendor Id n/a
      Equipment Vendor Revision   n/a
      Training Time   8 s
      Num Syncs   1
      Upstream bit rate   448 kbps
      Downstream bit rate 8128 kbps
      Upstream maximum bit rate   1108 kbps
      Downstream maximum bit rate 11744 kbps
      Upstream Attenuation    3.5 dB
      Downstream Attenuation  0.0 dB
      Upstream Noise Margin   20.0 dB
      Downstream Noise Margin 19.0 dB
      Local CRC Errors    0
      Remote CRC Errors   0
      Up Data Path    interleaved
      Down Data Path  interleaved
      Standard Used   G_DMT
  INP
      INP Upstream Symbols    n/a
      INP Upstream Delay  4 ms
      INP Upstream Depth  4
      INP Downstream Symbols  n/a
      INP Downstream Delay    5 ms
      INP Downstream Depth    32
  ATM   Reason: No ATM cells received fail
      Number of cells transmitted 30
      Number of cells received    0
      number of Near end HEC errors   0
      number of Far end HEC errors    n/a
  PPP   Reason: No response from peer fail
      PAP authentication  nottested
      CHAP authentication nottested
(I'm not sure that Super User is the best place to ask this, but two people have suggested I ask it here so here I am).