15        Auto- Negotiation Error
  14        Speed Changed
  13        Duplex Changed
  12        Page Received
  11        Auto- Negotiation Completed
  10        Link Status Changed
  9         Symbol Error
  8         False Carrier
  7         FIFO Over/ Underflow
  6         MDI Crossover Changed
  5         Downshift Inter rupt
  4         Energy Detect Changed
  3         Reserved
  2         DTE power detection sta- tus changed interrupt
  1         Polarity Changed
  0         Jabber