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