How to check cable link staus and ndd usage?

checking link status with ndd

 # ndd -set /dev/qfe instance 0 (instance set to "0" checks qfe0 status; "1" for qfe1,etc...)
 # ndd  /dev/qfe link_status
  1
  ( 1 -up, 0 = down                          
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ndd /dev/hme \?    # list all the parameters for the hme drivers

ndd dev/hme link_speed # output the link speed; 0 is 10M, 1 is 100M, 1000 is G