Causes the link subentity to transmit an SMT Echo request
    frame and await the response. If a response is received, it is
    displayed.

    echo  [node node-id] fddi station station-name link link-id
          target lan address timeout integer-16 data octet-string

1  –  Arguments

 o  data

    Data to transmit in echo request.

 o  target

    48-bit LAN address of the target.

 o  timeout

                           Value: 1-65535

    Timeout, in seconds, optional.