Excelan link level tests

[jbn at wdl1.UUCP]

     Note that this is all for the Excelan card in dumb Ethernet controller
mode, not with its onboard IP/TCP.  We have both Excelan and CMC boards in
a VME cage, as well as an Excelan board in a Multibus cage on a Masscomp,
and are waiting for software delivery on both.  CMC claims that 1Mb/sec
is possible in end-to-end FTP operations using their card; we look forward
to trying this.