In brief:
Use crossover cable for this connection:
workstation to workstation;
workstation to server;
hub to switch;
switch to switch.
Use straight-through cable for this connection:
workstation to hub;
workstation to switch;
server to hub;
server to switch.
Read more: <a target="_blank" href=http://www.intel.com/support/express/hubs/standalone/sb/cs-011247.htm> Determining which cable to use</a>.
<font color=blue>To find a fault is easy; to do better may be difficult.</font color=blue> (Plutarch)