How do you switch the hold switch?

On what? this makes no sense.

yes it does, however it is not called a Hold switch its called a Sleep on/off switch, and its not really a switch its more of a button that you press.

switch is faulty <><><> As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed....

packet switching can be considered an improvement over message switching.Similar to message switching,packet switching forwards data on first come first serve basis between nodes and no dedication...

cross cable