Patent ID: 7840675

Claim:
A server system comprising a plurality of server modules, a management unit for managing the whole of the system and first wiring for connecting said plurality of server modules to enable them to mutually transmit signals, wherein each server module includes: a reference clock generator for outputting a reference clock; a first clock distributor and a second clock distributor, said first clock distributor for receiving the reference clock outputted from said reference clock generator to deliver it directly to said second clock distributor of its own server module to second clock distributors of its own server module and all of the other server modules by way of said first wiring, said second clock distributor being operative to select one reference clock signal among a reference clock signal outputted directly from the first clock distributor of its own server module through a second wiring, a reference clock signal outputted by way of said first wiring from the first clock distributor of its own server module and a reference clock signal outputted from the first clock distributors of any of the other server modules, and to distribute the selected one reference clock signal to said its own server module; and a module management unit responsive to configuration information transmitted from said management unit to command said second clock distributor to perform switching of selecting the one reference clock signal to be distributed to said its own server module; wherein a length of a wiring line connecting directly the first clock distributor in the one server module and the second clock distributor in the one server module through said first wiring is equal to a length of a wiring line connecting directly the first clock distributor in the one server module and the second clock distributor in each of the other server modules through said first wiring.