Electronic device and system composed of a plurality of electronic devices

An electronic device comprising:

• a cabinet having a plurality of first guide pins each having a first diameter;
• a shelf accommodated in the cabinet, said shelf having a floating mechanism, a plurality of guide rails for guiding a plurality of printed circuit board units, and a plurality of second guide pins each having a second diameter smaller than said first diameter of each first guide pin;
• and
• a plurality of printed circuit board units inserted in said shelf along said guide rails;
• each of said printed circuit board units having a connector and a third guide pin having a third diameter smaller than said second diameter, said third guide pin being independent of said connector.

A system composing of a plurality of electronic devices comprising:

• a first electronic device;
• and
• a second electronic device mechanically and electrically connectable to said first electronic device;
• said first electronic device comprising:
• a first cabinet;
• a first shelf accommodated in said first cabinet, said first shelf having a floating mechanism and a plurality of first guide rails;
• a plurality of first printed circuit board units inserted in said first shelf along said first guide rails, each of said first printed circuit board units having a first connector;
• a plurality of first guide pins fixed to said first cabinet, each of said first guide pins having a first diameter;
• and
• a plurality of second guide pins fixed to said first shelf, each of said second guide pins having a second diameter smaller than said first diameter;
• said second electronic device comprising:
• a second cabinet;
• a second shelf fixedly accommodated in said second cabinet, said second shelf having a plurality of second guide rails;
• a backplane mounted on said second shelf, said backplane having a plurality of second connectors respectively engageable with said first connectors of said first printed circuit board units;
• a plurality of second printed circuit board units inserted in said second shelf along said second guide rails and electrically connected to said backplane;
• a plurality of first guide holes formed in said second cabinet for respectively engaging said first guide pins;
• and
• a plurality of second guide holes formed in said second shelf for respectively engaging said second guide pins.

A system composing of a plurality of electronic devices comprising:

• a first electronic device;
• and
• a second electronic device mechanically and electrically connectable to said first electronic device;
• said first electronic device comprising:
• a first cabinet;
• a first shelf accommodated in said first cabinet, said first shelf having a floating mechanism and a plurality of first guide rails;
• a plurality of first printed circuit board units inserted in said first shelf along said first guide rails, each of said first printed circuit board units having a first connector;
• a plurality of first guide pins fixed to said first cabinet, each of said first guide pins having a first diameter;
• and
• a plurality of second guide pins fixed to said first shelf, each of said second guide pins having a second diameter smaller than said first diameter;
• said second electronic device comprising:
• a second cabinet;
• a second shelf fixedly accommodated in said second cabinet, said second shelf having a plurality of second guide rails;
• a backplane fixed to said second cabinet, said backplane having a plurality of second connectors respectively engageable with said first connectors of said first printed circuit board units;
• a plurality of second printed circuit board units inserted in said second shelf along said second guide rails and electrically connected to said backplane;
• a plurality of first guide holes formed in said second cabinet for respectively engaging said first guide pins;
• and
• a plurality of second guide holes formed in said second cabinet for respectively engaging said second guide pins.