Abstract: A KVM switch with an expansion module slot is disclosed. The KVM switch comprises a housing, a printed circuit board and an expansion module slot. The housing includes a receiving space, a panel disposed at a side thereof and a removable back panel disposed at another side thereof. The printed circuit is disposed in the receiving space, and comprises a controller, a switching circuit, a plurality of connectors and a plurality of wires. The expansion module slot is disposed corresponding to the back panel and is used for receiving an expansion module.

Abstract: The present invention discloses a bidirectional convertible KVM switch assembly structure and its KVM switch, wherein the assembly structure uses a base to contain a KVM switch connected to a rear end of a four-in-one KVM switch and fixes the KVM switch, and the base and the KVM switch are latched with each other by male and female connectors (or male and female header receptacles), so that the KVM switch with a different number of ports (such as 4 ports, 8 ports or 16 ports) can be changed according to a user's requirement, and it is not necessary to remove the whole 4-in-1 structure and the fixed base for installing the KVM switch, and the KVM switch with a different number of ports can be latched directly with the fixed base.