Bus Switches are devices that enable system architecture to be reconfigured. This reconfiguration is mostly accomplished in the test environment and includes but is not limited to simulation of missile firing and switching in or out a new section of bus interface.
Excalibur Systems is the only manufacturer of devices (ESI-R24/27/28) that contain their own TTL driver circuitry that allows them to be directly driven from a computer.
ESI-R27D

DPDT Switches 28V - Internally Terminated, Dual Bus
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ESI-R28

DPDT Switches 5V - Internally Terminated, Internal TTL Driver
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ESI-2310R27

Two Stub Internally Terminated Bus Coupler that can be Switched out of the Circuit to Accommodate Testing.
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ESI-3310R27

Three Stub Internally Terminated Bus Coupler that can be Switched out of the Circuit to Accommodate Testing.
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