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Several female and/or male DB9 connector combinations are available. ABC (2 to 1) switches link one peripheral to two devices. ABCDE (4 to 1) switches connect one peripheral to four devices. Both ABC and ABCDE switches have a wiring harness and use a "stackpole" switching mechanism. They have solder connections from the switching mechanism to the connectors. X switches share two peripherals among two devices. 6 to 1 switches provide access to one peripheral from six devices.