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Serial console server

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A serial console server or serial console concentrator is a device that allows many RS-232 serial ports to be accessible remotely, technically it is a Terminal Server configured in reverse mode. Typically, the device has 8, 16, 32 or 64 serial ports, either DE-9, MMJ or RJ-45-wired, connected to the serial ports of other equipment, such as servers, routers or switches. It is then possible to telnet- (or dail-) in to the serial console server and access any of the ports for out-of-band management. Some more modern servers even include SSH support.

Renowned makers of serial console servers are Perle Systems or the Cyclades Corporation. Of course, many other companies build and sell such devices, and you can even build your own.

An alternative approach used in some cluster setups is to null-modem wire and Daisy-chain consoles to otherwise unused serial ports on nodes with some other primary function.

See also

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