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Glossary
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BLACK BOX
®
Advanced Console Server
Terminal Server
A terminal server has one Ethernet LAN port and many RS-232 serial ports. It is used to con-
nect many terminals to the network. Because they have the same physical interfaces, terminal
servers are sometimes used as console access servers.
TTY
The UNIX name for the COM (Microsoft) port.
U Rack height unit
A standard computer rack has an internal width of 17 inches. Rack space on a standard rack is
measured in units of height (U). One U is 1.75 inches. A device that has a height of 3.5 inches
takes 2U of rack space.