PortServer Terminal Server
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Page 91
RJ Connectors
There are four types of modular plugs that can be used with the PortServer's RJ-45 10-pin jack.
These are the 4 or 6-pin RJ-11 plugs, and the 8 or 10-pin RJ-45 plugs.
The 8 and 10-pin RJ-45 plugs are the same physical size, but the 10-pin version has one
additional wire at each end of the row of contacts. Thus pins 1-8 of an 8-pin RJ-45 directly
correspond to pins 2-9 of a 10-pin RJ-45 connector.
Similarly, the two RJ-11 plugs have the same physical dimensions, but the 6-pin version has an
extra pin at each end. The RJ-11 plugs are physically smaller than RJ-45 plugs, but are designed
so that they fit into the center of an RJ-45 jack. In this way, the four pins closest to the center of
any size connector will always carry the same signals as the middle four pins of any other
connector. The contacts of a 6-pin RJ-11 connector correspond directly to the middle six pins of
an 8 or 10-pin RJ-45 connector, and so on.
The diagrams on the following pages illustrate the relationship of the various modular plug
configurations to Digi’s standard 10-pin RJ-45 jack, and show which RS-232 signals are
available in each configuration.
