52
DigiBoard Intelligent Serial Communications Boards
Modular Plugs
There are four types of modular plugs that can be used with DigiBoard’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.
