Getting Started with MAXserver Access Servers
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Also, NBase-Xyplex recommends that you use different colored wires for
straight-through and crossover cables, in order to keep track of the cable
type. For example, NBase-Xyplex recommends silver wire for making
crossover cables and black wire for making straight-through cables.
RJ-45 Wiring Considerations
You should give special consideration to the wiring scheme when connecting
a device such as a terminal to a MAXserver serial port. The MAXserver is
considered a DTE device. If you want to connect to another DTE device such
as a terminal that is also DTE, you will need a crossover wiring scheme
somewhere in the cabling. (Communication between DTE-to-DTE devices
requires a crossover.) When a DCE device is connected to a MAXserver
serial port, straight-through wiring is required.
To make a modular cable with a crossover, you need only crimp the RJ-45
connector in the same direction at both ends. This crosses all wires in the
cable. To make a modular straight-through cable, you need only crimp the
RJ-45 connector in opposite directions at both ends. Figure 12 shows the
crossover and straight-through wiring schemes.
The crossover connects the MAXserver transmit data (XMT) line to the
receive data (RCV) line of the user DTE device. Similarly, the MAXserver
receive data (RCV) line crosses over to the transmit data (XMT) line of the
user DTE device. The other signals are crossed over in a similar manner
(see Figure 12).
