I/O and Cabling Considerations
3.2.4
DECconnect RJ-45 Cables
Figure 3-5 shows the DECconnect-compatible cables available from Xyplex and shows how the
cables are wired. The Male RJ-45 connector is attached to the server. The MMJ connector
attaches to the DECconnect-compatible device (DTE). The cable is a crossover cable that uses
the six inner pins of the server port and makes the signals available at the MMJ connector.
The cable is constructed using standard six-wire cable.
DEConnect Crossover Cable
Male RJ-45
Connector
Male MMJ
Connectors
1 RING/CTS
2 DTR
3 XMT
4 XMTGND
5 RCVGND
6 RCV
7 DSR/DCD
8 RTS
6 DSR
5 RCV
4 RCVGND
3 XMTGND
2 XMT
1 DTR
Figure 3-5. RJ-45 DECconnect Cable
If you have existing DECconnect cables that you want to use with the RJ-45 serial ports, the one-
foot straight through cable and the RJ-45 to MMJ adaptor or modular adaptor allow you to use
these cables without making any changes. You can also use the male RJ-45 to female MMJ
adaptor. You should also note that DECconnect cables do not support hardware flow control.
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