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451-0308 MRV Communications, Inc. www.mrv.com 59
Appendix D - Cabling the LX-4000 Series
NOTE: You would use a "null-modem" cable when making a direct connection between the serial
ports of two communication servers (i.e., no modems involved) or other DTE device. For that
application, use a DTE-to-DTE cable.
RJ-45 Wiring Considerations
You should give special consideration to the wiring scheme when connecting a device such as a
terminal to a LX-4000 Series serial port. The LX-4000 Series is considered a DTE device. To connect
to another DTE device such as a terminal, you will need crossover wiring, as shown in Figure 27 and
Figure 28. When a DCE device is connected to an LX-4000 Series serial port, straight-through wiring
is required, as shown in Figure 29.
NOTE: In general, an ethernet category 3 (CAT 3) or category 5 (CAT 5) may introduce noise due to
the crossing of pins 3 and 6 (transmit and receive). Flat eight wire cables are recommended.
Modular Adapters (RJ-45 to DB-25)
You can obtain adapters with male and female DB-25 connectors from MRV. These adapters direct
signals from the RJ-45 connector on the cable to the correct pin on the DB-25 connector. Figure 27,
Figure 28, and Figure 29 show how devices are cabled when you use these adapters.
Application (see Figure 27): Use RJ-45 to DB-25 to connect your LX-Series unit to a PC.
Figure 27 - Adapter Wiring, LX Series to DTE
CTS
DTR
XMT
GND
RCV
DCD
DSR
RTS
Female RJ-45
Connector
Female DB-25
Connector
DTE Device
Pin Signal
Adaptor Wiring - MX-350-0181
(Female RJ-45 to female DB-25)
Male RJ-45
Connector
Male RJ-45
Connector
Crossover Cable
MAXserver
Connector
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
5
20
2
7
3
8
6
4
CTS/RING
DTR
XMT
XMTGND
RCVGND
RCV
DSR *
RTS
Male
RJ-45
Male
RJ-45
Female
RJ-45
Female
RJ-45
Female
DB-25
Crossover Cable
MAXserver
Connector
Modular Adaptor
To DTE
DTE Cable
*
(See Note, Page 5.)
LX Serie s
LX Se rie s
MX-151-3028
CTS