Sun Microsystems Cobalt LX50, Руководство пользователя

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Chapter 2: Installing the Server in a Rack
2-28 User Guide—Sun Cobalt LX50 Server
Both front and back serial connectors cannot be used at the same time. Logic on the server Main Board determines
which connector is in use.
If the front serial port is in use, the rear panel serial port is automatically disabled. When the front-panel serial port
connection is removed, the system automatically re-enables the rear panel serial port.
The front RJ-45 usage model is intended for PC-to-PC serial communication only. It shares common serial signals
with the RJ-45 serial port, located on the back of the system. However, it does not support a modem, as there is no
RI signal. Instead it sets pin 5 to ground, causing logic on the Main Board to disable the rear serial port when a cable
or adapter is plugged into it.
For a direct connect or PC-to-PC serial communication, either an 8-pin RJ-45-to-DB9 adapter or a cable supporting
both DB-9 and RJ-45 connectors is necessary. Table 8 provides a pinout for the front RJ-45-to-DB9 adapter cable.
Table 7. RJ-45 Connector Usage
Mode Front Back
Modem No Yes
Serial Concentrator No Yes
PC-to-PC communication Yes Yes
Table 8. Front RJ-45 Serial 2 Port Adapter Pinout
Signal Name RJ-45 DB9
No connect N/A 1
SIN 6 2
SOUT 3 3
DTR 2 4
GND 4
5
a
a. The use of a modem on this port cannot be
supported due to the lack of the RI signal.
DSR 7 6
RTS 1 7
CTS 8 8
RI 5
5
1
No connect 9
✍
Note: Sun Microsystems provides an optional RJ-45 to DB9 Serial Adapter Kit (order number
X5026A) for purchase. It contains three RJ-45-to-DB9 adapters. They can be plugged into the
front or rear EMP connectors. The cables are:
• DSR Peripherals cable (for rear panel connector data set ready (DSR) peripherals)
• DCD Modem cable (for rear panel connector data carrier detect (DCD) modem)
• Front EMP cable (for front Emergency Management Port)