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18 xSeries 343 Hardware Maintenance Manual
RJ45 Serial Port
The rear RJ45 serial port is a fully functional COM port that supports any standard serial device
and provides support for serial concentrators, which typically support RJ45 serial connectors. For
server applications that use a serial concentrator to access the server management features of the
baseboard, a standard 8-pin CAT-5 cable from the serial concentrator is plugged directly into the
rear RJ45 serial port. The 8 pins of the RJ45 connector can be configured to match either of two
pin-out standards used by serial port concentrators. To accommodate either standard, the
J6A2 jumper block located directly behind the rear RJ45 serial port must be jumpered appropriately
according to which standard is desired.
Note
The RJ45 serial port’s default configuration is DSR. For serial concentrators
requiring a DCD signal, configure the jumper block as shown in Figure 39.
For serial concentrators that require a DCD signal, configure the J6A2 jumper block as shown in
Figure 39.
For those server applications requiring a DB9 serial connector, use an 8-pin RJ45-to-DB9 adapter.
Table 6 defines the pin-out required for the adapter to provide RS232 support.
Table 6. Rear COM2 Port Adapter Pin-out
RJ45 Signal Abbreviation DB9
1 Request to Send RTS 7
2 Data Terminal Ready DTR 4
3 Transmitted Data TD 3
4 Signal Ground SGND 5
5 Ring Indicator RI 9
6 Received Data RD 2
7 DCD or DSR DCD/DSR 1 or 6
8 Clear To Send CTS 8
Note
The RJ45-to-DB9 adapter should match the configuration of the serial device
used. One of two pin-out configurations are used depending on whether the
serial device requires a DSR or DCD signal. The final adapter configuration
should also match the desired pin-out of the RJ45 connector, as it can also be
configured to support either DSR or DCD.
ACPI
The server board supports the Advanced Configuration and Power Interface (ACPI) as defined by
the ACPI 1.0 and PC97 specifications. An ACPI aware operating system can put the system into a
state where the hard drives spin down, the system fans stop, and all processing is halted. However,
the power supply will still be on and the processors will still be dissipating some power, so the
power supply fans will still run.