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.

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xSeries 343 Hardware Maintenance Manual

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Image 30
IBM 343 manual RJ45 Serial Port, Rear COM2 Port Adapter Pin-out, RJ45 Signal Abbreviation