Figure 12. Serial Port Mux Logic; Figure 13. Rj45 Serial B Port Jumper Block Location And Setting - Intel SE7520JR2 Technical Manual

Functional Architecture
SIO
3.4.10.2.4 Rear RJ45 Serial B Port Configuration
The rear RJ45 Serial B port is a fully functional serial port that can support any standard serial
device. Using an RJ45 connector for a serial port gives direct support for serial port
concentrators, which are widely used in the high-density server market. 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.
To support either of two serial port configuration standards which require either a DCD or DSR
signal, a jumper block (J7A1), located near the back IO ports, is used to configure the RJ45
serial port to the desired standard. The following diagram shows the jumper block location and
its jumper settings.

Figure 13. RJ45 Serial B Port Jumper Block Location and Setting

68
Serial B
Serial A
Level
Shifter
Header

Figure 12. Serial Port Mux Logic

3
1
Pins 1&3 – DCD to DTR
*Pins 2&4 – DSR to DTR
* = Factory Default
C78844-002
Intel® Server Board SE7520JR2
Bus
Exchange
2 to 1
Mux
Level
shifter
Rear
RJ45
4
2
BMC
Revision 1.0