IBM Power 595, Технический обзор и введение, Страница: 59 / 188

Chapter 2. Architectural and technical overview
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2.1.5 System controller (SC) card
Two service processor cards are on the CEC midplane. These cards are referred to as
system controllers (SC). Figure 2-8 shows a system controller.
Figure 2-8 System controller card
The SC card provides connectors for:
Two Ethernet ports (J3, J4)
Two Lightstrips port - one for the front lightstrip (J1) and one for the rear lightstrip (J2)
One System Power Control Network (SPCN) port (J5)
SPCN Control network
The System Power Control Network (SPCN) control software and the system controller
software run on the embedded system controller service processor (SC).
SPCN is a serial communication network that interconnects the operating system and power
components of all IBM Power Systems.It provides the ability to report power failures in
connected components directly to the operating system.It plays a vital role in system VPD
along with helping map logical to physical relationships.SPCN also provides selective
operating system control of power to support concurrent system upgrade and repair.
The SCs implement an SPCN serial link. A 9-pin D-shell connector on each SC implements
each half of the SPCN serial loop. A switch on each SC allows the SC in control to access its
own 9-pin D-shell and the 9-pin D-shell on the other SC.
Each service processor inside SC provides an SPCN port and is used to control the power of
the attached I/O subsystems.
The SPCN ports are RS485 serial interface and uses standard RS485 9-pin female connector
(DB9).
Figure 2-9 on page 48 details the SPCN control network.