Chapter 1. Reference Information; Overview - IBM RS/6000 Enterprise Server M80 Service Manual

Chapter 1. Reference Information

This chapter provides an overview of the system, including a logical description and a physical overview.
Additional details pertaining to the system are also provided, as follows:
v Memory overview and placement
v General description of the operator panel
v Cabling rules
v System location rules and descriptions
v Powering on and off the system
v Power flow
v Data flow

Overview

The RS/6000 Enterprise Server Model M80 and Eserver pSeries 660 Model 6M1 systems are
multiprocessor, multibus systems packaged in two to five drawers. The processors and memory are
packaged in an 8 EIA-unit central electronics complex (CEC) drawer, and the optional DASD and I/O
devices are in 5 EIA-unit I/O drawers. The basic system consists of one CEC drawer and one I/O drawer
in the same rack. You can expand the system by adding up to three additional I/O drawers in a minimum
of two racks.
A number of cables connect the CEC and I/O drawers. These cables include:
v SPCN (System Power Control Network) cables
v V/S COMM cables
v RIO (Remote Input Output) cables
v JTAG cable
An ac power cord (dc power cord in a dc-powered system) is connected to the CEC drawer (drawer 1),
primary I/O drawer (drawer 0), and secondary I/O drawer (drawer 2). You can also connect two additional
secondary drawers (drawers 3 and 4) in another rack with a separate power distribution unit and ac power
cord (dc power cord in a dc-powered system). A dc-powered system has no power distribution unit.
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