3Com CS/3000-48 Installation Manual

Contents

Chassis 1-5The following sections describe the motherboard, auxiliary processor board,and hardware interrupt switch. Refer to “CS/3100 Internal Diskette Drive” and“Power Supply Module” for more information on components shown inFigure 1-2.Motherboard The motherboard is secured to the bottom of the chassis and includes themain processor for the server. Table 1-1 lists the main components on themotherboard and briefly describes their functions.Auxiliary ProcessorBoardThe auxiliary processor board is fastened on top of the motherboard andincludes the main processor for the 16-port asynchronous modules.Table 1-2 lists the main components on the auxiliary processor board andbriefly describes their functions.Table 1-1 Motherboard ComponentsComponent FunctionMotorola® 68EC030 or equivalentprocessorOperates at 20 MHz and functions as the server’s main processor.4 MB of private memory and 2MB of shared memoryPrivate memory is intended for software code. Shared memory provides storage forpacket data and control and status information used by the Ethernet controller.This arrangement provides better performance than single-memory-based servers.Parallel printer connector Provides the connection between the server and a parallel printer.Console connector Provides the connection between the server and a console.Auxiliary connector Reserved for internal 3Com use and not currently operational.Ethernet interface moduleconnectorProvides the connection between the server and an Ethernet interface module.EEPROM Contains configurable firmware parameters and commands to reboot or reset theserver, make copies of the software distribution diskette, perform diagnostic tasks,and so on. These parameters and commands can be accessed via the monitorutility. For more information, refer to Appendix C, “Monitor Utility.”Table 1-2 Auxiliary Processor Board ComponentsComponent FunctionMotorola 68EC030 orequivalent processorOperates at 20 MHz and functions as the processor for all 16-port asynchronous modules.128 KB static RAM Provides high performance with high-speed CPU access for program execution.Three 16-port asynchronousmodule connectorsProvide the connection between the server and the asynchronous modules.CS3000BookFile Page 5 Tuesday, October 15, 1996 5:12 PM