3Com 4005 Installation And Maintenance Manual

Also see for 4005: Key Information Guide Datasheet

Contents

3Com 4005 Installation And Maintenance Manual Manual pdf 14 page image

14 CHAPTER 2: OVERVIEW OF THE S WITCH 4005Switch BackplaneArchitectureA star-wired scheme of traces inside the chassis, which is called the backplane, isused to connect each interface module slot to the Switch Fabric ManagementModule (SFMM) slots. A module, fan tray, or power supply connects to thebackplane when it is inserted into a slot and its connectors engage the connectorsthat are inside the chassis.As shown in Figure 3, the Switch 4005 backplane design offers: 12 Gbps of non-blocking bandwidth capacity Passive design, meaning that there are no active components that can fail Support for dual, redundant Switch Fabric Management Modules (SFMMs) Support for system communication between the SFMM and interface modulesfor control signals, detection, and other management activities.Figure 3 Backplane Architecture of the Switch 4005The backplane connector on each module provides easy access to all the servicesfrom the Switch 4005 backplane: a data channel for network traffic between the SFMM and interface modules a control channel that passes signals for module detection module diagnostics LED operation between the SFMM and interface modules a Serial Communication Interface (SCI) communications channel that operatesbetween two SFMMs (if installed) to keep their configurations synchronizedTraffic between ports on the same interface module does not enter the backplane;that is, the interface modules provide layer 2 and layer 3 switching when thepacket’s destination is a locally attached node. Interface modules send packetsthat have non-local destination addresses across the backplane to the SFMMwhich then switches the packets to the appropriate interface module.GigabitDataTracesSCISwithc Fabric & Management Slot M1UARTControlTracesInterface Slot 1Interface Slot 2Interface Slot 3Interface Slot 4Interface Slot 5Interface Slot 6Interface Slot 7Interface Slot 8Interface Slot 9Interface Slot 10Interface Slot 11Interface Slot 12Swithc Fabric & Management Slot M2