Accton Technology 1500 manual Collision

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EtherHub 1500 System User’s Guide

These LEDs monitor the share of valid network frames transmitted by this hub within a 10Mbps bandwidth. They provide a quick way to monitor the current traffic load relative to the network’s capacity.

Collision

Label (%)

1% 3% 5%

10%

15+%

Color

Green

Amber (yellow)

Red

Function

Indicates the percentage of packet collisions occurring out of the total packets received by the hub.

Collisions occur when two or more devices connected to a hub attempt to transmit data simultaneously on the network. When a collision occurs, devices pause and then re-transmit after a pseudo-random wait period. Because wait periods differ among devices, successive collisions become increasingly improbable.

The Collision LEDs assist the network manager in monitoring the percentage of packet collisions occurring relative to the total packets received by the hub. Similar to Utilization LEDs, the Collision LEDs have 5 numbers representing collision percentage. When collisions reach a level marked on the LED display, the corresponding LED lights up.

For example, if packet collisions reach 1%, the LED labeled 1% will light up. However, if collisions go beyond 1% (e.g., 15%), the LED labeled 15+ and all the other LEDs before it (i.e., 1, 3, 5, and 10) will also light up in rapid succession.

ΦWhen more than 31 consecutive collisions occur on the cable segment connected to a port, that port is automatically partitioned by the hub. The hub automatically reconnects this port when a data packet longer than 512 bits (normal) is transmitted or received by the partitioned port without collision. This applies to all STP ports and the ALT PORT.

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Hardware Description

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Contents EtherHub 1500 System EtherHub 1500 System QWHUQDWLRQDO-HDGTXDUWHUV FCC Warning Sicherheitshinweise About this Guide Package Contents Contents Hardware Installation Setup and ConfigurationApplications Appendix B Pin Assignments Appendix a Product SpecificationsAppendix C Product Support Services Glossary IndexList of Figures Overview EtherHub 1500 SystemOverview Overview Features of EtherHub 1500 System ∙ BNC EH1551, default module preinstalled in EH1500Distinguishing Factors of EtherHub 1500 System EtherHub 1500 System User’s Guide Chapter Hardware Description Front Panel DisplaysSmartWatch LED Panel SmartWatch LED Panel for EtherHub-16i+Color Green Label PWR/CPU Function Power indicator Terminator Snmp EtherHub 1500 System User’s Guide Jabber EtherHub 1500 System User’s Guide Alert Collision EtherHub 1500 System User’s Guide Segment LED Indicators EtherHub 1500 System User’s Guide Hub ID Indicators Partition Link PARTITION/DISABLED Configure Button Daisy-Chain Switch STP Station PortsSocket Switch Rear Panel DisplaysBUS Power Socket Power SwitchChapter Hardware Installation Before You BeginHardware Installation Stacking Hubs without a Rack Stacking Hubs without a RackMounting Hubs Using a Mounting Rack Mounting Hubs on a RackConnecting the Hub System EtherHub 1500 System User’s Guide Preparing for System Configuration Connecting the Hub’s RS232 Serial Port to a PC COM PortEtherHub 1500 Site Running the Out-of-Band Configuration Program Installing an Snmp Backup Agent EtherHub 1500 System User’s Guide Diagnostic Tests Chapter Setup and ConfigurationSystem Setup Multi-Segment Architecture FlexBus 1500 Management Link Hub ID SettingSnmp Backup Agent Port Backup Function Preparing for Configuration Management Hot Remove FunctionFrom a local console ∙ Terminal Channel for local hookup Menu Trap Managers Download Restart Factory Settings System MenuChanging System Configuration Downloading System Software Hub Port Backup Port Push Button Control MenuConfiguring Port Parameters Performance Menu Threshold MenuTo set thresholds Using the Configure Button To summarize Active LEDs Segment LEDs Attach the hub to one segment Master Agent Setting EtherHub-16mi+only Diagnostic function Applications Attaching Stack to One SegmentAttaching Stack to Three Segments Attaching Hubs in Stack to 3 SegmentsAttaching Stack to Multiple Segments Linking Part of the Stacked Hubs to a SegmentEach Hub is Isolated Stacked Hubs Not Linked to a SegmentExtending the Network with STP/BNC Connections Linking a Stack to a Network Management Station Linking Stacked Hubs to a Network Management StationInterconnecting Segments Linking Segments in a Stacked SystemLinking a Distributed Segment Linking a Distributed SegmentLinking Distributed Segments Distributed Multi-Segment EnvironmentPhysical Characteristics Appendix a Product SpecificationsFeatures Specifications for FlexBus 1500 Cable PVCAttenuation for Horzontal FlexBus 1500 Cable Next for Horizontal FlexBus 1500 CableStandards Compliance USARS232 Port Pin Description Appendix B Pin AssignmentsFlexBus 1500 Pin Description DB9 Serial Port to RJ-45 Converter Connector Pin Assignment DB25 RS232 to RJ-45 Converter Connector Pin Assignment DCE Port Hardware Repair Service Appendix C Product Support ServicesProblem Report Product RegistrationSoftware Update and Upgrade Service Bulletin Board Service BBSInteractive Fast Fax U.S.A. office Technical SupportLimited Warranty Customer RemediesReturn Process North and South AmericaOrdering Information Glossary 10BASE-TLED Out-of-Band Index Index Index Troubleshooting EH1501s EH1502s E0895-R01