Accton Technology 12se manual Precise Guidelines for Configuring Multiple Hubs

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Fast EtherHub-12se User’s Guide

Precise Guidelines for Configuring Multiple Hubs

A detailed formula for calculating maximum cable length was provided in the section on 3UHFLVH￿&DEOH￿/HQJWK￿%XGJHWLQJ in Chapter 2. This formula stated that the

maximum length of cabling that can be run from end-node to end-node is:

367m ³ S(repeater equivalent length)

+ S(length of category 5 twisted-pair cable)

+ (0.9 * S(length of fiber optic cable1)) 1 - if fiber is used

For the daisy chain of three hubs shown in Figure Chapter 3:-4, communications must

be supported for node pairs AB and AC. In this case, first determine the limitations on cable length found on the longest path (i.e., the path with the longest delay time).

Remember that this Class II device has an inherent repeater delay of 90 bit time or 80 meters of twisted-pair cable. Therefore, if node A and B are linked to repeaters 1 and 3 respectively (each using 50 meters of twisted-pair cable), then the maximum length from node A to B is 367m - (3 x 80m) = 127m and the total inter-hub cabling will be limited to 27 meters (i.e., 127m - 2x50m = 27m). Therefore, if you use 15 meters of twisted-pair cable to connect hubs 1 and 2, then 12 meters of cable can be used to connect hubs 2 and 3.

Moreover, if node A and C are linked to adjacent hubs 1 and 2 in this system, then the maximum length of fiber optic cable that can be used to connect node C to hub 2 is 367m - 2*80m - (50m + 15m) = 0.9 * LengthFX, or 157 meters. However, because this value exceeds the maximum permitted length for fiber optic cable, it must be reduced to 112 meters.

Configuring the Network

3-3

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Contents Fast EtherHub-12se Installation Manual QWHUQDWLRQDO+HDGTXDUWHUV Package Contents Quick Installation Fast EtherHub-12se User’s Guide About this Guide Contents Appendix E Product Support Services Appendix a TroubleshootingAppendix C Specifications Appendix B Port and Cable AssignmentsGlossary Index List of Figures List of TablesIntroduction to Fast Ethernet Product OverviewAccton’s Fast EtherHub System Basic Features Fast EtherHub-12se User’s Guide Pre-Installation Requirements Installing the SystemConnecting the Hub System Making RJ-45 Connections Making Fiber Optic ConnectionsDistance Limit for Fast Ethernet Cabling Installing the System Providing Power to the EtherHub Verifying Port StatusVerifying System Operation Connecting Multiple Hubs Configuring the NetworkStand-Alone Using the RJ-45 Daisy-Chain Port Precise Guidelines for Configuring Multiple Hubs Figure -4 Cabling Limits for Multiple Hub Configuration HardwareReference Front PanelSmartWatch Indicator Panel Color Red Label Alert Function Fan statusHardware Reference Color Red Label RJ-45 Ethernet Ports Fiber Optic Ethernet PortPower Socket Rear PanelAppendix a Troubleshooting Diagnosing Hub IndicatorsConfiguration System DiagnosticsInstallation Hub IntegrityAppendix B RJ-45 PortAppendix C Product Specifications 6WDURU7UHHEMI Certification Appendix DFCC Class B Certification Voluntary Control Council for Interference VCCI-2 CE Mark Declaration of Conformance for EMI and Safety European Community Immunity RequirementsSafety Compliance Underwriters Laboratories IncSicherheitshinweise Hardware Repair Service Appendix E Product Support ServicesProblem Report Product RegistrationBulletin Board Service BBS Software Update and Upgrade ServiceInteractive Fast Fax U.S.A. office Technical Support International HeadquartersLimited Warranty Customer RemediesReturn Process North and South AmericaAccton Offices Ordering InformationGlossary 100BASE-TXLED RJ-45 Connector Index Index EH3012-TF E1296-R01
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12se specifications

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