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Cabletron Systems SEHI-22FL manual The following sections describe Device Statistics screen ﬁelds

Models: SEHI-22FL

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The Device Statistics Screen

The following sections describe Device Statistics screen ﬁelds:

BYTES RECEIVED

Displays the number of bytes received.

FRAMES RECEIVED

Displays the number of frames received.

ERRORS RECEIVED

Displays the number of errors received.

COLLISIONS

Displays the number of collisions received.

OOW COLLISIONS

Displays the number of Out Of Window collisions. OOW collisions are usually caused by the network being too long where the round trip propagation delay is greater than 51.2 ∝s (the collision domain is too large), a station somewhere on the network is violating Carrier Sense and transmitting at will, or a cable somewhere on the network failed during the transmission of the packet.

CRC ERRORS

Displays the number of packets with bad Cyclic Redundancy Checks (CRC) that have been received from the network. The CRC is a 4-byte ﬁeld in the data packet that ensures that the transmitted data that is received is the same as the data that was originally sent.

ALIGNMENT ERRORS

Displays the number of errors due to misaligned packets.

RUNT PACKETS

Displays the number of runt packets received from the network. A runt packet is less than the minimum Ethernet frame size of 64 bytes, not including preamble.

GIANT PACKETS

Displays the number of packets received whose size exceeded 1518 data bytes, not including preamble.

SEHI User’s Guide

7-21

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Cabletron Systems SEHI-22FL manual The following sections describe Device Statistics screen ﬁelds

Contents

SEHI-22FL INTELLIGENT STACKABLE HUB USER’S GUIDE SEHI User’s Guide VCCI NOTICE FCC NOTICEDOC NOTICE SEHI User’s GuideCABLETRON SOFTWARE PROGRAM LICENSE EXCLUSION OF WARRANTY AND DISCLAIMER OF LIABILITYCABLETRON SYSTEMS, INC. PROGRAM LICENSE AGREEMENT SEHI User’s GuideUNITED STATES GOVERNMENT RESTRICTED RIGHTS SEHI User’s GuideCHAPTER 3 INSTALLATION REQUIREMENTS AND CONTENTSCHAPTER 2 SEHI FEATURES AND OPTIONS SPECIFICATIONSCHAPTER 5 CONNECTING TO THE NETWORK ContentsINSTALLATION TROUBLESHOOTINGAPPENDIX A ContentsAPPENDIX B IMAGE FILE DOWNLOAD USING OIDs EPIM INFORMATION1.1 USING THIS MANUAL CHAPTER INTRODUCTION1.2 DOCUMENT CONVENTIONS anonymous 1.3 GETTING HELP1.4 RELATED MANUALS your email addressPower Supply CHAPTER SEHI FEATURES AND OPTIONSRESET Button ON/OFF SwitchRepeater Functionality 2.2 SEHI FEATURES2.1 SEHI OVERVIEW FLASH EEPROMs2.3 STACKABLE CAPABILITIES 2.4 REMOTE NETWORK MANAGEMENT CAPABILITIESHubSTACK Interconnect Cables 2.5 OPTIONAL FEATURESEthernet Port Interface Modules EPIMs Rack Mount HardwareCHAPTER INSTALLATION REQUIREMENTS AND SPECIFICATIONS 3.1 CABLE SPECIFICATIONSFiber Optic Budget and Propagation Delay 3.1.1 HubSTACK Interconnect Cable Requirements3.1.2 10BASE-FL Fiber Optic Network Requirements AttenuationLength 3.1.3 10BASE-T UTP and STP Cable SpeciﬁcationsDelay Insertion Loss3.2 NETWORK PORT SPECIFICATIONS 3.3 COM PORT REQUIREMENTS 3.4 TRANSCEIVER REQUIREMENTSDelay Times JAM Speciﬁcations 3.5 OPERATING SPECIFICATIONSDelay Time Start of Packets Speciﬁcations System Speciﬁcations3.6 POWER SUPPLY REQUIREMENTS 3.7 ENVIRONMENTAL REQUIREMENTS 3.8.1 Safety3.9 PHYSICAL SPECIFICATIONS 3.8 AGENCY APPROVALSCHAPTER INSTALLATION 4.1 UNPACKING THE SEHI4.3 INSTALLING THE SEHI 4.2 PRE-INSTALLATION TESTChapter 4 Installation In order to allow for proper cooling, there must be a two-inch 4.3.1 Tabletop or Shelf Installationclearance on either side and the back of the unit 4.3.2 Rackmount Installation Figure 4-4 Installing the Rack Mounting Brackets Rack Mounting the SEHIFigure 4-5 Installing the SEHI in the Rack 4.3.3 Stacking the SEHIChapter 4 Installation The cooling fans at the rear panel of the SEHI must haveTo stack SEH non-intelligent hubs together, proceed as follows 4.4 CONNECTING THE SEHI TO THE POWER SOURCE 4.5 ADDING/REPLACING EPIMS 5.1 CONNECTING THE SEHI TO THE NETWORK CHAPTER CONNECTING TO THE NETWORK5.1.1 Connecting Network Ports Do not touch the ends of the ﬁber optic strands, and do not let Chapter 5 Connecting to the Networkthe ends come in contact with dust, dirt, or other contaminants 3. Attach the fiber labeled 2 to the applicable TX port, on the SEHI 5.1.2 Connecting a UTP Segment to an EPIM-T Connecting the SEHI to the Network 5.1.3 Connecting a Fiber Segment to an EPIM-F1/F2/F3SEHI User’s Guide 3. Attach the fiber labeled 2 to the applicable TX port on the module Connecting the SEHI to the Network F1/F2 ST Connectors F1/F2 SMA 906 Connectors w Half Alignment SleevesSMA 905 Connectors F3 ST Connectors SEHI User’s Guide5.1.4 Connecting a Thin Coaxial Segment to an EPIM-C Ensure that the Signal Quality Error SQE or “heartbeat” test 5.1.5 Connecting an AUI Cable to an EPIM-AConnecting the SEHI to the Network function is disabled on the external transceiver connected tob. Check the cable for continuity Toward Back 5.1.6 Connecting an AUI Cable to an EPIM-XON Position of EPIM5.2 FINISHING THE INSTALLATION CHAPTER TROUBLESHOOTING 6.1 INSTALLATION CHECKOUT6.2 USING LANVIEW SEHI-22FL 6.3 USING THE RESET BUTTON 6.4 SETTING THE NVRAM SWITCH CHAPTER LOCAL MANAGEMENT SEHI User’s Guide 7.1 LOCAL MANAGEMENT KEYBOARD CONVENTIONSChapter 7 Local Management Table 7-1 Keyboard Conventions7.2 MANAGEMENT TERMINAL SETUP Connect the console cable to the SEHI as follows Management Terminal Setup Parameters 7.3 ACCESSING LOCAL MANAGEMENT 7.4 THE FEATURE SELECTION SCREEN Figure 7-3 Feature Selection Screen7.5 THE COMMUNITY NAME TABLE SCREEN COMMUNITY NAMEACCESS write access to Local Management. Super-UserEditing the Community Name Field 7.6 THE CONFIGURATION SCREEN The following sections explain each ﬁeld on the Conﬁguration screen Use the following steps to set the IP Address Setting the Default Gateway Using the Port Enable Override7.7 THE TRAP TABLE SCREEN Use the following steps to conﬁgure the Trap table 7.8 THE SNMP TOOLS SCREEN Allows the user to retrieve MIB objects using SNMP protocol Getting Individual OIDs Setting an OIDGetting the Next OID 5. Press ENTER. “DATA” appears Cycling Through OIDs 7.9 THE DEVICE STATISTICS SCREENExiting the SNMP Tools Screen The following sections describe Device Statistics screen ﬁelds This command lets the user enable the selected port To select a module or port Using the DISABLE PORT Command Exiting the Device Statistics ScreenAPPENDIX A EPIM INFORMATION A.1 EPIM SPECIFICATIONSA.1.1 EPIM-T A.1.2 EPIM-F1 and EPIM-F2 Appendix A EPIM InformationA.1.3 EPIM-F3 Connector Type A.1.4 EPIM-CGrounding A.1.5 EPIM-A and EPIM-X AUI Port Figure A-5 The EPIM-A and EPIM-XAPPENDIX B IMAGE FILE DOWNLOAD USING OIDs B.1 SETTING UP A UNIX WORKSTATION AS A TFTP SERVER B.2 STANDARD TFTP DOWNLOAD SEHI User’s Guide Appendix B Image File Download Using OIDsTable B-1 Standard TFTP Download Procedure StepSEHI User’s Guide INDEXNumerics Index-1Index-2 IndexSEHI User’s Guide SPANISH POWER SUPPLY CORDGERMAN FRENCH