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Cabletron Systems SEHI-22FL manual HubSTACK Interconnect Cable Requirements, Attenuation

Models: SEHI-22FL

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Chapter 3: Installation Requirements and Speciﬁcations

3.1.1HubSTACK Interconnect Cable Requirements

Attach the SEHI to modules in the stack with the SEHI HubSTACK Interconnect cable available only from Cabletron Systems. Refer to Chapter 1 for cable part numbers. The cable attaches to the SEHI rear panel bus port.

The rear panel of the SEHI has an Interconnect Bus Out port (male connector) to stack SEH non-intelligent hubs together. Stack up to four SEH hubs together with one SEHI.

3.1.210BASE-FL Fiber Optic Network Requirements

Table 3-1 shows Multimode Fiber Optic Cable speciﬁcations for the SEHI-22FL.

Table 3-1 Multimode Fiber Optic Cable Speciﬁcations

	Cable Type	Attenuation	Maximum Cable Length


	50/125 ∝m	13.0 dB or less	Maximum ﬁber optic cable length is 2
			km (2187.2 yds). However, IEEE 802.3
	62.5/125 ∝m	16.0 dB or less	km (2187.2 yds). However, IEEE 802.3
	62.5/125 ∝m	16.0 dB or less	speciﬁcations allow for a maximum of 1

	100/140 ∝m	19.0 dB or less
	100/140 ∝m	19.0 dB or less	km (1093.6 yds).

Attenuation

Test the ﬁber optic cable with a ﬁber optic attenuation test set adjusted for an 850 nm wavelength. This test veriﬁes that the signal loss in a cable is within an acceptable level. Table 3-1 shows the attenuation for each Multimode cable type.

Fiber Optic Budget and Propagation Delay

Determine the maximum ﬁber optic cable length by calculating the ﬁber optic budget delay and total network propagation before the ﬁber optic cable runs are incorporated into a network design.

Fiber optic budget is the combination of the optical loss due to the ﬁber optic cable, in-line splices, and ﬁber optic connectors.

Propagation delay is the amount of time it takes data to travel from the sending device to the receiving device. Total propagation delay allowed for the network is 25.6 ∝s (51.2 ∝s roundtrip). If the total propagation delay between any two nodes on the network exceeds 25.6 ∝s, then use bridges.

3-2	SEHI User’s Guide

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Cabletron Systems SEHI-22FL HubSTACK Interconnect Cable Requirements, 3.1.2 10BASE-FL Fiber Optic Network Requirements

Contents

SEHI-22FL INTELLIGENT STACKABLE HUB USER’S GUIDE SEHI User’s Guide DOC NOTICE FCC NOTICEVCCI NOTICE SEHI User’s GuideCABLETRON SYSTEMS, INC. PROGRAM LICENSE AGREEMENT EXCLUSION OF WARRANTY AND DISCLAIMER OF LIABILITYCABLETRON SOFTWARE PROGRAM LICENSE SEHI User’s GuideSEHI User’s Guide UNITED STATES GOVERNMENT RESTRICTED RIGHTSCHAPTER 2 SEHI FEATURES AND OPTIONS CONTENTSCHAPTER 3 INSTALLATION REQUIREMENTS AND SPECIFICATIONSINSTALLATION ContentsCHAPTER 5 CONNECTING TO THE NETWORK TROUBLESHOOTINGAPPENDIX B IMAGE FILE DOWNLOAD USING OIDs ContentsAPPENDIX A EPIM INFORMATIONCHAPTER INTRODUCTION 1.1 USING THIS MANUAL1.2 DOCUMENT CONVENTIONS 1.4 RELATED MANUALS 1.3 GETTING HELPanonymous your email addressRESET Button CHAPTER SEHI FEATURES AND OPTIONSPower Supply ON/OFF Switch2.1 SEHI OVERVIEW 2.2 SEHI FEATURESRepeater Functionality FLASH EEPROMs2.4 REMOTE NETWORK MANAGEMENT CAPABILITIES 2.3 STACKABLE CAPABILITIESEthernet Port Interface Modules EPIMs 2.5 OPTIONAL FEATURESHubSTACK Interconnect Cables Rack Mount Hardware3.1 CABLE SPECIFICATIONS CHAPTER INSTALLATION REQUIREMENTS AND SPECIFICATIONS3.1.2 10BASE-FL Fiber Optic Network Requirements 3.1.1 HubSTACK Interconnect Cable RequirementsFiber Optic Budget and Propagation Delay AttenuationDelay 3.1.3 10BASE-T UTP and STP Cable SpeciﬁcationsLength Insertion Loss3.2 NETWORK PORT SPECIFICATIONS 3.4 TRANSCEIVER REQUIREMENTS 3.3 COM PORT REQUIREMENTSDelay Time Start of Packets Speciﬁcations 3.5 OPERATING SPECIFICATIONSDelay Times JAM Speciﬁcations System Speciﬁcations3.6 POWER SUPPLY REQUIREMENTS 3.9 PHYSICAL SPECIFICATIONS 3.8.1 Safety3.7 ENVIRONMENTAL REQUIREMENTS 3.8 AGENCY APPROVALS4.1 UNPACKING THE SEHI CHAPTER INSTALLATIONChapter 4 Installation 4.2 PRE-INSTALLATION TEST4.3 INSTALLING THE SEHI clearance on either side and the back of the unit 4.3.1 Tabletop or Shelf InstallationIn order to allow for proper cooling, there must be a two-inch 4.3.2 Rackmount Installation Rack Mounting the SEHI Figure 4-4 Installing the Rack Mounting BracketsChapter 4 Installation 4.3.3 Stacking the SEHIFigure 4-5 Installing the SEHI in the Rack 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 5.1.1 Connecting Network Ports CHAPTER CONNECTING TO THE NETWORK5.1 CONNECTING THE SEHI TO THE NETWORK the ends come in contact with dust, dirt, or other contaminants Chapter 5 Connecting to the NetworkDo not touch the ends of the ﬁber optic strands, and do not let 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 SEHI User’s Guide 5.1.3 Connecting a Fiber Segment to an EPIM-F1/F2/F3Connecting the SEHI to the Network 3. Attach the fiber labeled 2 to the applicable TX port on the module SMA 905 Connectors F3 ST Connectors F1/F2 ST Connectors F1/F2 SMA 906 Connectors w Half Alignment SleevesConnecting the SEHI to the Network SEHI User’s Guide5.1.4 Connecting a Thin Coaxial Segment to an EPIM-C Connecting the SEHI to the Network 5.1.5 Connecting an AUI Cable to an EPIM-AEnsure that the Signal Quality Error SQE or “heartbeat” test function is disabled on the external transceiver connected tob. Check the cable for continuity ON Position 5.1.6 Connecting an AUI Cable to an EPIM-XToward Back of EPIM5.2 FINISHING THE INSTALLATION 6.1 INSTALLATION CHECKOUT CHAPTER TROUBLESHOOTING6.2 USING LANVIEW SEHI-22FL 6.3 USING THE RESET BUTTON 6.4 SETTING THE NVRAM SWITCH CHAPTER LOCAL MANAGEMENT Chapter 7 Local Management 7.1 LOCAL MANAGEMENT KEYBOARD CONVENTIONSSEHI User’s Guide 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 Figure 7-3 Feature Selection Screen 7.4 THE FEATURE SELECTION SCREENCOMMUNITY NAME 7.5 THE COMMUNITY NAME TABLE SCREENEditing the Community Name Field write access to Local Management. Super-UserACCESS 7.6 THE CONFIGURATION SCREEN The following sections explain each ﬁeld on the Conﬁguration screen Use the following steps to set the IP Address Using the Port Enable Override Setting the Default Gateway7.7 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 the Next OID Setting an OIDGetting Individual OIDs 5. Press ENTER. “DATA” appears Exiting the SNMP Tools Screen 7.9 THE DEVICE STATISTICS SCREENCycling Through OIDs The following sections describe Device Statistics screen ﬁelds This command lets the user enable the selected port To select a module or port Exiting the Device Statistics Screen Using the DISABLE PORT CommandA.1.1 EPIM-T A.1 EPIM SPECIFICATIONSAPPENDIX A EPIM INFORMATION Appendix A EPIM Information A.1.2 EPIM-F1 and EPIM-F2A.1.3 EPIM-F3 Grounding A.1.4 EPIM-CConnector Type Figure A-5 The EPIM-A and EPIM-X A.1.5 EPIM-A and EPIM-X AUI PortAPPENDIX B IMAGE FILE DOWNLOAD USING OIDs B.1 SETTING UP A UNIX WORKSTATION AS A TFTP SERVER B.2 STANDARD TFTP DOWNLOAD Table B-1 Standard TFTP Download Procedure Appendix B Image File Download Using OIDsSEHI User’s Guide StepNumerics INDEXSEHI User’s Guide Index-1SEHI User’s Guide IndexIndex-2 GERMAN POWER SUPPLY CORDSPANISH FRENCH