Cabletron Systems SEHI-24, SEHI-22, SEHI-32, SEHI-34 specs

INSTALLATION REQUIREMENTS/SPECIFICATIONS

2.1.3Multimode Fiber Optic Cable Speciﬁcations for the EPIM-F1 and EPIM-F2 Modules

Table 2-1 shows Multimode Fiber Optic Cable speciﬁcations for the EPIM-F1 and EPIM-F2 modules.

Table 2-1. Multimode Fiber Optic Cable Specifications

	Cable Type	Attenuation	Maximum Cable Length


	50/125 ∝m	13.0 dB or less	The maximum allowable fiber
			optic cable length is 2 km
	62.5/125 ∝m	16.0 dB or less	optic cable length is 2 km
	62.5/125 ∝m	16.0 dB or less	(2187.2 yards). However,
			(2187.2 yards). However,
	100/140 ∝m	19.0 dB or less	IEEE 802.3 specifications
	100/140 ∝m	19.0 dB or less	allow for a maximum of 1 km
			allow for a maximum of 1 km
			(1093.6 yards).

Attenuation

You must 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 2-1 shows the attenuation for each Multimode cable type.

Fiber Optic Budget and Propagation Delay

When determining the maximum ﬁber optic cable length, the ﬁber optic budget delay and total network propagation should be calculated and taken into consideration before ﬁber optic cable runs are incorporated in any 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 entire network is 25.6 ∝sec, if the total propagation delay between any two nodes on the network exceeds 25.6 ∝sec, then bridges should be used.

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Cabletron Systems SEHI-24, SEHI-22 Cable Type Attenuation Maximum Cable Length, Fiber Optic Budget and Propagation Delay

Contents

10BASE-T Intelligent Stackable HUB USER’S Guide Printed On Recycled Paper FCC Notice DOC Notice Cabletron SYSTEMS, INC Program License Agreement Cabletron Software Program License Exclusion of Warranty Disclaimer of Liability United States Government Restricted Rights Table of Contents Troubleshooting InstallationConnecting to the Network Local Management Contents Appendix B Twisted Pair Wiring Tables A-1 Using this Manual Chapter Introduction Introduction Getting Help Sehi Overview Polarity Detection and Correction Sehi FeaturesRepeater Functionality Flash EEPROMs Local Management Reset ButtonLanview LEDs Stackable Capabilities Introduction Optional Features Epim Daughter Board Upgrade Kit Rack Mount or Wall Mount HardwareRelated Manuals Cable Specifications HubSTACK Interconnect Cable Requirements Impedance LengthInsertion Loss Jitter Crosstalk DelayTemperature Noise Fiber Optic Budget and Propagation Delay Cable Type Attenuation Maximum Cable Length Installation REQUIREMENTS/SPECIFICATIONS Cable Type ConnectorsThin-Net Network Requirements for the EPIM-C Module Terminators Network Port Specifications AUI Cable Requirements for the EPIM-A and EPIM-X ModulesAUI Cable SEHI-22 and SEHI-24 Network Port Speciﬁcations SEHI-32 and SEHI-34 Network Port Speciﬁcations Pin Champ Connector Installation REQUIREMENTS/SPECIFICATIONS Epim Specifications EPIM-T EPIM-F1 and EPIM-F2 Parameter Typical Worst Worst Case Typical Value Budget EPIM-F3 EPIM-F3 Parameter Typical Minimum Maximum Connector Type EPIM-C EPIM-A and EPIM-X AUI Port EPIM-A and EPIM-X COM Transceiver Requirements General Delay Times Start of PacketsDelay Times JAM Preamble Output Min. Load Max. Load Max Power Fault ProtectionPower Supply Requirements JAM Output Safety Physical Installing the Sehi Unpacking the Sehi Stacking the Sehi Stacking the Sehi Attaching the Strain Relief Bracket Disconnect SEH and Sehi Interconnect Cables At the OUT Port Installing the Sehi in the Rack Rack Mounting the Sehi Wall Mounting the Sehi Free-Standing Installation Shelf or Table-top Installation Installation Connecting the Sehi to the Power Source Connecting the Sehi to the Network Connecting to Network Ports, SEHI-22 and SEHI-24 EPIM-2 Connecting to Network Ports, SEHI-32 and SEHI-34 Connecting a UTP Segment to an EPIM-T EPIM-T Cross-over Switch Connecting to the Network Connecting to the Network Connecting to the Network Connecting a Thin-Net Segment to an EPIM-C EPIM-C Connecting an AUI Cable to an EPIM-A EPIM-A Connecting an AUI Cable to an EPIM-X Finishing the Installation On Position Toward Back Epim OFF Position Toward Front Chapter Troubleshooting Installation CHECK-OUT Using Lanview PWR CPU RCV Troubleshooting CLNUsing the Reset Button LNK Chapter Local Management Local Management Management Terminal Requirements Console Cable Conﬁguration Management Terminal Connection General Setup Management Terminal Setup ParametersMenu Function Selection Display Setup Setup Local Management Accessing Local Management Sehi Local Management Feature Selection Screen Local Management Using the Local Management Screens Community Name Table Screen Access Community Name Editing the Community Name Field Conﬁguration Screen IP Address Setting the IP Address Default GatewayPort Enable Override SubNet Mask Setting the Subnet Mask Setting the Default Gateway Using the Port Enable Override Exiting the Configuration Screen Trap Table Screen Traps Configuring the Trap TableSnmp Community Name Trap IP Address Exiting the Trap Table Screen Snmp Tools Screen Set OID PrependGet Get Next Step WalkRecall-OID Cycles Getting Individual OIDs Getting the Next OID Setting an OID Viewing Multiple OIDs Walking Through OIDs Stepping Through OIDsCycling Through OIDs Exiting the Snmp Tools Screen Device Statistics Screen Alignment Errors Errors ReceivedCRC Errors Port Admin. Status Update-Freq Enable PortDisable Port Port Seg. Status Using the Enable Port Command Selecting the Appropriate Module/Port Using the Disable Port Command Exiting the Device Statistics Screen Appendix a Twisted Pair Wiring Tables Twisted Pair Wiring Tables A-2 A-3 A-4 From Punch Down To RJ-45 Into Block Wallplate Ofﬁce 10BASE-TDrop Device A-6 A-7 SEHI-32/34 Punch Wall Plate Champ Down Block If Required Ethernet Device Figure A-1. Punch Down Block A-9 Spanish Power Supply CordGerman French