Cabletron Systems SEHI-22, SEHI-32, SEHI-24 manual JAM Output, Fragment Extension, Fault Protection

Page 32

INSTALLATION REQUIREMENTS/SPECIFICATIONS

JAM Output:

Collisions are propagated

 

through the network using the

 

JAM signal of an alternating

 

pattern of 1's and 0's in

 

accordance with 802.3

 

specifications for a repeater unit.

Fragment Extension:

Packet fragments are extended to

 

a minimum of 96 bits using the

 

JAM [1,0].

Fault Protection:

Each segment will disconnect

 

itself from the other segments if

 

32 consecutive collisions occur, or

 

if the collision detector of a

 

segment is on for longer than

 

approximately 110 ∝s. This fault

 

protection will reset

 

automatically after one packet is

 

transmitted/received onto the

 

fault protected segment without

 

causing a collision.

POWER SUPPLY REQUIREMENTS

Note: The SEHI has a universal power supply. This unit allows you to use an input power from 90 to 264 VAC, 47-63 Hz.

The power supply has two outputs of +5 volts and +12 volts. The maximum output power is 40 watts and the minimum efficiency is 65% under all conditions of line at full load. The minimum and maximum load current from each output is shown below.

Output

Min. Load

Max. Load

Max Power

+5 Volts

0.75 Amps

4 Amps

20 Watts

+12 Volts

0.00 Amps

2 Amps

24 Watts

Page 2-18

Image 32
Contents 10BASE-T Intelligent Stackable HUB USER’S Guide Printed On Recycled Paper FCC Notice DOC NoticeCabletron SYSTEMS, INC Program License Agreement Cabletron Software Program LicenseExclusion of Warranty Disclaimer of Liability United States Government Restricted RightsTable of Contents Installation Connecting to the NetworkTroubleshooting Local ManagementContents Appendix B Twisted Pair Wiring Tables A-1 Using this Manual Chapter IntroductionIntroduction Getting Help Sehi OverviewSehi Features Repeater FunctionalityPolarity Detection and Correction Flash EEPROMsReset Button Lanview LEDsLocal Management Stackable CapabilitiesIntroduction Optional Features EpimRelated Manuals Daughter Board Upgrade KitRack Mount or Wall Mount Hardware Cable Specifications HubSTACK Interconnect Cable RequirementsLength Insertion LossImpedance JitterDelay TemperatureCrosstalk NoiseFiber Optic Budget and Propagation Delay Cable Type Attenuation Maximum Cable LengthInstallation REQUIREMENTS/SPECIFICATIONS Connectors Thin-Net Network Requirements for the EPIM-C ModuleCable Type TerminatorsAUI Cable Network Port SpecificationsAUI Cable Requirements for the EPIM-A and EPIM-X Modules SEHI-22 and SEHI-24 Network Port Specifications SEHI-32 and SEHI-34 Network Port SpecificationsPin Champ Connector Installation REQUIREMENTS/SPECIFICATIONS Epim Specifications EPIM-TEPIM-F1 and EPIM-F2 Parameter Typical Worst Worst Case Typical Value BudgetEPIM-F3 EPIM-F3Parameter Typical Minimum Maximum Connector Type EPIM-CEPIM-A and EPIM-X AUI Port EPIM-A and EPIM-XCOM Transceiver RequirementsDelay Times Start of Packets Delay Times JAMGeneral PreambleFault Protection Power Supply RequirementsOutput Min. Load Max. Load Max Power JAM OutputSafety PhysicalInstalling the Sehi Unpacking the SehiStacking the Sehi Stacking the Sehi Attaching the Strain Relief Bracket Disconnect SEH and Sehi Interconnect Cables At the OUT PortInstalling the Sehi in the Rack Rack Mounting the SehiWall Mounting the Sehi Free-Standing Installation Shelf or Table-top InstallationInstallation Connecting the Sehi to the Power Source Connecting the Sehi to the Network Connecting to Network Ports, SEHI-22 and SEHI-24EPIM-2 Connecting to Network Ports, SEHI-32 and SEHI-34 Connecting a UTP Segment to an EPIM-T EPIM-T Cross-over SwitchConnecting 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-AConnecting an AUI Cable to an EPIM-X Finishing the Installation On Position Toward Back Epim OFF Position Toward FrontChapter Troubleshooting Installation CHECK-OUTUsing Lanview PWR CPUTroubleshooting CLN Using the Reset ButtonRCV LNKChapter Local Management Local Management Management Terminal Requirements Console Cable Configuration Management Terminal ConnectionManagement Terminal Setup Parameters Menu Function Selection Display SetupGeneral Setup SetupLocal Management Accessing Local Management Sehi Local ManagementFeature Selection Screen Local Management Using the Local Management Screens Community Name Table ScreenAccess Community NameEditing the Community Name Field Configuration Screen IP AddressDefault Gateway Port Enable OverrideSetting the IP Address SubNet MaskSetting the Subnet Mask Setting the Default Gateway Using the Port Enable OverrideExiting the Configuration Screen Trap Table ScreenConfiguring the Trap Table Snmp Community NameTraps Trap IP AddressExiting the Trap Table Screen Snmp Tools ScreenOID Prepend GetSet Get NextWalk Recall-OIDStep CyclesGetting Individual OIDs Getting the Next OIDSetting an OID Viewing Multiple OIDsCycling Through OIDs Walking Through OIDsStepping Through OIDs Exiting the Snmp Tools Screen Device Statistics ScreenErrors Received CRC ErrorsAlignment Errors Port Admin. StatusEnable Port Disable PortUpdate-Freq Port Seg. StatusUsing the Enable Port Command Selecting the Appropriate Module/PortUsing the Disable Port Command Exiting the Device Statistics ScreenAppendix a Twisted Pair Wiring Tables Twisted Pair Wiring TablesA-2 A-3 A-4 Drop Device From Punch Down To RJ-45 Into Block Wallplate Office10BASE-T A-6 A-7 SEHI-32/34 Punch Wall Plate Champ Down Block If Required Ethernet DeviceFigure A-1. Punch Down Block A-9 Power Supply Cord GermanSpanish French