HP 24S Guida Utente

HP EtherTwistHub and Hub PlusInstallation andReference Guide

Features (continued)Compatibility with the IEEE 802.3 Type 10Base-T standard and support for bothIEEE 802.3 and Ethernet protocols.A self-test for fau

RRegulatory statements, C-1 - C-4Remote management, 1-2Remote station address, 3-3REset command, 3-8RS-232-C console port, 1-1SSafety information, C-1

Regulatory InformationThe product described in this document complies with specific international regulations. See the documentsection entitled “Regu

Printed in U.S.A5090-2692 E0692

Included PartsHP EtherTwist Hub/12 (28684-60011)HP EtherTwist Hub Plus (28688-60011) orHP EtherTwist Hub Plus/48 (28699-60001)Accessories kit for the

Front of the HubStatus LEDs~Line On (green) is ON if the hub is receiving power.Activity (green) is ON when data is being transmitted. The frequency

Back of the HubStatus LEDsPower (green) is ON if the hub is receiving power.(This is the same as ~Line On on the front.)Activity (green) is ON when da

Port LEDs (green), one for each network port, are ON when the corresponding port isenabled and functioning normally. Ports can be enabled and disable

Auto-SegmentationThese hubs will automatically disable (auto-segment) a port if it experiences excessivecollisions (greater than 30 consecutive collis

Firmware Enhancements (HP 28688B and HP 28699AOnly)Hewlett-Packard continually tests and improves its products. When firmwareenhancements are made to

Network Address. The communication between the hub and the network managementstation requires that the hub be assigned a network address. If you are

Upgrading the HP 28684B to an HP 28688BTo add network management capabilities, the HP 28684B EtherTwist Hub/12 can beupgraded to an HP 28688B EtherTwi

2InstallationThis chapter describes how to install and configure the HP 28684B EtherTwist Hub/12, HP 28688B Hub Plus, and HP 28699A Hub Plus/48, and v

Copyright Hewlett-Packard Company 1992. All rights reserved.Hewlett-Packard Company makes no warranty of any kind with regard to this material, incl

1. Make sure the hub’s power cord is correct for your country’s ac power supply. Donot plug the power cord into the power supply until the hub is m

Mounting the HP 28684B EtherTwist Hub/12 and HP 28688B Hub PlusFor Rack or Cabinet Mounting:1. Using a Phillips or cross-head screwdriver, attach th

For Wall Mounting: Using a Phillips or cross-head screwdriver, attach the mountingbrackets to the hub with 10-mm M4 screws (included in the accessorie

Mounting the HP 28699A Hub Plus/48For Rack or Cabinet Mounting:1. Using a Phillips (cross-head) screwdriver, attach the mounting brackets to the hub

For Wall Mounting: Using a Phillips (cross-head) screwdriver, attach the mountingbrackets to the hub with 10-mm M4 screws, included in the accessories

1. Plug the power cord into the hub’s power socket and into an ac power source. Notethat the hub does not have a power switch; the hub is powered o

Use the network ports (twisted-pair, AUI, and ThinLAN) to connect to computers, otherhubs or other network devices, or to a network backbone. Some ex

Connecting Other HubsYou can connect the hub to another HP EtherTwist twisted-pair hub using any of thenetwork ports. Some examples are shown below.

Port ConnectionsCautionDo not touch the connector pins of connectors or cables. Static dischargemay damage equipment.Twisted-Pair PortUsing a 12-port

Using a right-angle 50-pin connector: 1. Loosen the Velcro strap to makeroom for the 50-pin connector.2. Slip the connector inside the strapand pl

HP 28684B Hub/12HP 28688B Hub PlusHP 28699A Hub Plus/48HP EtherTwist Hub and Hub PlusInstallation and Reference GuideHP Part Number: 5090-2692Printed

ThinLAN Port1. Attach a thin LAN cable section to one side of a BNC “T” connector.2. Attach another thin LAN cable section or a 50-ohm terminator

AUI PortCautionDo not touch the hub connector pins or the cable connector pins. Staticdischarge may damage the equipment.1. Disable the SQE Test (si

No changes to the hub’s default configuration are required for the hub to operate correctly.The hubs each have a console interface for customizing the

Connecting a Modem and Terminal1. Use a full-duplex, asynchronous (character-mode) modem only. The followingmodems have been tested at their rated

If You Have Trouble with a Terminal or Modem ConnectionIf you have connected a terminal or modem according to the previous instructions and youdo not

Configuration CommandsSeveral of the console commands allow you to customize the operation of your hub. Theyare listed and described here.Command Nam

3OperationThe HP 28684B EtherTwist Hub/12, HP 28688B Hub Plus, and HP 28699A Hub Plus/48are designed to operate unattended. A console interface is pr

Console Commands HP 28699A; console commandsEnter at least the first two letters of a command to execute it, such as HE for the Helpcommand. The Help

BAckup (HP 28688B and HP 28699A Only)To configure one of the hub’s ports for dedicated use in a backup (redundant)link to another hub.The HP EtherTwis

What Is In This GuideThis guide contains information to help you install, configure, and troubleshoot your HP 28684B EtherTwist Hub/12, HP 28688B Ethe

COuntersTo display counters for each port, the global count for all ports, and the timeelapsed since they were last reset with the Reset command.Total

IPconfig (HP 28688B and HP 28699A Only)To set IP configuration parameters on the hub. Use this command if you wish thehub to be accessible using IP (

IP Address The IP address of the hub, written in the format X.X.X.X.Each number between the decimal points is a decimal numberbetween 0 and 255. Ever

LInkbeat <port> <ON/OFF>To enable (set to ON) or disable (set to OFF) link beat on a port. The defaultsetting is enabled (ON). Disable l

POrt <port> <ON/OFF>To enable (set to ON) or disable (set to OFF) a hub port. The initial setting for allports is enabled (ON). To simpl

STatus <port group>To display status information for the hub, including the time elapsed since thelast reset (see the Reset command), the hub’s

TEstlinkTo run a test of the link between the hub and another IEEE 802.3 device.NoteThe destination device must be able to send an IEEE 802.2 Test res

4TroubleshootingSome of the hub console commands are used for the troubleshooting instructions in thischapter. See “Console Connection” in chapter 2

Basic Troubleshooting Tips (continued)If the ThinLAN port is not being used, make sure that Thinwatch is disabled.(If Thinwatch is enabled on an unuse

Diagnosing With the LEDsLED patterns indicating problemsDiagnostic TipsPower Collision Fault PortOFF * * *Check power cord and power source. If OK,re

Contents1 Introducing the HP EtherTwist Hub/12, Hub Plus, and Hub Plus/48Features . . . . . . . . . . . . . . . . . . . . . . .

Diagnostic TestsTesting the Hub OnlyChoose one of the following procedures to test the hub’s internal circuitry. The first is themost complete interna

Testing the Hub’s Ports and the LinksTo test the hub’s ports and the attached network links, choose one of the following ways torun a test between th

ACables and ConnectorsThis appendix lists cables that have been tested and verified for use with the HPEtherTwist Hubs. It also includes minimum pin-

HP CablesCableFunctionCable TypePort TypeonTerminal,PC,or ModemHP Product NumberConnecting to the network:Connecting hub-to-hub Twisted-pair“crossover

Other Standard Cables Cable FunctionPort TypeonTerminal,PC,or ModemStandard Cable orCable SolutionConnecting to the console port:Connect aterminal or

Twisted-Pair Cable/Connector Pin-OutsTwisted-Pair Cable for Hub-to-Computer ConnectionTo connect PCs or other network devices to the hub, use a “strai

Twisted-Pair “Crossover” Cable for Hub-to-Hub ConnectionFor wiring between two hubs, the transmit and receive pairs must be reversed. Thetwisted-pair

Twisted-Pair Cable Pin AssignmentsTwisted-Pair Straight-Through CableHub EndComputer orTransceiver EndSignal Pins Pins Signal(receive +)(receive –)(t

AUI CableMinimum Pin-OutTransceiverend15-pin femaleHub end15-pin maleSignal 234569101213234569101213Control In circuit AData Out circui

3 OperationStarting the Console Session . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1Console CommandsHP 2869

Console Connector and Cable Pin-OutsThe HP EtherTwist Hubs have a console port that automatically detects whether aterminal or a modem is connected.

RS-232-C “Crossover” Cable(for Terminal/PC with 25-Pin Connector)Minimum Pin-OutTerminal/PCend25-pin maleHub end25-pin maleTx 2 2 TxRx 3 3 RxGND 7 7 G

RS-232-C Cable for HP 110Minimum Pin-OutHP110 end9-pin maleHub end25-pin maleTx 2 2 TxRx 3 3 RxGND 7 7 GND5 CTS6DSR8 DCD22 RI23 DRSNull-Modem Adapter(

RS-232-C Modem CableMinimum Pin-OutModem end25-pin maleHub end25-pin maleSignal22Tx33Rx44RTS55CTS66DSR77GND8 8 CD OR DCD20 20 DTR22 22 RI23 23 DRS – t

BSpecificationsHP 28684B Hub/12 and HP 28688B Hub PlusPhysicalDimensions: 42.5 cm by 23.5 cm by 4.4 cm(16.8 in by 9.3 in by 1.7 in)Weight: 2.7 kg (6.0

Cable InterfacesThe 50-pin twisted-pair port is compatible with the IEEE 802.3 Type 10Base-Tstandard.The ThinLAN port is compatible with the IEEE 802.

HP 28699A Hub Plus/48PhysicalDimensions:42.5 cm by 23.5 cm by 8.9 cm(16.8 in by 9.3 in by 3.5 in)Weight: 3.8 kg (8.8 lb)Electrical(The HP 28699A hub a

ElectromagneticEmissions*FCC part 15 Class A CISPR-22 Class A*EN 55022 Class A*VCCI Class I(in US, Canada, and Latic America)(in Europe)(in Japan)Imm

CModem ConfigurationHP 35031A Support Link IIAt the hubend:Configure SOFT OPTION 6 to 1.Configure SOFT OPTION 15 to 2.Configure SOFT OPTION 16 to 2.Co

Console Connector and Cable Pin-Outs . . . . . . . . . . . . . . . . . . . . . . A-8Pin-Out for Hub’s Console Port Connector .

Black Box V.32 9600 Async.At the hubend:Load the factory option set #1. Then make these changes:–––Data Rate Menu: change to 9600 uncodedModem Param

DNetwork Addressing (HP 28688B and HP 28699A Only)The HP 28688B EtherTwist Hub Plus and the HP 28699A Hub Plus/48 can be managedover the network by HP

IPX Addressing Notes:Because the IPX address is assigned automatically, no IPX configuration isnecessary; no IPX configuration is provided on the hub

Building Your Own IP Addressing SchemeIf your network is isolated and will not be connected to any other networks that use IPaddressing, you can build

The IP address format is X.X.X.X, where each X is an integer between 1 and 255. Theintegers are separated by decimal points. For a given network wit

EBackup Links (HP 28688B and HP 28699AOnly)DescriptionIn some network configurations a critical link exists, for example between two workgroupsthat re

LimitationsEach hub can monitor a single backup link (only one backup link can beconfigured on each hub). But, the hub may be at the remote end of on

Configuring a Backup LinkConfigure the Monitoring Hub Only. All configuration of the backup link isperformed from the console on the hub that is respo

Identifying the Backup LinkThe ports designated as the primary and backup ports are identified on the hub console’sStatus command screen by the words

Reactivating the Primary LinkWhen the primary link is repaired, you can use any of the following methods to reenablethe primary port:From the hub’s co

E Backup Links (HP 28688B and HP 28699A Only)Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Sample TopologiesFollowing are two simple sample topologies that may give you some ideas on how a backuplink could be used in your network.Sample 1: E

Sample 2: Backup Link Using Alternative MediumIn this topology, the primary link consists of a twisted-pair cable between twisted-pairports on a Hub P

Safety InformationSafety SymbolsDocumentation reference symbol. If the product is marked with this symbol, refer to theproduct documentation to get m

Informations concernant la sécuritéSymboles de sécuritéSymbole de référence à la documentation. Si le produit est marqué de ce symbole,reportez-vous

Hinweise zur SicherheitSicherheitssymboleSymbol für Dokumentationsverweis. Wenn das Produkt mit diesem Symbol markiert ist,schlagen Sie bitte in der P

Considerazioni sulla sicurezzaSimboli di sicurezzaSimbolo di riferimento alla documentazione. Se il prodotto è contrassegnato da questosimbolo, fare

Consideraciones sobre seguridadSímbolos de seguridadSímbolo de referencia a la documentación. Si el producto va marcado con estesímbolo, consultar la

Safety Information6 Safety Information

Regulatory StatementsFCC Statement (For U.S.A. Only)Federal Communications Commission Radio Frequency Interference StatementWarning: This equipment g

1Introducing the HP EtherTwist Hub/12,Hub Plus, and Hub Plus/48The HP 28684B EtherTwist Hub/12, HP 28688B EtherTwist Hub Plus, and HP 28699AEtherTwist

Declaration ofConformityThe following Declarations of Conformity for the HP 28684B, HP 28688B, and HP 29699A comply with ISO/IEC Guide 22 andEN 45014.

Regulatory Statements 3

4 Regulatory Statements

One-Year Limited Hardware WarrantyHewlett-Packard warrants this computer hardware product against defects in materialsand workmanship for a period of

HP has conducted limited testing with certain non-HP products to determine compatibilitywith the hubs. Please contact your HP authorized LAN dealer o

IndexAAccessories kit, 1-3Alignment errors, 3-4AUI ports, 1-1, 2-9Auto-segmentation, 1-2, 1-7BBAckup command, 3-3Backup default router, 3-6Backup link

COunters command, 3-4CRC errors, 3-4DDeclaration of conformity, C-2Diagnosing with the LEDs, 4-3Diagnostic tests, 4-4EEcho request packet, 1-2electrom

firmware enhancements, 1-2, 1-8how it works, 1-6included parts, 1-3installation, 2-1mounting, 2-1network address, 1-9operation, 3-1ports, 1-1power cor

troubleshooting, 4-1HP 28699Aaccessories kit, 1-3backup links, E-1cable interfaces, B-3cables and connectors, A-1configuration commands, 2-17connectin

LLEDs, 1-2LEDs, diagnosing with, 4-3LEDs, status, 1-4Link beat, 1-7Linkbeat command, 3-7MMAC address, 3-5Modems, C-1Mounting brackets, 1-3Mounting the