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3Com 5000 manual DTE and DCE

Models: 5000

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34Chapter 2: Installation

CAUTION: The baud rate should not exceed 64kbps when the V.24 cable operates in synchronous mode.

■DTE and DCE

Synchronous serial interface can operate in both DTE and DCE mode. For two devices connected directly, one should operate in DTE mode, and the other should operate in DCE mode. The device at the DCE side provides a synchronous clock and specifies the transmission rate, while the device at the DTE side accepts the synchronous clock and communicates at the specified baud rate. Usually, the router serves as a DTE device. To determine whether the device connected to the router is a DTE or DCE, please refer to the manual that came with the device. Also the following table will be helpful in identifying DTE and DCE. Usually, the PC or Router serves as a DTE device and the Modem, Multiplexer or CSU/DSU serves as a DCE device.

In general, the asynchronous serial interface is connected to an external Modem or a Terminal Adapter (TA) to work as the dial-up interface. In this case, it is unnecessary to determine whether the device is DTE or DCE, and just choose an appropriate baud rate.

Synchronous/asynchronous serial interface cable The WAN interface of the router is a DB50 receptacle. Proper connection cable needs to be selected for the protocol applied. By far, nine types of synchronous/asynchronous serial interface cables are available. One end of all the nine types of cables is DB50 connector, the other end (network end) varies with the cable type, which can be:

■V.24 (RS232) DTE cable: DB25 (male) connector

■V.24 (RS232) DCE cable: DB25 (female) connector

■V.35 DTE cable: 34PIN (male) connector

■V.35 DCE cable: 34PIN (female) connector

■X.21 DTE cable: DB15 (male) connector

■X.21 DCE cable: DB15 (female) connector

The following figures show the cable assembly of all these types:

■V.24 (RS232) DTE cable assembly

Image 34

3Com 5000 manual DTE and DCE

Contents

3Com Router 5000 Family Getting Started GuideENVIRONMENTAL STATEMENT 3Com Corporation 350 Campus Drive Marlborough MAUNITED STATES GOVERNMENT LEGEND End of Life StatementDownload the latest software and documentation for your 3Com Router Page Download the latest software and documentation for your 3Com Router ContentsContents About This Guide 1 Introducing the Router 5000 FamilyTroubleshooting 2 Installation3 Starting and Configuring the Router Router Software MaintenanceAccess Software Downloads Contact Us Solve Problems OnlinePurchase Extended Warranty and Professional Services Contents8 Contents About This Guide Conventions Router 5000/6000 Configuration GuideRouter 5000/6000 Command Reference Guide Relatednetwork supplier Commentspddtechpubscomments@3com.com Documentation12 About This Guide High-performance processor The Router 5000 uses About theRouter 1 Introducing the Router 5000 FamilyEthernet access solution By extending SICs and MIMs, the Figure 2 Rear view of 3Com Router 3Com Router3C13701 Figure 1 Front view of 3Com RouterTable 3 System description of 3Com Router System DescriptionTable 2 Router 5012 Indicators Indication3C13751 Boot ROM Stores Bootstrap program3Com Router Table 4 LEDs of 3Com 5232 Router Figure 4 Rear view of 3Com RouterIndication System Description Boot ROM Stores Bootstrap programTable 5 System description of 3Com Router 3Com Router 5642 Figure 5 Front view of 3Com Router 3C13755Table 6 Router 5642 Indicators Figure 6 Rear view of 3Com RouterTable 7 System description of 3Com Router Table 6 Router 5642 Indicators continuedSystem Description Indication3Com Router 5682 Figure 7 Front view of 3Com Router 3C13759Figure 8 Rear view of 3Com Router Table 9 System description of 3Com Router Table 8 Router 5682 IndicatorsSystem Description 3Com Router 5682 3C1375924 Chapter 1 Introducing the Router 5000 Family Installing the 2 InstallationInstalling the Router on a Workbench Router in a RackPower Cords Grounds and Cables PGND WireAC power supply Power CordAC Power Cord well grounded. Otherwise, the router cannot reliably avoid lightningRecommended power outlet Figure 11 AC Power ConnectorConsole Terminal Introduction to console port Console cableIntroduction to the Ethernet interface Router to LAN ConnectionEthernet cable Introduction to the AUX port Router to WANConnection AUX cableWAN Interface to DSU/CSU Introduction to the synchronous/asynchronous serial interfaceSynchronous/asynchronous mode DTE and DCE Figure 15 V.24 RS232 DTE cable assembly V.24 RS232 DCE cable assemblyV.35 DTE cable assembly Figure 16 V.24 RS232 DCE cable assemblyFigure 17 V.35 DTE cable assembly V.35 DCE cable assemblyX.21 DTE cable assembly Figure 18 V.35 DCE cable assemblyFigure 19 X.21 DTE cable assembly Figure 20 X.21 DCE cable assemblyFigure 23 V.35 DTE cable assembly Figure 21 V24 DTE cable assemblyFigure 22 V.24 DCE cable assembly 38 Chapter 2 InstallationFigure 25 X.21 DTE cable assembly Figure 24 V.35 DCE cable assemblyFigure 26 X.21 DCE cable assembly 120Ω balanced twisted pair cable E1 interface to DSU/CSU75Ω unbalanced coax cable AttributeFigure 28 E1 120Ω balanced twisted pair cable T1 interface cable and network connector assembly are optional T1 interface to DSU/CSUConnecting the router to a console terminal 3 Starting and Configuring the RouterSetting up Configuration Environment Setting the parameters for console terminal1 Select a connection port Checking before power-on Powering on the routerChecking/operating after power-on Press Enter and the screen will display Fundamentals of ConfigurationCharacteristics of the command line interface the RouterCommand line interface Configuration Fundamentals of the Router50 Chapter 3 Starting and Configuring the Router the Power System 4 TroubleshootingTroubleshooting Troubleshooting ofTroubleshooting of repeated reboot Troubleshooting of “displaying illegible characters on the terminal”SDRAM Software Upgrade ApplicationUpgrade the application software again after the problem is solved 5 Router Software Maintenance IntroductionBoot Menu Maintenance underextended and basic. You can separately upgrade and back up the SoftwareThe following table gives default names and types of the boot files 4 Display applications in Flash memory 6 Clear console authentication Upgrading Software through XMODEM Upgrading the application imageFigure 34 Send File dialog box CAUTION This upgrade approach upgrades only a portion of the Boot Upgrading the entire Boot ROM imageUpgrading the extended segment of the Boot ROM image ROM image, so you can make a second attempt once errors occurBackuping Boot ROM program to FLASH successed Upgrading the application image through EthernetBackup Extended Segment, are you sure?Y/N Restore Extended Segment, are you sure?Y/N64 Chapter 5 Router Software Maintenance 2 In Boot Menu, select 2 to enter Net Port Download Menu as followshost inet h IP address of TFTP Server flags f host inet h IP address of FTP Server Dealing with a Router Passwordpassword loss. They can help you to set a new password LossRegister Your Service BenefitsSolve Problems Online Product to GainAccess Software Warranty andServices Purchase ExtendedSupport and Repair Contact UsTelephone Technical http//csoweb4.3com.com/contactusCountry CountryTelephone Number Telephone NumberCountry CountryTelephone Number Telephone Number72 APPENDIX A OBTAINING SUPPORT FOR YOUR 3COM PRODUCTS