HP 5000 Router manual Serial Interface Cable Synchronous and Asynchronous Mode, DTE and DCE Mode

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50APPENDIX A: CABLE SPECIFICATIONS

Serial Interface Cable Synchronous and Asynchronous Mode

V.35 and V.24 (EIA/TIA-232) standards support synchronous operating mode. V.24 (EIA/TIA-232) also supports the asynchronous operating mode. The maximum transmission distance and baud rate of the signal vary with the operating mode.

Table 20 Transmission Rate and Transmission Distance of V.24 (EIA/TIA-232)/V.35 Cable

V.24 (EIA/TIA-232)			V.35
	Maximum		Maximum
	transmission		transmission
Baud rate (bps)	distance (m)	Baud rate (bps)	distance (m)

2400	60	2400	1250
4800	60	4800	625
9600	30	9600	312
19200	30	19200	156
38400	20	38400	78
64000	20	54000	60
115200	10	64000	50
-	-	2048000	30

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

DTE and DCE Mode

The synchronous serial interface can operate in both DTE and DCE modes. For two devices connected directly, one device should operate in DTE mode, and the other device should operate in DCE mode. The DCE device provides a synchronous clock and specifies the transmission rate, the DTE device accepts the synchronous clock and communicates at the specified transmission rate. Usually, the router serves as the DTE device. To determine whether the device is a DTE or a DCE, refer to the user manual for the device.

Table 21 Typical DTE and DCE

Type of Equipment	Type of Interface	Typical Equipment

DTE	male	PC or router
DCE	female	Modem, multiplexer or
		CSU/DSU

The asynchronous serial interface generally is connected to a modem or a terminal adapter (TA) to act as the dial-up interface. You do not need to determine if the device is DTE or DCE, you must only select the appropriate baud rate.

The synchronous/asynchronous serial port cable is connected to a DB-50 receptacle. Proper connection cable needs to be selected for the protocol applied.

Four types of synchronous/asynchronous serial port cables are available. However, these cables are optional and you must select the proper one based on your requirements when you purchase the router All these types of cables have a DB-50 adapter at one end.

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Contents Router 5000 Family Installation Guide 3Com Corporation Campus DriveMarlborough, MA 01752-3064Contents Troubleshooting About this Guide ConventionsProtocols that are used to interconnect WANs List conventions that are used throughout this guideRelated DocumentationIntroducing the Router Family Router 5000 Family Console Port Specifications Router 5000 FamilyHardware Fixed portsGround Lists the attributes of the Router 5000 Family AUX portLEDs Table below describes the LEDs on the Router Describes the LEDs on the Router 5232, 5642, 5682 routers Router 5232, 5642, 5682 LEDsSystem Specifications for the Router Front View of the RouterSynchronous/Asynchronous Serial Port Specifications Description Attribute Synchronous AsynchronousRouter 5232 specifications Router 5642 specificationsRouter 5682 specifications System Specifications for the Router Introducing the Router 5000 Family Installing the Router Temperature and Humidity Specification for Dust ContentDust GasesElectromagnetic Discharge Lightning DamageMounting the Router A RackInstalling the Router Connecting the PowerConnecting the Router On the WorkbenchInstalling SICs and MIMs To the Ethernet That uses category-5 twisted pair cableFixed Ethernet cables are supplied with the router Use shielded cables to ensure electromagnetic compatibilityConnecting the AUX Port to the Analog Modem Port to a CSU/DSUVerifying Installing the Router Booting and Configuring Router Connecting the Router to a Remote Console TerminalConnector to the serial port of a PC, as shown below To a Local ConsoleSetting Parameters Console TerminalTo set terminal parameters Shown belowSet the following parameters Bits per second 9600 Data bits Parity None Stop bitsHyperTerminal Window Powering on Router Connect Dialog BoxStartup Process ConfigurationFundamentals Router Configuration Fundamentals of the Router Naming and Arranging Interfaces Ethernet Serial synchronous/asynchronous Asynchronous E1/T1Maintaining the Router Boot Menu Boot MenuIntroduction Through XModem Options of Boot ROM operation menu includeUpgrading application program Send File dialog box Upgrading the entire Boot ROM program Restoring the Extended Segment of Boot ROM ProgramRestore the extended segment of Boot ROM program from Flash Upgrading the extendedIntroduction Press Enter to reboot the system Router restarts after successful upgradingBuild up FTP local upload/download environment Build up FTP remote upload/download environmentSpecify FTP directory Add right levelStart FTP server Ftpquit Cover Power LED is Off TroubleshootingNothing is Displayed on the Terminal after Power-On Power-On Repeated RebootIllegible Characters Display onAfter Startup, All LEDs Remain On RUN LED Remains OnRUN LED Blinks Rapidly During Sartup RUN LED Blinks Slowly After StartupTroubleshooting Cable Specifications Signal Direction DB-25 DB-9Console Cable Console Cable PinoutsAUX Cable Ethernet CableSignal Category Signal Direction Signal Twisted Pair Signal DirectionStraight-through Network Cable Pinouts Crossover Network Cable PinoutsSerial Interface Cable Synchronous and Asynchronous Mode DTE and DCE ModeTypical DTE and DCE EIA/TIA-232 Maximum Transmission Baud rate bps Distance mDB-50 Signal Signal Direction DB-25 PinoutsDescribes the V.24 DTE cable pinouts 24 DTE Cable PinoutsDCE Cable illustrates the V.24 DCE cable assembly Assembly and PinoutsDescribes the V.24 DCE cable pinouts 24 DCE Cable PinoutsDescribes the V.35 DTE cable pinouts DB-50 Signal Signal Direction35 DTE Cable Pinouts DCE Cable illustrates the V.35 DCE cable assembly Describes V.35 DCE cable pinouts 35 DCE cable PinoutsDumb Terminal Adapter E1 CableT1 Cable Describes T1 cable pinoutsIsdn cables Pin 4 and pin 5 are the receiving endProduct Warranty, you can obtain an RMA number online at Password Contact UsNumber, URL or e-mail address from the list below Support telephone numbers posted on the 3Com web site atLatin America Telephone Technical Support and Repair US and Canada Telephone Technical Support and RepairAppendix a Obtaining Support for Your Product