3Com 5000 manual Attributes of the synchronous/asynchronous serial interface

Page 33

 

 

Router to WAN Connection 33

Table 15 Attributes of the synchronous/asynchronous serial interface

 

 

 

 

Description

 

 

 

 

Attribute

Synchronous

 

Asynchronous

 

 

 

 

Function

DDN leased line backup

 

Modem dial-up

 

Terminal access

 

Backup

 

 

 

Asynchronous

 

 

 

lease line

 

 

 

terminal access

 

 

 

 

Protocol

PPP

 

PPP

 

MP

 

SLIP

 

LAPB

 

MP

 

HDLC

 

 

 

X.25

 

 

 

Frame Relay

 

 

 

 

 

 

Synchronous/asynchronous mode

Synchronous/Asynchronous serial interface can work in either synchronous or asynchronous mode. Different signalling standards are supported in these two modes. V.35 and V.24 (RS232) support synchronous operating mode, while V.24 (RS232), support the asynchronous operating mode. The maximum transmission distance and baud rate of the signal vary with the operating mode.

Table 16 Transmission rate and distance of V.24 (RS232)/V.35 cable

V.24 (RS232)

 

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

56000

60

 

 

 

 

115200

10

64000

50

 

 

 

 

-

-

2048000

30

 

 

 

 

Image 33
Contents 3Com Router 5000 Family 3Com Corporation Campus Drive Marlborough Page Page Contents Register Your Product to Gain Service Benefits Introduction Software Maintenance under v 3.11 EnvironmentContents Contents About This Guide Conventions RelatedDocumentation Pddtechpubscomments@3com.com CommentsAbout This Guide Router AboutEthernet access solution By extending SICs and MIMs, 3C13701 3Com RouterRouter 5012 Indicators System DescriptionSystem description of 3Com Router SLOT1~3 READY/ACTIVE 3C13751Ready LEDs of 3Com 5232 RouterNvram Router 5642 Indicators 3C137553Com Router 5642 Front view of 3Com Router Router 5642 Indicators 3Com Router 5682 Front view of 3Com Router 3C13759Router 5682 Indicators Introducing the Router 5000 Family Installing Installing the Router on a WorkbenchRouter in a Rack Standard rack, as shown in FigurePgnd Wire Power Cords Grounds and CablesAC Power Cord AC power supply Power CordAC Power Connector Recommended power outletConsole Terminal Introduction to console port Console cableAttributes of the console port Introduction to the Ethernet interface Router to LAN ConnectionEthernet cable Attributes of the Ethernet interfaceConnection Router to WANIntroduction to the AUX port AUX cableAttributes of the synchronous/asynchronous serial interface WAN Interface toTransmission rate and distance of V.24 RS232/V.35 cable Attributes of the synchronous/asynchronous serial interfaceDTE and DCE DTE cable assembly 24 RS232 DCE cable assembly35 DCE cable assembly 35 DTE cable assembly21 DTE cable assembly V24 DTE cable assembly 35 DCE cable assembly 75Ω unbalanced coax cable E1 interface to DSU/CSU120Ω balanced twisted pair cable E1 interface attributesE1 120Ω balanced twisted pair cable T1interface attributes T1 interface to DSU/CSUConnecting the router to a console terminal Setting up Configuration EnvironmentSetting the parameters for console terminal Startup RouterSetting the connection port in the local configuration Powering on the router Checking before power-onChecking/operating after power-on Press Enter and the screen will display Characteristics of the command line interface ConfigurationFundamentals Router InterfaceCommand line interface Starting and Configuring the Router Power System TroubleshootingTroubleshooting of nothing being displayed on the terminal ConsoleSdram Troubleshooting of repeated rebootApplication Software UpgradeTroubleshooting Introduction Configuration fileRouter manages three types of files Application image file main softwareBoot Menu Maintenance underSoftware EnvironmentDefault names and types of the boot files =MAIN B=BACKUP S=SECURE Flag set successfully Upgrading the application image Upgrading Software through XmodemDownload completed Upgrading the entire Boot ROM image Upgrading the application image through Ethernet Router Software Maintenance Software Maintenance under v 3.11 Environment Password loss. They can help you to set a new password Router PasswordDealing with a LossSolve Problems Online Service BenefitsRegister Your Product to GainServices WarrantyAccess Software Purchase ExtendedContact Us Telephone TechnicalSupport and Repair Country Telephone Number US and Canada Telephone Technical Support and Repair Appendix a Obtaining Support for Your 3COM Products
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