These Cables Allow You To Simulate A Serial Wan Connection Without Requiring A CSU/DSU Or Similar Device. Most Serial Cables Are Marked On The Connector If It’s The DTE OR DCE.Ĭonnecting The Serial Ports Of Two Routers Directly Using What Is Known As A DCE-To-DTE Crossover Cable. When Connecting Two Routers Together With A Serial Cable, One Of The Routers Needs To Host The DCE (Data Communications Equipment) Side Of The Cable, And The Other Will Host The DTE (Date Terminal Equipment) Side. Recall That A CSU/DSU Usually Handles The Clocking For A Synchronous Serial Interface. In A Real-Life Network, Your Serial Interfaces Will Almost Certainly Be Configured As DTE Interfaces. The Router Connected To The DCE End Of The Cable Will Need Its Serial Interface Configured As A DCE Device. DTE/DCE Cable To Directly Connect Two Cisco Router Serial Interfaces. And The Other Marked DCE, (Data Communication Equipment) Means That This Device Must Provide The Clocking On The Wire. Being DTE You Should Expect The Other End To Provide Clocking.
The Router Connected To The DCE Cable Must Provide Clocking. We Need To Select DTE Serial Cable In This Case. When A Router Directly Connect To A Data Network Such As A Service Provider WAN Link, The Router Is Referred To As Data Terminal Equipment, Or DTE. Thererfor, In Addition To Determining The Cable Type, You Need To Determine Whether You Need DATA TERMINAL EQUIPMENT (DTE) Or DATA CIRCUIT-TERMINATING EQUIPMENT (DCE) Connectors For Your WAN Equipment. In Some Cases Such As Back-To-Back Connection, Your Router Could Act As DCE, Instead Of DTE. What Specific Connector To Use Depends On Whether We Need EIA/TIA-232, EIA/TIA-449, V.35, X.21, Or EIA-530.
Whereas The Five-In-One Connector Connects To The DB-60 Port On A Serial WAN Interface Card (WIC) On The DTE (Your Router), The Specified Connector Plugs Into The Specific WIC On The DCE (Provider’s Modem Or CSU/DSU). When You Order The WAN Connection Cable, You Receive A Serial Transition Cable With A DB-60 Connector (Also Called Five-In-One Serial Connector) At One End And The Connector Appropriate For The Standards You Specify At The Other End. Some Of The Different Signaling Standards And Connectors That Might Be Found On DCE Equipment Include EIA/TIA-232, EIA/TIA-449, V.35, X.21, And EIA-530. Serial Ports On The Other End Of The WAN Connection Is Dependent On The Service Providers And The Type Of Their DCE Equipment. Serial Ports On Cisco Routers Use 60-Pin DB-60 Connector Or The Smaller “Smart-Serial” Connector For The Purpose Of WAN Connections. On The Contrary, Parallel Data Transmission Transmits Several Bits At A Time With Parallel Data Transmission. Serial Transmission Is A Method Of Data Transmission In Which Bits Of Data Are Transmitted Sequenctially Over A Single Channel. Some Routers Have Additional Ports Such As BD-9 Port For Token Ring Network And Isdn Basic Rate Interface (BRI) Port For Low Cost Dial-On-Demand Wan Connection, As Illustrated In The Following Picture.įor Communication, Wans Use Serial Transmission. THE FOLLOWING PICTURE SHOWS A ROUTER WITH THE MOST COMMON ROUTER INTERFACES: Ethernet AUI Port, SERIAL Port, CONSOLE Port And AUXILIARY Port. WAN INTERFACES (SERIAL, ISDN BRI): Are Made Through A Wan Interface On A Router To Service Provider To Distant Site Or To The Internet. MANAGEMENT PORTS (CONSOLE, AUXILARY): Provide A Text-Based Connection For The Configuration And Troubleshooting Of The Router.ģ. LAN INTERFACES (ETHERNET AUI, BD-9): Allow The Router To Connect To The Lan Media Through Ethernet Or Some Other LAN Technology Such As TOKEN RING OR ATM.Ģ. GENERALLY IN CISCO ROUTER HAVE THREE KINDS OF INTERFACES : 1.