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Home > Archive > CCNA > October 2003 > serial ports on routers
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serial ports on routers
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| jaymaine 2003-10-08, 7:59 pm |
| Hey all
I did a search on the forums for this question and couldn't seem to find an answer so I guess I'll have to ask it.. I think it's very basic..
I know in a lab environment you can connect two routers together with a serial cable. But my question is, what is the purpose of doing that? What I mean is, in a real world network what would the serial port be connected to? Know what I'm getting at? In my CCNA books this isn't really explained in much detail, unless I missed something. My thought was that this is where, as an example, the t1 or t3 would somehow connect to provide the bandwidth. Am I way off?  lol, thanks in advance for any words of wisdom.
Jay | |
| OHCCNP2003 2003-10-08, 10:30 pm |
| You are on the right track. For a T1 you would connect to a CSU/DSU or TSU that can provide the clocking for the interface. When you directly connect 2 routers you need to provide the clock rate since routers are DTE devices, not DCE.
As an example, I just installed a 3661 router for one of my clients. The 3661 is connected to a T1 via an Adtran TSU 100e, and has six serial ports connected to V.35 comm ports on an IBM AS/400. Each of the remote sites has a TSU 100e and a 2621 router that connects to a remote controller to support dumb terminals and printers. Communication is via frame relay using STUN - serial tunneling. |
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