Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

Telnet to router through AUX port

i have configured my router to telnet through modem dialin but when i dials from my pc to router it give me garbage charcter in my hyperterminal. can any one help me that is this is problem with my router configuration or the cable connection with the router.

router AUX port --> ciscoconsole cable --> cisco 29-4043-01-->modem


Re: Telnet to router through AUX port

Hi, have you check your hyperterminal settings?.

Try the connection using at commands like at the next url:

Re: Telnet to router through AUX port

Hi Muhammaed

Based on the inputs from your post i feel its mere a baud rate configuration mismatch under line tty.

Can you post the config of the same ?



Re: Telnet to router through AUX port

Even though the AUX port is supposed to "auto-baud" (usually you need to hit the "Enter" key a couple times), some/many/most/all current modems will set the DTE speed (the console cable) to the DCE speed (the modem-to-modem link) ... and "auto-baud" doesn't always work.

Since the modems will (by default) connect at 56K (or the top speed), chances are that it will try to talk to your Cisco device at some baud above 9.6K, which it is probably expecting.

You can do one of a couple things:

Hard set the modems to a 9.6k DTE speed (and/or DCE speed, since you won't go faster then the slowest baud)


Experiment on the router to hard set the DTE speed to the baud set on the modem's serial port (frequently 115 kilobaud).

Check it out and get back to us.

Good Luck


New Member

Re: Telnet to router through AUX port

I have tried every thing but no success. Can you tell me the exect cable and connector which will connect to the AUX port and Modem DB 25.



Re: Telnet to router through AUX port


I suppose you are using a female DB-9 at one end and a RJ-45 connector at the other end. I am attaching a pin diagram for you.

--Pls rate all helpful posts--

CreatePlease login to create content