How to access a server via serial port?

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http://serverfault.com – I have some troubles with my server! After I asked for support, I get the following answer: You can use the serial port to reset your network configuration. I have a client machine with Ubuntu Oneiric Ocelot (11.10) installed on it and a cable for serial access with 9 pins in a head and a network connector in the other. Can anyone give me some hints on how can I access my server via serial port? I beg your pardon if I'm not clear in my question, but I'm very new on this topic. If you need explanations, just let me know! Thanks. (HowTos)