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# Chapter 26 Serial Communications

# 26.1 Synopsis

UNIX® has always had support for serial communications. In fact, the very first UNIX machines relied on serial lines for user input and output. Things have changed a lot from the days when the average “terminal” consisted of a 10-character-per-second serial printer and a keyboard. This chapter will cover some of the ways in which FreeBSD uses serial communications.

After reading this chapter, you will know:

- How to connect terminals to your FreeBSD system.

- How to use a modem to dial out to remote hosts.

- How to allow remote users to login to your system with a modem.

- How to boot your system from a serial console.

Before reading this chapter, you should:

- Know how to configure and install a new kernel (Chapter 8).

- Understand UNIX permissions and processes (Chapter 3).

- Have access to the technical manual for the serial hardware (modem or multi-port card) that you would like to use with FreeBSD.

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