server. A system service, called a daemon. It is usually a user program that runs in the background, in user space, to provide a defined set of functions to the user who uses it through the command interface. Each time a user invokes it, the server provides a separate process for that user.
slew rate. Specifies the rate of change of a signal on a communication line.
SNMP. Simple Network Management Protocol. A protocol for remotely performing administrative functions on a device.
stop bit. A bit that delineates the end of a character in a data stream.
stty. A UNIX command for configuring terminal ports.