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XON/XOFF
A handshaking, flow control mechanism that communicates that the device
is ready to accept more data. The flow control embedded into the data
stream by using special characters with hence transmit on (XON), or
transmit off (XOFF) often referred to as software flow control.
CTS/RTS
CTS stands for Clear To Send. RTS stands for Request To Send, a
handshake line in which the computer tells the modem it can accept new
data.
DCD
Data Carrier Detect
DSR
Data Set Ready. Supplied by the modem to indicate it has power and is
ready to accept commands.
DTR
Data Terminal Ready. Signal generated by the computer to indicate it can
accept data from the modem.
DUPLEX
A communication system that is capable of communicating in both
directions can be half duplex or full duplex. Half duplex allows
communication in both directions, but only one direction at a time, while
full duplex allows data to transmitted in two directions simultaneously.
OFF-HOOK
Pick-up a telephone receiver. You take the modem off hook to dial or
answer and it remains off hook while you are connected.
ON-HOOK
Hangs up a telephone receiver. You are not connected to Telephone Central
Office when the modem is on hook.