T
Touchtone Dialing
W
Wait for Dialtone
A/
Repeat Command
+++
Escape
Appendix D: Glossary
ASCII -
An acronym for American Standard Code for Information Exchange. ASCII is a seven-bit
code which defines 128 standard characters, including control characters, letters, numbers, and
symbols. An extra 128 characters comprise the extended ASCII set.
Baud Rate -
The transmission rate between two serial devices, e.g., modems, fax machines, etc.
Measured in Bits Per Second.
Blind Dialing -
In blind dialing, the modem continues to dial, regardless of the existence of a
dialtone, ring, or busy signal.
BPS -
Bits Per Second; the number of bits that can be transmitted in one second.
Carrier Signal -
The analog data signal that a modem sends over telephphone wires.
COMx -
Where (x = 1, 2, 3, or 4), COMx is the name(address) of serial communications ports on
personal computers. Each serial port in a personal computer has a different number.
CTS -
Clear To Send.
Default -
The assumed value that is used for a command parameter when no other value is explicitly
provided.
DCD -
Data Carrier Detect.
DCE -
Data Communication Equipment.
DTE -
Data Terminal Equipment.
DTMF -
Dual Tone Multi-Frequency (for touchtone dialing).
DTR -
Data Terminal Ready.
FSK -
Frequency Shift Keying.
Make/Break Ratio -
The ratio of the off-hook (make) to on-hook (break) interval is the make/break
ratio in pulse dialing.
Modem -
A combination of the words MOdulator and DEModulator. Modems transform digital data
into analog signals and back again.
Nonvolatile Memory -
An area of memory inside the modem where the default configuration
profile is stored. Values recorded in this memory will not be lost when the power is turned off.
Off-Hook -
The condition when the modem has picked up the telephone line.
Off-Line Command State -
A modem state in which the modem accepts, interprets and executes
commands from an asynchronous computer or terminal.
