Paradyne 3830 manual Pbx

Glossary

modulation	The process of varying some characteristics
	(usually amplitude, frequency, and/or phase) of a
	carrier wave to form data transmissions.
off-hook	A telephone or modem is being used.
on-hook	A telephone or modem is not being used.
Originate mode	The modem is in a state where it is ready to
	transmit a call. In a dial network, it is the modem
	that makes the call. In a leased-line network, it is
	one of two sides of the network that is selected to
	be the originating modem.
parity	A way of checking data accuracy by counting the
	number of bits that have a value of one.
PBX	Telephone switching equipment (Private Branch
	Exchange) dedicated to one customer. A PBX
	connects private telephones to each other and to
	the public dial network.
permissive interface	A dial modem operating mode characterized by a
	fixed output power level of ±9 dBm. It is one of
	two possible modes of operation for modems
	connected to dial lines (see programmable
	interface).
power-up self-test	A test that checks most hardware components
	when the modem is powered-on.
programmable interface	A dial modem operating mode characterized by an
	output power level (±12 to 0 dBm) set by a
	programming resistor in the jack. It is one of two
	possible modes of operation for modems
	connected to dial lines (see permissive interface).
product code	A three-digit code indicating the modem's highest
	VF data rate.
protocol	The rules for timing, format, error control, and
	flow control during data transmission.

3830-A2-GB91-30 August 1998 Glossary-9