PROM

Programmable Read Only Memory.

Propagation Delay

The time required for a signal to travel from one end of a circuit to another.

Protocol

A set of conventions controlling the timing and format of data communications between two pieces of communications equipment.

Protocol Convertor

Device that converts from one protocol to another.

Public Domain Software

Software from which its author has relinquished copyrights. This software is free of charge and may be distributed for non-commercial purposes. Many bulletin boards and videotex systems carry public domain software for users to download. See also Shareware.

Public Switched Network

Telephone system providing circuit switching to many customers.

Pulse

An abrupt and relatively short change in voltage, either positive or negative, resulting in the conveyance of data in a circuit.

Q

Quadrature Amplitude Modulation (QAM)

A modulation technique which employs both amplitude and phase modulation to encode multiple bits in a single element.

R

RAM

Random Access Memory.

Received Line Signal Detector

See Carrier Detect.

Redundancy Check

Technique of error detection involving the transmission of additional data related to the message so that the receiving device can determine if the data transmitted is valid (error-free).

Page 278

Page 278
Image 278
Telenetics 56 manual Prom, Ram