Short for phase-shift keying, a modulation technique used by modems in which different phase angles in the carrier signal are used to represent the binary states of 0 and 1.
The simplest method of PSK, also called biphase modulation, uses two signal phases – 0 degrees and 180 degrees. The digital signal is broken up according to time into binary digits and the state (1 or 0) of each bit is determined according the state of the bit that preceded it. If the phase of the bit does not change then the state of the signals stays the same. If the phase of the signal changes by 180 degrees, then the signal state changes (from 0 to 1, or 1 to 0).
There are more complex forms of PSK that rely on four or eight phases to transmit data at a faster rate.
Compare with FSK.
Short for packet-switched network, another name for a packet-switched data network.
Short for Plastic Small Outline Package, it’s a surface-mount memory packaging from Intel. key features of the PSOP include the following: JEDEC standard compliance, footprint and height 50 percent of DIP, two-side leaded for routing simplicity, 50 mil (1.27 mm) pitch for SMT simplicity and ease of use, gull wing formed leads, and it supports […]
- Public Switched Telephone Network (PSTN)
Short for Public Switched Telephone Network, which refers to the international telephone system based on copper wires carrying analog voice data. This is in contrast to newer telephone networks base on digital technologies, such as ISDN and FDDI. Telephone service carried by the PSTN is often called plain old telephone service (POTS).
- PS/2 port
A type of port developed by IBM for connecting a mouse or keyboard to a PC. The PS/2 port supports a mini DIN plug containing just 6 pins. Most PCs have a PS/2 port so that the serial port can be used by another device, such as a modem. The PS/2 port is often called […]
Short for Payment Transaction Application Layer, an open standard developed in part by CommerceNet that allows merchants to accept any type of electronic payment over the Internet.