PSTN Public switched telephone network. Public telephone system. PTA Public telephone authority or administration. PTO Public telephone operator. PTT Post, telegraph and telephone administration.
Real time Refers to applications which perform tasks without delay.
Rightsizing Installing supposedly cost-effective computer or communications systems, but often used as a more neutral way of talking about downsizing. Router Specialised computer used to link dissimilar networks. A link between systems or resources in which only one channel is active at one time carrying a single bit stream. Component of information systems comprising instructions for hardware. Sometimes this is understood to refer to the programs and the physical media on which they are supplied.