Rad : imp. & p. p. of Read, Rede.

Example:
Whats the difference between between Rad and ISTD ballet examinations?

Taxonomy
RAD Data Communications, TDM, IP, multiplexer, Backhaul, Multiservice, modem, Technology, ATM, Network Access, Telecommunications Solutions, Gateways, Carriers, Service Providers, Fiber Optic, Products, Converters, SDH SONET.

Defination from the web:
Manufacturer of data access equipment for carriers and corporate networks.