(1) (Primary Domain Controller) A Windows NT/2000 service that manages security for its local domain. Every domain has one PDC, which contains a database of usernames, passwords and permissions. The PDC also provides a time service for the network and typically obtains the time from an edge router, which gets its time from the Internet. See BDC.

(2) (Personal Digital Communications) A digital cellular phone system widely used in Japan. Based on TDMA, it transmits in the 810-826 MHz and 1477-1501 MHz bands. PDC is a 2G wireless system. See cellular generations and PHS.