Program-controlled exchange, also known as program-controlled digital exchange or digital program-controlled exchange, usually refers to the switching equipment used in the telephone exchange network, which uses computer programs to control the connection of telephones.
The basic functions of digital program-controlled switches are: subscriber line access, relay connection, billing, equipment management, etc.
Industrial waterproof telephones are communication devices designed for use in harsh and demanding environments. These telephones are built to withstand...