Digital Distribution frame between the digital multiplex equipment, digital program-controlled switching equipment and multiplexing equipment or wiring between the words business devices connected devices.
From the rate of 2 Mb/s ~ 155 Mb/s signal input and output can be terminated in DDF rack, which is wiring, transfer line, transfer, expansion is a great deal of flexibility and convenience to complete cable terminal, order, wire speed control features such as online testing convenient maintenance, low to achieve the flexibility to tune the circuit is a digital transmission lines and business changes and program-controlled switching system, one set of equipment essential for the spouse. The class implementation YD/T779-2006 standards.