TDM signal line controller - has cycle time divided into phases reflecting number of control phases

摘要

The line controller ensures that the signalling criteria are transferred reliably between subscribers connected to a special network and betweena a subscriber connected to the special network and one connected to the public switched network. The control unit operates using TDM and has its cycle time divided into phases reflecting the number of control phases. These phases are counted by a scanner. An access unit contains a buffer register, which stores information exchanged between the control unit and the selecting arrangement. A memory unit contains a number of direct access memories to retain the condition (free, busy etc) of the lines.