Abstract: A data-link processing equipment which reduces the processing delay of the data-link data and performs the data-link processing with a good efficiency and an apparatus for a subscriber terminal office using this equipment. This data-link processing equipment provides a data-link synchronizing unit which establishes the synchronization of the data-link data extracted from frame synchronizing units respectively for a plurality of digital transmission lines; a data-link interface unit which latches the data-link data and outputs a data update flag; and a processor which reads and processes the latched data-link data by using the data update flag as an interrupt signal.

Abstract: A subscriber terminal apparatus for connecting plurality of subscriber lines from subscriber units with a remote switching station via communication lines, the apparatus including: a selective switching unit, provided with a first number of subscriber terminals connected to the respective subscriber lines and a second, smaller number of station terminals connected to the communication lines, for selectively switching connections between the station terminals and the subscriber terminals; a communication unit, associated with the communication lines, for transmitting a signal from the apparatus to the switching station and for receiving a control signal supplied from the switching station; and a control unit, associated with the communication unit and the selective switching unit, for selecting one of the subscriber terminals of the selective switching unit and one of the station terminals thereof in accordance with the control signal from the communication unit, and for controlling the switching operation of