A switch station including an ATM switch; a memory storing control data
for operations of the switch station; an intra-station device,
accommodating a subscriber line, performing communication operation on
subscriber ATM cell; a control processor generating control information
in link access protocol (LAP) format; and an interface unit converting
LAP control information into ATM cell to the intra-station device through
the ATM switch, wherein the control information is communicated according
to LAP, the intra-station device receives the control information and
transmits a direct memory access request to obtain control data stored in
the memory, the interface unit obtains and converts the data format of
the control data into ATM cell to transmit to the intra-station device
through the switch, and the intra-station device performs the
communication operation on the subscriber ATM cell based on the control
data received through the switch.