Patent ID: 7672329

Claim:
An apparatus for multiplexing or demultiplexing data between a high-speed line and a low-speed line using a reception buffer and a transmission buffer, the apparatus comprising: a generating unit that generates an apparatus reference frame phase that becomes a reference in the apparatus, based on a reception frame phase of a data input to a predetermined reception buffer and a predetermined delay amount; a monitoring unit that monitors whether a specific amount of the data is accumulated in the reception buffer; a selecting unit that selects to read the data based on the apparatus reference frame phase or based on a result of monitoring by the monitoring unit; a data reading unit that reads the data from the reception buffer based on the apparatus reference frame phase or based on the result of the monitoring by the monitoring unit, according to a selection by the selecting unit; and a multiplexing/demultiplexing unit that multiplexes or demultiplexes the data read by the data reading unit.