TERMINAL ADAPTOR

摘要

PROBLEM TO BE SOLVED: To provide a terminal adaptor that can connect an analog terminal to a digital leased line and can be enough with number of lines less than that of the analog terminal. SOLUTION: Terminal adaptors 11, 12 can connect analog terminals 21-24 to a digital leased line 5 and are provided with a means that transmits/receives pseudo call control information utilizing pattern data depending on a combination of PB signals. The terminal adaptor can revise a length of data denoting the pseudo call control information depending on a reduced connection time and the operating environment.