DCE to DTE connection adapter for communication device

A connection adapter for connecting high-level equipment and a first communication device, wherein:

• said high-level equipment comprises Data Terminal Equipment;
• said first communication
• device comprises Data Circuit-terminating Equipment for a first network connection service;
• said high-level equipment is designed to be connectable to a second communication device;
• said second communication device comprises Data Circuit-terminating Equipment for a second network connection service;
• and said connection adapter comprises a communication control unit configured to:
• convert, in accordance with prescribed rules, first data received from the high-level equipment and for use by the second communication device, the first data converted so as to be normally processible by the first communication device;
• transmit the converted first data to the first communication device or relay the received first data to the first communication device intact or discard the received first data;
• convert, in accordance with other prescribed rules, second data received from the first communication device, the second data converted so as to be normally processible by the high-level equipment;
• and
• transmit the converted second data to the high-level equipment or relay the received second data to the high-level equipment intact or discard the received second data.