ISDN digital user's boards

The utility model relate to ISDN technique, in particular to a ISDN digital user board can realize grouped data operation, which solves the problem of ISDN digital user board can not connect the grouped accessing data of D pathway with the grouped data system in high speed. Compared with the present technique, the utility model adds a HDLC processor to the present ISDN digital user board, and is connected between the CPU and exchange module; the CPU sends the D pathway grouped data information to the grouped HDLC processor, the HDLC processor send the D pathway grouped data to exchange module in speed of64kb/s; the D pathway grouped accessing data high speed access to the grouped data system is realized, so the utility model can be used to accomplish AO/DIoperation.