Method for realizing quick retrieval positioning through virtual access connection

Based on variable digit of bit value of virtual path identifier (VPI) and virtual channel identifier (VCI), the method sets up mask and reference value of VPI and VCI in advance. The method also includes following steps: (1) picking up VPI and VCI from received ATM cell or ATM primitive; (2) comparing VPI, VCI picked up from step (1) with mask setup in advance so as to obtain invariable bit value of each current VPI and VCI; if invariable bit values of VPI and VCI are identical to each own reference value, then executing step (3), otherwise exiting this flow; (3) based on mask, picking up variable digit of bit value of VPI and VCI in sequence, constituting virtual channel connection identifier (VCCI); (4) carriying out searching in VCC table based on VCCI so as to locate corresponding VCC. Advantages are: rapid positioning without limiting range of VPI and VCI. Thus, VPI and VCI can be configured flexibly.