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目前在无线通信技术领域，美、日、欧构成三足鼎立的局面，它们分别采用个人接入通信系统（PACS）、个人手持系统（PHS）和数字泛欧无绳电话（DECT）技术，其中美国的PACS在其技术，性能上具有其独到的特点。PACS标准是美国7个个人通信系统（PCS）标准之一，它是PHS和Bellcone
At present, in the field of wireless communication technology, the United States, Japan and Europe constitute the three pillars of the situation. They adopt the personal access communication system (PACS), the personal hand-held system (PHS) and the digital pan-European cordless telephone (DECT) technology respectively. In its technology, performance has its own unique characteristics. The PACS standard is one of seven personal communications system (PCS) standards in the United States, which is a combination of PHS and Bellcone