PACS - PERSONAL ACCESS COMMUNICATIONS-SYSTEM - AN ALTERNATIVE-TECHNOLOGY FOR PCS

The personal access communications system (PACS) is an American Nation al Standards Institute common air interface standard developed for the 1.9 GHz PCS band in the United States. PACS uses frequency division d uplexing technology and is optimized to support low-mobility pedestria n outdoor usage and wireless local loop applications in a medium-range environment. PACS-Unlicensed B (PACS-UB) is a version of PACS using t ime division duplexing. PACS-UB has been optimized for private, indoor wireless PBX applications and cordless telephony. Both modes of opera tion are supported using the same portable hardware and the same signa ling protocol. This article is an enhancement of ''PACS: Personal Acce ss Communications System: A Tutorial,'' by A. R. Noerpel, Y.-B. Lin, a nd H. Sherry, which appeared in the June 1996 issue of IEEE Personal C ommunications.