20世纪80年代中期，当模拟蜂窝移动通信系统刚投放市场时，世界上的发达国家就在研制第二代移动通信系统。其中最有代表性和比较成熟的制式有泛欧GSM (Global system for Mobile communication)，美国的ADC(D-AMPS)和日本的JDC(现在改名为PDC)等数字移动通信系统。在这些...
Network Working Group P. Deutsch Request for Comments: 190 Xerox Research Center, Palo Alto, CA NIC: 7135 13 July 1971 DEC PDP-10 -- IMLAC communication system This report describes an operational system for communicating textual display information...
Network Working Group D. C. Walden Request for Comments: 62 BBN Inc. Supercedes NWG/RFC#61 3 August 1970 A system for Interprocess communication in a Resource Sharing Computer Network 1. Introduction If you are working to develop methods of communica...