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https://projectresearch.co.kr/2006/12/27/cdma%ec%9d%98-%ea%b3%bc%ea%b1%b0%ed%98%84%ec%9e%ac%eb%af%b8%eb%9e%98-umb-ev-do-rev-c/
CDMA의 과거/현재/미래- UMB (EV-DO Rev C)