架構分為三層
1. Physical layer:
Bits在空氣中的傳送接收
轉換訊號 提供bit/frame level的error control
2.1. Medium access control sublayer:
控制空氣中不同的使用者
實做analogous functions as a MAC entity以控制LAN
manages the access of different (low-speed voice and high-speed data) users to the shared air interface.
2.2. Signaling link access control sublayer:
提供可靠度
3. Upper layer:
負責整體IS-2000系統控制
It exercises this control by serving as the point that processes all and
originates new signaling messages. The information (both data and voice) messages
are also passed throughhere
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