Symbian OS 及通讯技术术语全解

核心提示：OSOperating System: historically, the minimal set of software needed to manage a device's hardware capability and share it between application programs. Pra

OS

Operating System: historically, the minimal set of software needed to manage a device's hardware capability and share it between application programs. Practically, "OS" is now used to mean all software including kernel, device drivers, comms, graphics, data management, GUI framework, system shell application, and utility applications. This would define Windows, Palm OS and MacOS as operating systems. Symbian provides an operating system ? Symbian OS ? tailored for data-enabled mobile phones.

操作系统：在历史上，是指管理设备能力并在应用程序之间共享该能力所必需的一组最少的软件。实际上，“OS”目前用来表示所有软件，其中包括内核、设备驱动程序、通信、图形、数据管理、GUI 框架、系统shell 应用程序和实用程序。这将把Windows、Palm OS 和MacOS 定义为操作系统。Symbian 提供了一个操作系统Symbian 操作系统，该操作系统是为允许使用数据的手机定制的。

Packet-Switching

Technique whereby the information (voice or data) to be sent is broken up into packets, of at most a few KB each, which are then routed by the network between different destinations based on addressing data within each packet. Use of network resources is optimized, as the resources are needed only during the handling of each packet. This is an ideal model for ad hoc data communication, and works well also for voice, video and other streamed data. Mobile phones with packet-switched communication appear to be "always connected" to the data network, whereas in the case of circuit-switched connections, setup time takes around 30 seconds to connect from a mobile phone to an ISP. Use of packet-switched network can be charged according to the volume of data transferred and not to any notion of time spent online.

该技术将所发送的信息(语音或数据)分成多个数据包，每个数据包最多有几个KB，这些数据包随后由网络基于每个数据包中的寻址数据在不同目标之间发送。由于只在处理每个数据包期间才需要资源，所以优化了网络资源的利用。这对于特别的数据通信是理想模型，且还适用于语音、视频和其他流化数据。具有分组交换通信功能的手机似乎“始终连接”到数据网络，但是，对于电路交换连接，设置时间大约需要30