GPRS 流量计算按1000台营运车辆计 换算表：主要表明在用量大时比传统的费用较低，如何根据自己的需求选择通讯方式。 IP包头长度为20字节，TCP包头长度也是20字节,共计40字节/条，协议回复40字节/包 终端上传位置、报警等其他信息：平均为70＋40＋40＝150字节/条 终端上传营运数据：平均为110＋40＋40＝190字节/条 终端应答抢答信息：平均为72＋40＋40＝152
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