GPRS 流量計算按1000臺營運(yùn)車輛計 換算表：主要表明在用量大時比傳統(tǒng)的費(fèi)用較低，如何根據(jù)自己的需求選擇通訊方式。 IP包頭長度為20字節(jié)，TCP包頭長度也是20字節(jié),共計40字節(jié)/條，協(xié)議回復(fù)40字節(jié)/包 終端上傳位置、報警等其他信息：平均為70＋40＋40＝150字節(jié)/條 終端上傳營運(yùn)數(shù)據(jù)：平均為110＋40＋40＝190字節(jié)/條 終端應(yīng)答搶答信息：平均為72＋40＋40＝152
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