6ES7 223-1HF22-0XA8
6ES7 223-1HF22-0XA8
6ES7 223-1HF22-0XA8
6ES7 223-1HF22-0XA8
GPRS（General Packet Radio Service）是通用分組無線業(yè)務(wù)的簡(jiǎn)稱，是在GSM業(yè)務(wù)基礎(chǔ)上發(fā)展起來的一種分組交換的資料承載和傳輸方式。GPRS的用戶只需購(gòu)買SIM卡并開通數(shù)據(jù)服務(wù)業(yè)務(wù)而無需自行建站，具有充分利用現(xiàn)有的移動(dòng)通信網(wǎng)絡(luò)、資源利用率高、始終在線、傳輸速率高、資費(fèi)合理等特點(diǎn)。GPRS提供了一種高效、低成本的無線分組數(shù)據(jù)業(yè)務(wù)，特別適用于不間斷的、突發(fā)性的和頻繁的、少量的數(shù)據(jù)傳輸，也適用于偶爾的大數(shù)據(jù)量傳輸。GPRS是目前階段解決移動(dòng)通信信息服務(wù)的一種完美、有廣闊前景的業(yè)務(wù)。
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GPRS用戶只有在發(fā)送或接收數(shù)據(jù)期間才占用資源，這意味著多個(gè)用戶可高效率地共享同一無線信道，從而提高了資源的利用率。同時(shí)，用戶只需按數(shù)據(jù)通信流量付費(fèi)，而無需對(duì)整個(gè)鏈路占用期間付費(fèi)。不會(huì)產(chǎn)生像撥號(hào)方式按占用線路時(shí)和收費(fèi)的情況，實(shí)際上，GPRS用戶可能連接的時(shí)間長(zhǎng)達(dá)數(shù)小時(shí)而沒有產(chǎn)生大量的數(shù)據(jù)流量，就只需支付相對(duì)低廉的連接費(fèi)用，可使用戶的使用費(fèi)用大大降低。同時(shí)隨著電信移動(dòng)公司的交費(fèi)調(diào)整，各類的數(shù)據(jù)套餐產(chǎn)品的出現(xiàn)，可實(shí)現(xiàn)用戶包月或包年制的數(shù)據(jù)通信服務(wù)，進(jìn)一步的降低運(yùn)行成本。
GPRS系統(tǒng)結(jié)構(gòu)圖：
基于GPRS的遠(yuǎn)程監(jiān)控具有以下特點(diǎn)：
1、快速登錄，永遠(yuǎn)在線、實(shí)時(shí)性強(qiáng)、兼容性好：
由于GPRS具有實(shí)時(shí)在線特性，無需輪巡就可以同步接收、處理多個(gè)監(jiān)控制點(diǎn)的各種數(shù)據(jù)。可很好的滿足系統(tǒng)對(duì)數(shù)據(jù)采集和傳輸實(shí)時(shí)性的要求。支持900／1800／1900MHz三頻GSM/GPRS。
2、安全性高，可靠性強(qiáng)，可實(shí)現(xiàn)雙向數(shù)據(jù)傳遞
系統(tǒng)在數(shù)據(jù)傳輸過程中加入了加密機(jī)制，數(shù)據(jù)可以在公網(wǎng)上安全地傳輸；可靠性強(qiáng)，系統(tǒng)具有糾錯(cuò)、重發(fā)機(jī)制，從而確保數(shù)據(jù)的完整性和正確性。其次，系統(tǒng)具有自動(dòng)恢復(fù)功能，在GPRS網(wǎng)絡(luò)狀態(tài)不穩(wěn)定的情況下，保證系統(tǒng)穩(wěn)定工作，而無需人工干預(yù)?？蓪?duì)各監(jiān)測(cè)點(diǎn)儀器設(shè)備進(jìn)行遠(yuǎn)程雙向控制：通過GPRS雙向系統(tǒng)除可正向采集信息外還可實(shí)現(xiàn)對(duì)儀器設(shè)備進(jìn)行反向控制，如：時(shí)間校正、狀態(tài)報(bào)告、開關(guān)等控制功能。
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