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• 實際工程經驗和技術支持
Use example to illustrate integration with existing system.
For example, Police National Computer (PNC) in UK is an existing
database, where licence plate search application was integrated. This
allowed police on the roads/motorways to make checks as and when
necessary. Previously, police would have had to call Dispatch Centre
to raise search, taking up valuable time and tying up two people –
police office & control room - to perform a simple task.
超大容量及超高密度話務量的考慮
• 用戶密度高：如某機場，根據需求調研和預測，到2010年系統用戶將超
過10000臺。
• 話務量大：系統必須能夠承受高密度大話務量的沖擊
選擇系統要求：
• 分布式處理設計：專為關鍵任務而設計的系統，保障“接入時間”始終小
于500ms。
• 輔助集群調度功能：通過“強拆、強插、動態數據信道”等功能保障高優
先級的調度通話，以及通過“通話組合并”、“區域呼叫”等功能降低話務
量。
奧運會、世界杯、世博會、亞運會的實踐檢驗。
Use example to illustrate integration with existing system.
For example, Police National Computer (PNC) in UK is an existing
database, where licence plate search application was integrated. This
allowed police on the roads/motorways to make checks as and when
necessary. Previously, police would have had to call Dispatch Centre
to raise search, taking up valuable time and tying up two people –
police office & control room - to perform a simple task.
全國呼叫建立時間
區域交換中心，全功能、全國覆蓋
• 全功能廣域覆蓋
• 無縫連接:全國快速呼叫
• 無縫漫游: 用戶漫游時保持呼叫
連接
×
During the introduction we already discussed the need for public safety organisations
to coordinate operations across large geographical areas. Dimetra IP allows for this
due to the wide area coverage capability of the system.
But mere coverage is not enough. Performance and functionality of the network need
to be maintained as users roam across the coverage area: Group and emergency calls
must be established with minimal delay. Dimetra IP uses a ”flat mesh” architecture,
with no need for calls to travel across multiple transit switches with considerable delays
as it is seen in traditional circuit switched networks. With Dimetra IP calls are set up in
fractions of a second no matter where in the network the call participants may be
located. We call this ”Seamless Connection”. In a coordinated drug bust, for
example, where multiple Police squads conduct a national raid, there is no time to wait
for a call to be set up on the communication system. Again, time is a critical factor.
Now, once a call is set up it is critical that communication is maintained, while users on
the call roam across the network. ”Seamless roaming” allows officers to conduct calls
in hot pursuit of suspects, without having to adjust radio settings or worrying about
whether their back up teams are in a different county. Motorola Dimetra IP is the only
TETRA system currently available to provide this functionality.
單站集群功能（LST）
• 基站用戶登記
• 真正集群
• 控制信道備份
• 組呼（編組不變）
• 主叫顯示
• 緊急呼叫
• 排隊回呼
• 遲后加入
• 定時自動提示
• 自動恢復廣區集群
機場B
機場A
鏈路故障概率比設備故障高，且設備有（熱）備份。
金羊網-新快報和http://news.tom.com 2003年07月06日報道:
前天（7月4日）10時53分至12時26分，首都機場離港系統因發生設備
故障而癱瘓93分鐘，無法為旅客辦理登機手續。共有71個出港航班因
此發生延誤，至少3000名旅客無法準時登機。有關方面在當天下午召
開的新聞發布會上稱，此次事故是通信網絡中的光通信接點機發生故
障造成的。首都機場離港系統前端在機場、后臺在中航信。離港系統
的所有設備都是雙備份的，只有與電信部門的接點機沒有備份。據介
紹，這樣的情況當天在中國其他機場也有發生。
網易報道：羅馬尼亞小偷一夜卷走數百電纜機場癱瘓5小時
http://news.163.com 2005-03-15 08:22:20 英國媒體14日報道，最近
，羅馬尼亞兩名小偷來到首都布加勒斯一家機場，盜走300根31米長的
電纜，導致機場停電，而癱瘓了至少5個小時。當時，這兩名小偷乘著
夜黑風高，偷偷潛入布加勒斯特一家機場的后勤中心，盜走其內300根
31米長的電纜。其后，原本燈火通明的機場瞬間變得漆黑一片，原本
由電子卡控制的所有大門也失去了功能，整個機場癱瘓了至少5個小時
。
開放IP 接口
第三方應TETRA 主機應智能
IP 交換網
電信網
公司
互聯網
應用軟件的增值解決方案可以平滑經濟地接入
基
移動應
內部計算機網
IP交換和支持IP連接：接入各種應用和業務
Motorola has an open interface policy, that ensures that third party products and
　
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