1. Communication systems, including: public address and alarm systems, internal communication systems, call phone system, satellite communications, closed circuit television surveillance system (CCTV), private automatic branch exchange (PABX), industrial phones 2. Fire and gas detection system, including: fire detection systems, gas detection systems, industrial audio-visual equipment, audio-visual equipment, explosion-proof 3. The control and instrumentation systems, including: control box, alarm monitoring system, traction chains, tank level measurement system, electrical test bench and so on.
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These standards apply to communication between internal systems and external entities, such as the U.S. Food and Drug Administration.
这些标准应用于内部系统和外部实体(比如美国食品与药品安全管理局)之间的通信。
Explain how these two organizations utilize their internal communications systems as well as external communication systems with external organizations.
说明这两个组织是如何利用他们的内部通讯系统，以及外部通信系统与外部组织。
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