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Option 4 : 1, 2 and 3
The correct answer is 1, 2 and 3.
Short Range Devices (SRD)
- Short Range Devices (SRD) are radio devices that offer a low risk of interference with other radio services, usually because of their transmitted power, and hence their range is low.
- The definition 'Short Range Device' may be applied to many different types of wireless equipment including various forms of:
- Access control (including door and gate openers).
- Alarms and movement detectors
- Cordless audio devices, including wireless microphones.
- Closed-circuit television (CCTV): CCTV (closed-circuit television) is a TV system in which signals are not publicly distributed but are monitored, primarily for surveillance and security purposes.
- Wireless Local Area Networks: A wireless local area network (WLAN) is a wireless distribution method for two or more devices.
- WLANs use high-frequency radio waves and often include an access point to the Internet.
- A WLAN allows users to move around the coverage area, often a home or small office, while maintaining a network connection.
- A WLAN is sometimes called a local area wireless network (LAWN).
- Radio Frequency Identification: Radio Frequency Identification (RFID) is a technology that uses radio waves to passively identify a tagged object.
- It is used in several commercial and industrial applications, from tracking items along a supply chain to keeping track of items checked out of a library.
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