77 lines
1.7 KiB
Markdown
77 lines
1.7 KiB
Markdown
---
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id:
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aliases: []
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tags:
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- topic/construction/electrical
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- type/encyclopedia
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title: Low Voltage Systems
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dg-publish: true
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---
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# Low Voltage Systems
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> [!info] See Also
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> * [[emergency-communications-systems]]
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> * [[fire-alarm]]
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## Radio Repeater Systems
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### Bi-Directional Amplifier (BDA)
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Used to facilitate radio (usually cellular) communication
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where it is inhibited by the facility structure.
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Consists of a donor antenna, bi-directional amplifier,
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and any number of remote units
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where hard-wired connections to the BDA can be made.
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### Distributed Antenna System (DAS)
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Used to extend wireless communication throughout a facility.
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While active DAS can be said to _require_ a BDA system,
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in practice a "DAS System" almost always refers
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to all the equipment required for its operation.
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## Security Systems
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### Electronic Security System (ESS)
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### Intrusion Detection System (IDS)
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### Access Control System (ACS)
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### Video Surveillance
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> [!info] Also Known As
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> * Closed-Circuit Television (CCTV)
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## Communications
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### Telecommunications (Telecom)
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> [!info] Also Known As
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> * Voice/Data
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### Structured Cabling:
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Refers to a standardized architecture
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of telecommunications cabling and equipment.
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Architecture is star-shaped, paralleling building electrical distribution.
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* Main Distribution Frame (MDF)
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* Intermediate Distribution Frames (IDFs)
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### Community Antenna Television (CATV)
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Used to deliver radio frequency (RF) or digital television programming signals
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from a single antenna to multiple devices.
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A building CATV system may include the "picking antenna"
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or instead include connection to a local utility's.
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## Sound Systems
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### Intercommunications (Intercom)
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### Audio Visual (AV)
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