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low-voltage-systems.md

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