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| 20 mA Current Loop |
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| A data communications format that can be used for long distance network communications over dedicated “hard copper” telephone lines. Logic states are represented by current flow and the absence of current flow. |
| 25 VRMS Audio |
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| Audio distribution that uses a constant 25 VRMS signal and a multi-tap transformer at each speaker to adjust individual speaker volume. |
| 4 Hour zone |
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| A device that remains armed constantly. Examples of 24 hour devices are Fire and Panic. |
| 70 VRMS Audio |
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| Audio distribution that uses a constant 70 VRMS signal and a multi-tap transformer at each speaker to adjust individual speaker volume. |
| A-Weighted |
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| A method of measuring sound loudness as perceived by the human ear. |
| ACAM |
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| Access Control and Alarm Monitoring. |
| Access |
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| A means to enter an area or obtain certain information. |
| Access Code |
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| A combination of numbers and/or letters that identifies an individual to a system, for the purpose of authorizing entry or use by the individual. |
| Access Level |
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| The privileges assigned to an individual specifying the levels of fire alarm control panel access. |
| Account |
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| A subscription to a Central Monitoring Station’s services. |
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