| Access Floor - A system of flooring that has removable and interchangeable floor panels. The floor panels are supported on adjustable pedestals and, sometimes, stringers to allow access to the area beneath. |
| Aerial Cable - Telecommunications cable installed on supporting structures such as poles, sides of buildings, and other structures. |
| Alternate Route - A secondary communications path used to reach a destination. |
| Attenuation - The decrease in magnitude of power of a signal in transmission between points. It expresses the total losses on a transmission line based on the ratio of output power to input power. Attenuation is measured in decibels. |
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