| A | B |
|---|
| Backbone | Primary Path |
| Catchment Area | Area served by a networking device |
| Horizontal Cross-Connect | Wiring closet which connects to the MDF |
| Hub | Center of a star topology |
| Intermediate Distribution Facility | Secondar communications room |
| Main Cross Connect | Wiring closet with most control of a star topology |
| Main Distribution Facility | Primary communications room |
| Micron | One millionth of a meter |
| Oscillation | Secondary signal on top of the 60-Hz waveform |
| Patch Panel | Grouping of RJ-45 jacks |
| PBX | Digital or analog telephone switch board |
| POP | Connection between telephone company and MDF |
| Sag | Decrease below 80% of normal voltage |
| Spike | Power impulse with amplitude over 100% from .5 to 100 microseconds |
| Surge | Voltage increase above 110% of normal |
