| A | B |
|---|
| Attenuate | For a signal’s strength to weaken during propagation. |
| Propagate | To travel. |
| Signal | information-carrying disturbance that propagates through a transmission medium. |
| 232 Serial Port | The port on a PC that uses two voltage ranges to transmit information. |
| Signal-to-Noise Ratio (SNR) | The ratio of the signal strength to average noise strength; should be high in order for the signal to be effectively received. |
| Electromagnetic Interference (EMI) | Unwanted electrical energy coming from external devices, such as electrical motors, fluorescent lights, and even nearby data transmission wires. |
| Decibel (dB) | The unit in which attenuation is measured. |
| Binary Signaling | Signaling that uses only two states. |
| Crosstalk Interference | Mutual EMI among wire pairs in a UTP cord. |
| Parallel Transmission | A form of transmission that uses multiple wire pairs or other transmission media simultaneously to send a signal; increases transmission speed. |
| Serial Transmission | Ethernet transmission over a single pair in each direction. |
| Wavelength Division Multiplexing | Using signaling equipment to transmit several light sources at slightly different wavelengths, thus adding signal capacity at the cost of using slightly more expensive signaling equipment but without incurring the high cost of laying new fiber. |
| On/Off Signaling | Signaling wherein the signal is on for a clock cycle to represent a one, and off for a zero. (On/off signalling is binary.) |
| Digital Signaling | Signaling that uses a few states. Binary (two-state) transmission is a special case of digital transmission. |
| Point-to-Point Topology | A topology wherein two nodes are connected directly. |
