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School/Analyse/Layers/1. Physical Layer.md
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@ -52,6 +52,7 @@ Phase specifies the location or timing of a point within a wave cycle of a repet
## Analog ## Analog
**Analog Signals** can have a infinite number of possible values in a range. **Analog Signals** can have a infinite number of possible values in a range.
For example: 0.0 <-> 1.0 For example: 0.0 <-> 1.0
- 0.1436367436473...... - 0.1436367436473......
- 0.54454764654765...... - 0.54454764654765......
@ -59,7 +60,19 @@ For example: 0.0 <-> 1.0
**Analog data** is continuous and have continuous values. **Analog data** is continuous and have continuous values.
Values in analog data are always changing. Values in analog data are always changing.
A good analogy for analog data is like a physical clock with A good analogy for analog data is like a physical (analogue) clock with hands.
The hands on a clock like that are always moving (continuous) and do not have a specific value.
## Digital ## Digital
Digital data is information represented as a string of discrete symbols each of which can take on one of only a finite number of values from some alphabet, such as letters or digits.
For example:
- a
- b
- 1
- 0
These values are specific and are not changing.