Understanding Telecommunications: From Wireline to GPS
Wireline and Wireless Communication
Wireline: Requires a physical medium for sending information.
Wireless communication: Does not require a physical medium.
When to Use Interference-Shielded Cables
Interference-shielded cables are used repeatedly when there is a need to minimize external interference.
Cost Comparison
Cable systems are generally more expensive than wireless systems.
Ubiquity of Wireless Systems
The great advantage of wireless systems is their ubiquity.
Telephone Operation
- When speaking, emitted
Understanding Computer Basics: Units, Software, and OS
Units of Measurement in Computing
The nature of information is analog, meaning signals are continuous in time. In contrast, information on computers is represented by digits, the language of computers. In everyday life, we express information using a given language and a decimal number system. Computer circuitry recognizes two types of digital electrical signals: the presence of a signal, equivalent to 1, and the absence of a signal, 0. This language of 1s and 0s is called the binary digital system.
Read MoreUnderstanding Electricity and Electrical Circuits
Electricity
Electricity: Power is a form of motion. It is electrons. Matter is formed by molecules. The nucleus is composed of protons with positive mass and electric charge, and neutrons.
Electric Charge
One can say a body is negatively charged when it has an excess of electrons, and positively charged when it has a defect of electrons. In the neutral state, the number of electrons equals the number of protons. The electric charge of a body is the excess or deficiency it has of electrons, and is measured
Read MoreUnderstanding System Dynamics: Inputs, Outputs, and Feedback
System Components and Their Interactions
Input: Systems require inputs to operate. These inputs can be information, energy, or materials.
- Information: Anything that reduces uncertainty, providing guidance, knowledge, and enabling planning.
- Energy: The capacity to move and stimulate the system’s functioning.
- Materials: Resources used by the system to produce output. Operational materials transform other resources, while others are converted into output.
Through the input stage, the system imports resources
Effective Telephone Communication in Business
1. Telephone Communication
Importance in Business: It is used to arrange meetings, interviews, or to ask for information.
2. Telephone Means and Equipment
Fixed Individual Devices (copper networks have been replaced by optical fiber networks)
Private Branch Exchanges (PBX): It connects calls between two destinations or ends.
Function: Call transfers among extensions, caller ID…
Types:
- IP PBXs
- Call Centers: They manage just phone calls
- Contact Centers: They not only manage phone calls but emails, SMS, online
AM/FM Radio Stage Analysis: Antenna, IF, Audio, and Demodulation
AM Receiver RF Stage Conclusions
An AM antenna, typically a fine enameled copper wire with a ferrite core, receives signals. These signals are then classified through a resonance system. A tank circuit, consisting of a variable capacitor and coil, disperses the signals in various processes.
The AM antenna can be considered a transformer with a primary and secondary winding.
A tank circuit, formed by a coil and a capacitor, resonates and acts as a signal classifier.
IF Stage and Demodulator Conclusions
The