Category Archives: Notes

Notes for A+ Exams

CABLE MODEM

A cable modem is a type of network bridge and modem that provides bi-directional data communication via radio frequency channels on a HFC and RFoG infrastructure. Cable modems are primarily used to deliver broadband Internet access in the form of … Continue reading

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CRT MONITORS: RULE OF THUMB WHEN REPAIRING

Never use an anti-static wrist strap while working on a CRT monitor, even if it is unplugged. CRT monitors operate on very high voltages — sometimes as high as 40,000 volts — and can hold these voltages for a long … Continue reading

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WHAT IS A VOLT AND HOW DOES IT RELATE TO VOLTAGE?

A single volt is defined as the difference in electric potential across a wire when an electric current of one ampere dissipates one watt of power. It is also equal to the potential difference between two parallel, infinite planes spaced … Continue reading

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CIRCUIT NOISE REDUCTION TECHNIQUES

In many cases noise found on a signal in a circuit is unwanted. There are many different noise reduction techniques that can change a noisy altered output signal. Faraday cage – A Faraday cage is a good way to reduce … Continue reading

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ISDN

ISDN is a circuit-switched telephone network system, which also provides access to packet switched networks, designed to allow digital transmission of voice and data over ordinary telephone copper wires, resulting in potentially better voice quality than an analog phone can … Continue reading

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SALES MASTERY

SALES MASTERY

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