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What is Vp?
Voltage peak: Either the positive maximum or the negative maximum
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What is Vpp?
Voltage peak to peak: The voltage between the negative peak and the positive peak.
Sum of both peaks = Vpp= 2vp
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What does VRMS stand for?
Voltage Root Means Square
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What is VRMS?
It is a value less than Vp
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What is a cycle?
One positive alteration and one negative alteration
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Frequency is?
the number of cycles completed in a given amount of time
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Frequency is measured in?
Hertz = Hz
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What are the characteristics of a Square wave?.
- 1. Amplitudes
- 2. Risetime
- 3. Falltime
- 4. Pulse width
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Resistance is measured in?
Ohms= R
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Capacity is measured in?
farods= C
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Inductance is measured in?
Henry=L
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UTP?
Unshielded twisted pair
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STP?
Shielded twisted pair
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Cat 3 has how many wires?
2 pairs of twisted pair=RJ11
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CAT5 Has how many wires?
4 pairs of twisted wire = RJ45
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What is ELF?
Extremly low frequency= 30-300Hz
Low end of the human audio range
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What is VF?
Voice frequency= 300-3,000Hz
Human speech
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What is VLF?
Very low frequency= 9KHz-30KHz
Higher end of human hearing, musical intruments, government & military: Navy communication
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What is LF?
Low frequency= 30K-300KHz
Marine and aeronautical
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What is MF?
Medium frequency= 300K-3000KHz
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What is HF?
High frequency= 30M-30MHz
CB, Amateur radio, Diplomatic communications between embassies
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What is VHF?
Very High frequency= 30MHz-300MHz
FM radio stations, TV channels 2-13, mobile radio
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What is UHF?
Ultra High frequency=300MHz-3000MHz=3GHz
UHF TV channels 14-67, cell phones
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What is SHF?
Super high frequency=
Microwave ovens, statelite radio, and wireless lans
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What is EHF?
Extremely High frequency=30GHz-300GHz
Satelite communication for telephony, computer data and specialized radar
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What are the three types of Optical spectrums?
- 1. Infared-LED
- 2. Visible - light, light waves
- 3. ultraviolet- UV- Generated by sun,flourescent lamps & sun lamps
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What does CSMA stand for?
Carrier sense multiple access collision detect
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What is MAC?
Media Access Control = physical address
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What does a Switch do?
makes frames which are the first to pass data, frame is handled by the NIC
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What is a Gateway?
A device that acts as an entrance to another network
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What is XDSL?
generic name for all DSL technologies
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What is ADSL?
Asymmetric Digital Subline
9,000-18,000 feet from Centeral office
Upstream and downstream are different
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What is the function of the DSL filter?
Seperate the low frequency analog signal from the data signal
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Where is the DSLAM located?
Centeral office
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The residential gateway functions in what layer of the OSI model?
Layer Three=Network Layer
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What is TCP/IP?
Transmission control protocol/Internet Protocol
A set of protocols used to communicate across interconnected networks
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WAN?
Wide area network
A network that interconnects LANs that span a larger geopgraphical area
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X-10?
A communications protocol that allows compatible home networking products to talk to each other via existing 110-Volt elertical wiring in the home.
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NIC?
Network Interface Card
A computer circuit board that provides an interface to connect to a network.
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What is De-Encapsulation?
Stripping data packets of addressing information.
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What is a MAC address?
A unique indentifier assinged to the NIC that enable communication between devices.
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What is HomePNA
A technology that uses the existing phone line. The technology supports up to 25devices and delivers a contant 10Mbps, wheter or not phone is in use.
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What is watermarks?
Encryption system used on DVDs to prevent duplication.
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PVR
Personal Video Recorder
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What is ANSI/EIA-570-A-3?
Details for standards-compliant audio cabling.
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What does NTSC stand for?
National Television Standards Committee
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What is a composite?
The most common type of video connector
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What is a dedicated signal?
A signal that is used for a specific purpose.
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What is a Distrubed signal?
A signal that may be channeled for multiple purposes.
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What is a component?
A connector that produces high-quality video output.
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