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What is Vp?
Voltage peak: Either the positive maximum or the negative maximum
What is Vpp?
Voltage peak to peak: The voltage between the negative peak and the positive peak.
Sum of both peaks = Vpp= 2vp
What does VRMS stand for?
Voltage Root Means Square
What is VRMS?
It is a value less than Vp
What is a cycle?
One positive alteration and one negative alteration
the number of cycles completed in a given amount of time
Frequency is measured in?
Hertz = Hz
What are the characteristics of a Square wave?.
- 1. Amplitudes
- 2. Risetime
- 3. Falltime
- 4. Pulse width
Resistance is measured in?
Capacity is measured in?
Inductance is measured in?
Unshielded twisted pair
Shielded twisted pair
Cat 3 has how many wires?
2 pairs of twisted pair=RJ11
CAT5 Has how many wires?
4 pairs of twisted wire = RJ45
What is ELF?
Extremly low frequency= 30-300Hz
Low end of the human audio range
What is VF?
Voice frequency= 300-3,000Hz
What is VLF?
Very low frequency= 9KHz-30KHz
Higher end of human hearing, musical intruments, government & military: Navy communication
What is LF?
Low frequency= 30K-300KHz
Marine and aeronautical
What is MF?
Medium frequency= 300K-3000KHz
What is HF?
High frequency= 30M-30MHz
CB, Amateur radio, Diplomatic communications between embassies
What is VHF?
Very High frequency= 30MHz-300MHz
FM radio stations, TV channels 2-13, mobile radio
What is UHF?
Ultra High frequency=300MHz-3000MHz=3GHz
UHF TV channels 14-67, cell phones
What is SHF?
Super high frequency=
Microwave ovens, statelite radio, and wireless lans
What is EHF?
Extremely High frequency=30GHz-300GHz
Satelite communication for telephony, computer data and specialized radar
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
What does CSMA stand for?
Carrier sense multiple access collision detect
What is MAC?
Media Access Control = physical address
What does a Switch do?
makes frames which are the first to pass data, frame is handled by the NIC
What is a Gateway?
A device that acts as an entrance to another network
What is XDSL?
generic name for all DSL technologies
What is ADSL?
Asymmetric Digital Subline
9,000-18,000 feet from Centeral office
Upstream and downstream are different
What is the function of the DSL filter?
Seperate the low frequency analog signal from the data signal
Where is the DSLAM located?
The residential gateway functions in what layer of the OSI model?
Layer Three=Network Layer
What is TCP/IP?
Transmission control protocol/Internet Protocol
A set of protocols used to communicate across interconnected networks
Wide area network
A network that interconnects LANs that span a larger geopgraphical area
A communications protocol that allows compatible home networking products to talk to each other via existing 110-Volt elertical wiring in the home.
Network Interface Card
A computer circuit board that provides an interface to connect to a network.
What is De-Encapsulation?
Stripping data packets of addressing information.
What is a MAC address?
A unique indentifier assinged to the NIC that enable communication between devices.
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.
What is watermarks?
Encryption system used on DVDs to prevent duplication.
Personal Video Recorder
What is ANSI/EIA-570-A-3?
Details for standards-compliant audio cabling.
What does NTSC stand for?
National Television Standards Committee
What is a composite?
The most common type of video connector
What is a dedicated signal?
A signal that is used for a specific purpose.
What is a Distrubed signal?
A signal that may be channeled for multiple purposes.
What is a component?
A connector that produces high-quality video output.
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