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| What does the term TRANSMIT mean? |
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| To issue signals to the network medium. |
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Transmission refers to what? |
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either the process of transmitting or the progress of signals after they have een transmitted. In other words you could say "My NIC transmitted a message, but because the network is slow, the transmission took 10 seconds to reach the server." |
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| Strength of an electrical current. This is what analog and digital are measured in. |
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| When talking about strength of a volt it is called a ? |
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A wave is measured by its strength at any given point in time. This is called____? |
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| the number of times that a waves aqmplitude cycles from its starting point, through its highest amplitude and its lowest amplitude, and back to its starting point over a fixed period of time. |
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cycles per second. This is what defines frequency |
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What does phase refer to? |
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The progress of a wave over time in relationship to a fixed point. |
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Wavelength is the distance between corresponding points on a waves cycle. |
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| Noise is any type of interference that may degrade a signal. |
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What are digital signals? |
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Definition
Composed of pulses of precise, positive voltages and zero voltages. |
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| Is is the term used by networking professionals to describe the nondata information that must accompnay data for a signal to be properly routed and interpreted by the network. |
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A modem is a device that functions as a modulator/demodulator. It modulates digital signals into analog signals at the transmitting end, then demodulates analog signals into digital signals at the receiving end. |
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A simple wave called a carrier wave is combined with another analog signal to produce a unique signal that gets transmitted from one node to another. Used in FM(frequency modulation) |
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| Frequency modulation. In which data much travel along a particular frequency. (Radio) |
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| The amplitude of the carrier signal is modified by the application of the data signal. |
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| When signals may travel in only one direction |
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What is half-duplex transmission? |
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| signals may travel in both directions over a medium but in only one direction at a time. |
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What does full-duplex mean? Sometimes called simple duplex or bidirectional transmission. |
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Definition
| Signals are free to travel in both directions over a medium simultaneously. |
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| It is a distinct communciation path between nodes, much as a lane is a distinct transportation path on a freeway. |
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A form of transmission that allows multiple signals to travel simultanelously over one medium is known as ____________? |
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To carry multiple signals, the medium's channel is logically separeted into multiple smaller channels called_______. (referring to mulitplexxing) |
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| A required device that combines multiple signals into one channel at the sending end is called a _______ |
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| A required device that combines multiple signals into one channel at the recieving end is called a _______ |
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| Time Division Multiplexing, it divides the channel into multiple intervals of time, or time slots. |
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What is statistical multiplexing? |
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Definition
| Is similar to time divisoon miltiplexing but rather than assigning a separate slot to each node in succession the transmitter assigns slots to nodes according to priority and need. |
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| Wavelength division multiplexing is a technology used with fiber-optic cable. uses one fiber-optic connection to carry multiple light signals simultaneously. |
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(Dense Wavelength Division Multiplexing) A single fiber in a fiber-optic cable can carry between 80 and 160 channels. Most modern fiber optic network. |
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| What is point-to-point transmission? |
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Definition
| When a data transmission involves only one transmitter and only one reciever it is considered point to point. |
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What does broadcast mean? |
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Definition
| Broadcast involves one transmitter and multiple recivers. For example, a tv station sends its signal to thousands of users. |
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Definition
| Sending multiple video broadcasts to multiple nodes. |
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What does throughput, capacity and bandwidth mean? |
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| Throughput is the measure of how much data is transmitted during a given period of time. It may also be called capacity or bandwidth. |
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Definition
| It is the measure of the difference between the highest and lowest frequencies that a medium can transmit. |
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| It is the form of transmission in which signals are modulated as radio frequency analog waves that use different frequency ranges. |
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| Electromagnetic interference. |
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| Radio Frequency Interference. This is caused by radio waves. |
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| It occurs when a signal traveling on one wire or cable infringes on the singal traveling over an adjacent wire or cable. |
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| Loss of a signal or strength. |
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| Electronic device that increases voltage or strength. |
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A device that regenerates a digital signal. |
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| When digital signals are repeated they are actually retransmitted in their original form without the noise they may have accumulated previously. This is called regeneration. |
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| Latency is referred to as delay. Time it takes to get from one place to another. |
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Term
What is a populated segment? |
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Definition
| It is part of a network that contains end nodes. |
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Term
What is an unpopulated segment? |
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Definition
| Also known as a link segment, it is part of the network that does not contain any end nodes, but simply connects two networking devices such as hubs. |
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Is a peice of hardware that enables networks or segments running on different media to interconnect and exchange signals. |
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| A device that transmits and recieves signals. It is also known as a media converter. |
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What is conduit or pipeline? |
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Definition
Use to help further protect and ward off interference of noise caused by possible EMI or maybe RMI. |
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