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20 Cards in this Set
- Front
- Back
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Bandwidth |
A measure of the capacity of the communication channel down which the data is being sent. Relates to the range of frequencies available on the carrier wave (difference between the upper and lower frequencies). The greater the range of frequencies the larger the amount of data that can be sent in one frame. |
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Bit Rate |
The rate at which data is being transmitted in bits per second.
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Baud Rate |
Represents the number of electronic changes per second. One bit is usually sent on each state change, however it is possible to send more than one bit per state change by using different voltage levels to represent the bits. |
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Latency |
The time delay that occurs when transmitting data between devices. Propagation Latency: The amount of time taken for a logic gate within the circuit to transmit the data Transmission Latency: The time taken for the data to pass through a particular communication medium (e.g. copper wire/ fibre optics) Processing Latency: The time taken for data to pass around a network depending on how many servers or devices it has to pass through |
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Asynchronous Data Transmission |
Data is transmitted between two devices that do not share a common clock signal. It synchronizes only for the duration of the duration of the transmission by sending start and stop bits. |
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Synchronous data transmission |
Data is transmitted where the pulse of the clock sending and receiving device are in sync. The devices may share a common clock. No start or stop bits are required. |
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Start bit |
Causes the receiver to synchronize its clock to the same rate as the sender. |
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Stop bit |
Indicates that the data has arrived so the processor on the receiver's device can now handle those bits. |
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TCP/IP |
Two protocols that relate to the set or rules that govern the transmission of data around the internet. Handles the touting and re-assembly of data packets. |
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HTTP |
Hyper Text transfer Protocol: A set of rules that governs the exchanging of different types of file that make ups displayable web pages. |
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FTP |
File Transfer Protocol: A protocol for handling file uploads and downloads. |
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Network Interface Card |
A card that enables devices to connect to a network |
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Wireless Router |
Receives every packet of data being transmitted, reads the header of the packet and then forwards it to its destination. Acts as a firewall, preventing certain packets from being forwarded. Acts as a switch, creating a connection between two devices on a network. Provides a wireless access point transmitting a WiFi signal. Acts as a modem to convert digital signals to analogue so that they can be transmitted down standard telephone cables. |
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Peer-to-peer |
A network methodology where all devices in a network share resources between them. No one computer is in overall control of the network. |
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WWAN |
Wireless wide area network that uses radio waves for data transmission. Does away with the need for costly cabling. |
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MAC Address |
Media Access Control Address: A unique identifier encoded into the network interface card used to identify a particular device on a network. |
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CSMA/CA |
Carrier Sense Multiple Access with Collision Avoidance: Before a device sends data, the device uses this protocol to see whether the transmission medium is idle. If so the data are sent, otherwise the device will try again later. each device will then wait a random amount of time before attempting to send the data again. This reduces the chances of the devices trying to send simultaneously again. |
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RTS/CTS |
Ready to send/Clear to send: The RTS sends a message to the receiving node and if the CTS message is received, it knows the node is idle and that the data frame can be sent.
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SSID |
Service Set Identifier: A locally unique 32-character code put into the header of each packet of data being sent. Ensures the data is transmitted round the correct network. |
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WPA/WPA2 |
An encryption protocol for use on wireless networks |
