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Business Data Communications 4e
... Access with Collision Avoidance) similar to CSMA/CD by Ethernet. Two methods are simultaneously used: ...
... Access with Collision Avoidance) similar to CSMA/CD by Ethernet. Two methods are simultaneously used: ...
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... signals to a higher level without disturbing human ears. • With wireless networks, the air medium supports the propagation of radio and light waves that travel from one point to another. ...
... signals to a higher level without disturbing human ears. • With wireless networks, the air medium supports the propagation of radio and light waves that travel from one point to another. ...
Circuit Switching
... devices on either end of the call. On the other end, a signal is sent to your friend's ATA, telling it to ask the connected phone to ring. 6. Once your friend picks up the phone, a session is established between your computer and your friend's computer. This means that each system knows to expect pa ...
... devices on either end of the call. On the other end, a signal is sent to your friend's ATA, telling it to ask the connected phone to ring. 6. Once your friend picks up the phone, a session is established between your computer and your friend's computer. This means that each system knows to expect pa ...
phys-layer-interface..
... character was ‘framed’ with start-stop bits • Synchronous transmission involves collecting characters into blocks and ‘framing’ each block. • Does not involve extra start-stop bits • But, may involve special characters or special strings to delimit each block • Hence, transmission are synchronized o ...
... character was ‘framed’ with start-stop bits • Synchronous transmission involves collecting characters into blocks and ‘framing’ each block. • Does not involve extra start-stop bits • But, may involve special characters or special strings to delimit each block • Hence, transmission are synchronized o ...
relaycard-sdu - Sola/Hevi-Duty
... of the SDU UPS. If mounting on a separate chassis, the hole diameter for the relay box is 0.378 in. (3.5 mm). 2. Plug the 12 V dc power interconnection cable into the 12 V dc input of the relay box. Plug the other end of the power interconnection cable into the aux dc output (or Vout) of the SDU UPS ...
... of the SDU UPS. If mounting on a separate chassis, the hole diameter for the relay box is 0.378 in. (3.5 mm). 2. Plug the 12 V dc power interconnection cable into the 12 V dc input of the relay box. Plug the other end of the power interconnection cable into the aux dc output (or Vout) of the SDU UPS ...
Cable Testing and Cabling LANs and WANs
... Broadband transmission = • In general, broadband refers to telecommunication in which a wide band of frequencies is available to transmit information. • Because a wide band of frequencies is available, information can be multiplexed and sent on many different frequencies or channels within the band ...
... Broadband transmission = • In general, broadband refers to telecommunication in which a wide band of frequencies is available to transmit information. • Because a wide band of frequencies is available, information can be multiplexed and sent on many different frequencies or channels within the band ...
RF Transmission Lines and Antennas
... are familiar with that goes from our rig to our antenna. These have one conductor in the middle surrounded by an insulator which is surrounded by an outer braid which is surrounded by outside insulation. Coax cables are considered to be unbalanced as the outer conductor is intended to be held at gro ...
... are familiar with that goes from our rig to our antenna. These have one conductor in the middle surrounded by an insulator which is surrounded by an outer braid which is surrounded by outside insulation. Coax cables are considered to be unbalanced as the outer conductor is intended to be held at gro ...
Electrical Principles and Wiring Materials
... is overloaded the fuse will “blow” (the filament in the fuse will melt in two) The size of fuse used will depend on the size of wire that is being used in the circuit ...
... is overloaded the fuse will “blow” (the filament in the fuse will melt in two) The size of fuse used will depend on the size of wire that is being used in the circuit ...
Lesson 8
... Gateway – a gateway is an optional component in a H.323enabled network. When communication is required between different networks a gateway is needed at the interface. It provides data format translation, control signaling translation, audio and video codec translation, and call setup and terminatio ...
... Gateway – a gateway is an optional component in a H.323enabled network. When communication is required between different networks a gateway is needed at the interface. It provides data format translation, control signaling translation, audio and video codec translation, and call setup and terminatio ...
1 Communication Adapter 2
... the dot on the bottom right will be green and show “Communications OK”. If the dot is red and shows “No Communications”, verify the cables are connected properly. If there is still no communications then the Serial Port on your computer may not support the Communications Adapter. This can be correct ...
... the dot on the bottom right will be green and show “Communications OK”. If the dot is red and shows “No Communications”, verify the cables are connected properly. If there is still no communications then the Serial Port on your computer may not support the Communications Adapter. This can be correct ...
learning activity -2
... Today, English has been adopted by the whole world and was accepted as a world language. All issued information are translated into English and are published. The railway system sector is developing very fast. The highest using of technological developments has become an industry branch. Therefore, ...
... Today, English has been adopted by the whole world and was accepted as a world language. All issued information are translated into English and are published. The railway system sector is developing very fast. The highest using of technological developments has become an industry branch. Therefore, ...
Advanced Telecom Research Center
... communications and particularly for satellite communications because it allows for a dramatic range of power variations. Due to the high orbit of Geo Satellites path loss represents effective power reduction by many, many orders of magnitude. A decibel range on the basis of a logarithmic scale of 10 ...
... communications and particularly for satellite communications because it allows for a dramatic range of power variations. Due to the high orbit of Geo Satellites path loss represents effective power reduction by many, many orders of magnitude. A decibel range on the basis of a logarithmic scale of 10 ...
Electricity Unit Notes
... basis upon which electric motors operate Reverses the Polarity: reversing the direction of current flow Electromagnet- unit is called Commutator- reveres the current flow in an electric motor Armature- rotating magnet ...
... basis upon which electric motors operate Reverses the Polarity: reversing the direction of current flow Electromagnet- unit is called Commutator- reveres the current flow in an electric motor Armature- rotating magnet ...
William Stallings Data and Computer Communications
... Transfers information across communications network performing switching & routing Hides data transmission and switching ...
... Transfers information across communications network performing switching & routing Hides data transmission and switching ...
118 - Telecommunications Industry Association
... (VoIP) and how it may affect TTY transmissions. Recent advances in this technology have increased the overall voice quality to the point where some carriers are using it for voice traffic in the Public Switched Telephone Network, and many other carriers have publicly announced their plans to do so. ...
... (VoIP) and how it may affect TTY transmissions. Recent advances in this technology have increased the overall voice quality to the point where some carriers are using it for voice traffic in the Public Switched Telephone Network, and many other carriers have publicly announced their plans to do so. ...
Wireless Communications
... Scan Control Channels: Your cell phone needs to use the "closest" base station because that's the one with the strongest signal and the one that will give the best connection. To find the closest base station, your phone checks all 21 control channels and determines which has the strongest signal. C ...
... Scan Control Channels: Your cell phone needs to use the "closest" base station because that's the one with the strongest signal and the one that will give the best connection. To find the closest base station, your phone checks all 21 control channels and determines which has the strongest signal. C ...
Chapter 4: Communication Technology Solutions
... 6. The head of an organization decides to form a network using the guided media. In the guided media, one can connect various computers using cables. In such a situation, the problem is that he/ she does not have much knowledge about the networking cables. a. Explain him/her briefly about the netw ...
... 6. The head of an organization decides to form a network using the guided media. In the guided media, one can connect various computers using cables. In such a situation, the problem is that he/ she does not have much knowledge about the networking cables. a. Explain him/her briefly about the netw ...
learning outcomes
... Describe how the effect of a collision increases with the mass and the speed of the objects involved. State that the change in speed of an object increases with: (a) the size of the force acting (b) the time the force acts. State that the range of a ball thrown at an angle is affected by: (a) the sp ...
... Describe how the effect of a collision increases with the mass and the speed of the objects involved. State that the change in speed of an object increases with: (a) the size of the force acting (b) the time the force acts. State that the range of a ball thrown at an angle is affected by: (a) the sp ...
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... Owned by private company or it may be a service provided by public company ( such as local tel.-company) Extended over an entire city. May be single network such as a cable television network, or it may be connected number of LANs into a large network so that resources may be shared LAN-TO-LAN ...
... Owned by private company or it may be a service provided by public company ( such as local tel.-company) Extended over an entire city. May be single network such as a cable television network, or it may be connected number of LANs into a large network so that resources may be shared LAN-TO-LAN ...
Standards for multimedia communications
... • Application standards: provide users, through an appropriate interface, with access to a range of multimedia communication applications. • Network interface standards: different types of network operate in different modes and each type of network has a different set of standards for interfacing to ...
... • Application standards: provide users, through an appropriate interface, with access to a range of multimedia communication applications. • Network interface standards: different types of network operate in different modes and each type of network has a different set of standards for interfacing to ...
Wireless Media
... Wireless Propagation: Sky Wave Sky wave propagation is found in frequencies from 2MHz to 30MHz A sky wave signal bounces back and forth between the ionosphere and the earth surface ...
... Wireless Propagation: Sky Wave Sky wave propagation is found in frequencies from 2MHz to 30MHz A sky wave signal bounces back and forth between the ionosphere and the earth surface ...
Total Conversation through ITU
... to the mature public switched telephone network (PSTN) o Even so, a large number of telephone calls are carried over IP networks today o Unfortunately, multimedia communication services (the video and textual components) have been slower to “take off” 14-16 July 2003 ...
... to the mature public switched telephone network (PSTN) o Even so, a large number of telephone calls are carried over IP networks today o Unfortunately, multimedia communication services (the video and textual components) have been slower to “take off” 14-16 July 2003 ...
Total Conversation through ITU-T Standards
... to the mature public switched telephone network (PSTN) o Even so, a large number of telephone calls are carried over IP networks today o Unfortunately, multimedia communication services (the video and textual components) have been slower to “take off” 14-16 July 2003 ...
... to the mature public switched telephone network (PSTN) o Even so, a large number of telephone calls are carried over IP networks today o Unfortunately, multimedia communication services (the video and textual components) have been slower to “take off” 14-16 July 2003 ...
University of California at Berkeley College of Engineering
... constant, but when many things change suddenly (i.e. when the clock rises), a sudden burst of current is required. Together, inductance and capacitance make the wire behave as a transmission line, making signals travel along the wire rather than being instantly broadcast. This is unimportant at low ...
... constant, but when many things change suddenly (i.e. when the clock rises), a sudden burst of current is required. Together, inductance and capacitance make the wire behave as a transmission line, making signals travel along the wire rather than being instantly broadcast. This is unimportant at low ...
Fiber-Optic Cable
... be polished and precisely fused. All connections must be perfectly aligned and matched for core size, and must provide a completely light-tight seal. Metallic media connections, on the other hand, can be made by cutting and crimping using relatively unsophisticated tools. • Fragility. Glass fiber is ...
... be polished and precisely fused. All connections must be perfectly aligned and matched for core size, and must provide a completely light-tight seal. Metallic media connections, on the other hand, can be made by cutting and crimping using relatively unsophisticated tools. • Fragility. Glass fiber is ...
History of telecommunication
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The history of telecommunication began with the use of smoke signals and drums in Africa, the Americas and parts of Asia. In the 1790s, the first fixed semaphore systems emerged in Europe; however it was not until the 1830s that electrical telecommunication systems started to appear. This article details the history of telecommunication and the individuals who helped make telecommunication systems what they are today. The history of telecommunication is an important part of the larger history of communication.