• Identify characteristics that distinguish wireless transmission from wire-bound transmission
• Explain the architecture and access methods used in cellular net-works and services
• Understand the differences between wireless and wireline local loops
• Describe the most popular WLAN standards, including their advantages, disadvantages, and uses
12 comments:
Identify characteristics that distinguish wireless transmission from wire-bound transmission. Wire-bound uses electrical signals that are sent down copper, fiber ect. Wireless uses atmosphere.
Identify characteristics that distinguish wireless transmission from wire-bound transmission:
In wireless there is no need for cables, nodes move freely, it travels over the airwaves as an unguided medium.
1. Wire-bound technology uses fiber optic or utp cable to transfer data. Wireless transmission is refered to as an unguided medium, meaning the air or atmosphere does not provide a fixed path for the data to arrive at the destination. Just as with wire-bound transmission, wireless signals are formed in an electric current traveling along a conductor. The signal is sent to an antenna which emits the signal into the atmosphere. It keeps sending the signal until it has reached its destination. Another antenna accepts the signal and converts it back into current.
802.11 - The IEEE committee responsible for establishing radio frequency wireless network access standards.
802.11a - A WLAN access technology standard that uses multiple frequency bands in the 5 GHz frequency range and offers a maximum throughput of 54Mbps. By using the 5 GHz band it is less likely to suffer interference, but requires a greater density of access points.
802.11b - A WLAN access technology standard that uses direct sequence spread spectrum signaling in the 2.4 GHz band. provides a maximum of 11 Mbps throughput.
802.11g - A WLAN access technology standardized by the IEEE 802.11g working group that uses the 2.4 GHz band. provides a maximum throughput of 54 Mbps.
Bluetooth - A mobile wireless networking standard that uses direct sequence spread spectrum signaling in the 2.4 GHz band. provides a maximum throughput of less than 1 Mbps.
HomeRF - A wireless networking specification that also uses DSSS in the 2.4 GHz frequency band. provides a maximum of 10 Mbps throughput.
Some popular wireless standards are: 802.11b, 802.11g, and Bluetooth.
802.11b "WiFi" advantages are that you can connect to a wireless access point without having a wired connection. Some disadvantages are that 802.11b speeds are only 11 Mbps and the ranges is only a few hundred feet.
802.11g advantages are faster speeds up to 54 Mbps and can operate with 802.11b access point and also has a greater range.
Bluetooth
Advantages of bluetooth is ment to link communication devices in a small personal area network (PAN). Disadvantage is that the speed is less than 1 Mbps and device can be only 10 meters apart.
Wireless local loops are mainly used in areas where deploying copper local loops is cost prohibitive or physically imposible. WLLs also have allowed CLECs to build their own infrastucture without having to lease facilities from ILECs.
WLAN Standards
1.IEEE 802.11 2. IEEE 802.11b 3. 802.11g 4. 802.11a
Advantages: WLAN uses high-frequency radio waves.WLAN can bring a laptop to a patient, enter the patient's data, and save the data immediately to a centralized database.
Disadvantages:Growth is a lack of one, dominant standard.
Steve Jones Says:
Simply put WLAN is a data network that communicates using high-frequency radio waves instead of coaxial, twisted pair, or fiber cables like LAN's do.
The most popular standard used is IEEE 802.11, it is subdivided into other sub categories, a,b,g to name a few. a operates in the 5GHz range where the b and g operate in the 2.4Ghz range. a throughput is 54 Mbps where b, g capacity is 11 Mbps ti 54 Mbps.
In wireless transmission signals often travel without guidance. This allows the wireless signals to be transmitted and corrected differently from wire-bound.
With wire-bound signals, wireless signals originate from electrical current traveling through a conductor. The signal then travels from transmitter to antenna so it emits the signal, as electromagnetic waves to the atmosphere.
COMPARISON WLL
Good LOS component
Rician fading
Narrowbeam directed antennas
High Channel reuse
Simple design, constant channel
Low in-premises mobility only, easy access
Weather conditions effects
COMPARISON WIRELINE
No diffuse components
No fading
Expensive wires
Reuse Limited by wiring
Expensive to build and maintain
Low in-premises mobility, wiring of distant areas cumbersome
Very reliable
L. Campbell
Explain architure and access methods used in cellular network and service? Cellular network and service as with many other devices needed a technology advancement in many areas to produce a fesible but uncumbersome method of transfering a conversation to begin and later transfer data, rather than a market for the product. In a rapidly growing economy the invention of compact and high processing components for other services and the ones already in need, such as the two-way radio,frequencies and a starving market that desired to be more connected, no matter the circumstance or situation help bring along a need for such a device. Now the custom to name the movement in generation style so characterized by the quality of signal, the safety of the product, the security features, variations of usage, rapid connect/disconnect, and whatever else is mounted on for the next generation, I believe it's here to stay.
Bernardo
Wireless transmission is done through the air. It follows no fixed path. Wireless signals originate from electrical current traveling along a conductor as do wire-bound.
Wire-bound transmission, on the other hand, follows a media like UTP or fiber optic cable. It follows a fixed path. It also originates from electrical current.
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