Wavelength division multiple access protocols ppt

 

 

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Flexible Access: Networks allow their users to access files from computers throughout the network. Sharing of Information: Computer networks enable us to share data and information with the computers that are located geographically large distance apart. • Multiple access protocols and LANs. - Channel Partitioning - "Taking turns" - Random Access. Cyclic Redundancy Check (CRC): Division. • Generator polynomial G(x) = x16+x12+x5+1 • Let the whole frame (D+EDC) be polynomial T(x). 5.1/33. Wavelength-Division Multiple Access. In fiber-optic communications, wavelength-division multiplexing (WDM) is a technology which multiplexes a number of optical carrier signals onto a single optical fiber by using different wavelengths (i.e., colors) of laser light. Wavelength Division Multiple Access Protocols. A passive star connection in a fiber optics network. Wavelength Division Multiple Access Protocols. Πρωτόκολλα για Ασύρματα Τοπικά Δίκτ�α. Provided are a wavelength division multiple access (WDMA) central station, a WDMA user interface, and an optical layer connection service method in an The WDMA optical network has a distributed structure in which the respective user stations individually perform the MAC protocol, and thus it has Code division multiple access (CDMA) is a modulation and multiple-access scheme based on spread-spectrum communication. In this scheme, multiple users share the same frequency band at the same time, by spreading the spectrum of their transmitted signals, so that each user's signal is Additional information on multiple access techniques • Orthogonal and non-orthogonal multiple access. • Minimize protocol overhead to improve scalability, reduce power consumption, and increase Frequency Division Multiple Access. Forward Error Correction Fast Fourier Transform. Multiple Access Protocols ALOHA Carrier Sense Multiple Access Protocols Collision-Free Protocols Limited-Contention Protocols Wavelength Division Multiple Access Protocols Wireless LAN Protocols. Multiple Access protocols. ˆ single shared broadcast channel ˆ two or more simultaneous transmissions by nodes: interference. Channel Partitioning MAC protocols: TDMA. TDMA: time division multiple access. ˆ access to channel in "rounds" ˆ each station gets fixed length slot 2. Space Division Multiple Access (SDMA). • Channels are assigned on the basis of ―space‖ (but operate on same frequency). Carrier Sense Multiple Access Protocols (CSMA). • In this each terminal on the network is able to monitor the status of the channel before transmitting information. For wavelength division multiple access (WDMA) net-works, diverse media access control (MAC) protocols have been introduced to achieve the efficient packet service in MAC sub-layer. In this paper modified accelerative pre-allocation WDMA (MAP-WDMA) MAC protocol for chan-nel limited Q. 23. Differentiate between wavelength division multiple access protocols and limitedcontention protocols.Ans.Wave length division multiple In this protocol, WDMA each station is assigned twochannels.A narrow channel is provided as a control channel to signal the station and a wide Q. 23. Differentiate between wavelength division multiple access protocols and limitedcontention protocols.Ans.Wave length division multiple In this protocol, WDMA each station is assigned twochannels.A narrow channel is provided as a control channel to signal the station and a wide Frequency-division multiple access is the oldest of all multiple access schemes, and was used in the first demand assignment system for satellites (i.e In frequency-division multiple access (FDMA), the available channel bandwidth is divided into many nonoverlapping frequency bands, where each band Wavelength division multiple access (WDMA) as a technique for achieving very high capacity local area networks (LANs) is introduced. New efficient WDMA demand assignment protocols suitable for operation in such a high speed environment are presented and their performances are investigated

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