17-03-2011, 04:47 PM
PRESENTED BY:
Mustafa Ashurex,
Scott Hansen
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Overview
Multiplexing is sending multiple signals or streams of data on an information line at the same time in the form of a single, more complex signal and then separating the signals at the receiving end.
Inverse Multiplexing is combining multiple low speed streams of data to form a single higher-speed data stream. The sending and receiving ends use an inverse multiplexer with one high speed input stream.
Analog Transmission
Each signal is assigned a different frequency (sub-channel) within the main channel
Digital Transmission
Each data stream is put into a single signal by separating the signal into many segments, each with a very short duration. Each individual data stream is reassembled at the receiving end based on the timing.
Employs a buffer memory which temporarily stores the data during periods of peak traffic, allowing STDM to waste no high speed line time with inactive channels.
Fiber Optic Transmission
Multiple signals are carried together as separate wavelengths of light
Inverse Multiplexing
• Performs multiplexing at the network layer using the MP or MPP protocol.
• One data packet is send over the first channel, the next is send over the second channel, and so on, until all the packets are distributed over all the available channels.
• The receiving end adjusts for network-induced delay and reassembles the data packets into their proper order.
• Used in Telecommuting applications
• Provides load balancing
• Allows Scalability
• Performs multiplexing at the physical layer using the AIM and BONDING protocols.
• A data stream is sliced into portions, then the data steams are distributed over all the available circuits.
• The receiving end adjusts for network-induced delay and reassembles the data streams into their proper order.
• Used in Applications that require transparent digital circuits
– videoconferencing
– bulk file transfer applications
• Allows Scalability