receiving end.
Multiplexing refers to combining multiple data channels for transmission on a common medium. Demultiplexing refers to recovering the original separate channels from a multiplexed signal. Multiplexing and demultiplexing are performed by a Multiplexer (also called a Mux), which usually has both capabilities. Now time to know in detail, what are the FDM and TDM as described briefly earlier in this article.
FDM (Frequency-Division Multiplexing)
TDM (Time-Division Multiplexing)
FDM:
This technique works by converting all data channels to analog form. Each analog signal can be modulated by a separate frequency (called a carrier frequency) that makes it possible to recover that signal during the demultiplexing process. At the receiving end, the demultiplexor can select the desired carrier signal and use it to extract the data signal for that channel. FDM can be used in broadband LANs (a standard for Ethernet also exists). One advantage of FDM is that it supports bi-directional signaling on the same cable.
TDM:
Time-division multiplexing (TDM) divides a channel into time slots that are allocated to the data streams to be transmitted. If the sender and receiver agree on the time-slot assignments, the receiver can easily recover and reconstruct the original data streams. TDM transmits the multiplexed signal in baseband mode. Interestingly, this process makes it possible to multiplex a TDM multiplexed signal as one of the data channels on an FDM system. Conventional TDM equipment utilizes fixed-time divisions and allocates time to a channel, regardless of that channel's level of activity. If a channel isn't busy, its time slot isn't being fully utilized. Because the time divisions are programmed into the configurations of the multiplexors, this technique often is referred to as Synchronous TDM.
StatTDM:
If using the capacity of the data medium more efficiently is important, a more sophisticated technique, Statistical Time-Division Multiplexing (StatTDM), can be used. A stat-mux uses the time-slot technique but allocates time slots based on the traffic demand on the individual channels. For example, If the demand of Channel B is very high than others, Channel B will be allocated more time slots than others (i.e., Channel A, C, and D).
Multiplexing refers to combining multiple data channels for transmission on a common medium. Demultiplexing refers to recovering the original separate channels from a multiplexed signal. Multiplexing and demultiplexing are performed by a Multiplexer (also called a Mux), which usually has both capabilities. Now time to know in detail, what are the FDM and TDM as described briefly earlier in this article.
FDM (Frequency-Division Multiplexing)
TDM (Time-Division Multiplexing)
FDM:
This technique works by converting all data channels to analog form. Each analog signal can be modulated by a separate frequency (called a carrier frequency) that makes it possible to recover that signal during the demultiplexing process. At the receiving end, the demultiplexor can select the desired carrier signal and use it to extract the data signal for that channel. FDM can be used in broadband LANs (a standard for Ethernet also exists). One advantage of FDM is that it supports bi-directional signaling on the same cable.
TDM:
Time-division multiplexing (TDM) divides a channel into time slots that are allocated to the data streams to be transmitted. If the sender and receiver agree on the time-slot assignments, the receiver can easily recover and reconstruct the original data streams. TDM transmits the multiplexed signal in baseband mode. Interestingly, this process makes it possible to multiplex a TDM multiplexed signal as one of the data channels on an FDM system. Conventional TDM equipment utilizes fixed-time divisions and allocates time to a channel, regardless of that channel's level of activity. If a channel isn't busy, its time slot isn't being fully utilized. Because the time divisions are programmed into the configurations of the multiplexors, this technique often is referred to as Synchronous TDM.
StatTDM:
If using the capacity of the data medium more efficiently is important, a more sophisticated technique, Statistical Time-Division Multiplexing (StatTDM), can be used. A stat-mux uses the time-slot technique but allocates time slots based on the traffic demand on the individual channels. For example, If the demand of Channel B is very high than others, Channel B will be allocated more time slots than others (i.e., Channel A, C, and D).
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