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Concentrator vs Multiplexer-Difference between Concentrator and Multiplexer

This page on Concentrator vs Multiplexer describes difference between Concentrator and Multiplexer.



A multiplexer is a combination circuit which will have more than one input lines, selection lines and one output line. It selects one input line and directs the data to the output line. This selection is done based on information on selection lines. For Example: 4X1MUX as shown in the figure. As shown in the multiplexer truth table, based on input information on selection lines(s1,s0), input lines are routed to the output port.

Selection line(s1,s0) output line
00 I0
01 I1
10 I2
11 I3



Concentration is used in circuit switched systems. It is typically used in access network part. As shown in the figure-2, traffic from n channel links is concentrated on a single m channel link, where m < n.

Outgoing link should be dimensioned such that the call blocking probability is small enough. This is taken care based on QoS requirement of the system. It is also a device that acts as an efficient forwarder of data transmission signals. EXAMPLE: A remote access Hub
Another example of concentrator is VPN 3000 series from Cisco.

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