TSIs can be used to resolve output port contention in time-multiplexed circuit switches. Each of the three input transmission frames contains 10 time slots. By means of three TSIs, resequence each of the inputs such that all conflicts are eliminated. A data source produces packets, each with an average length of 1kbyte. A Metropolitan Area Network is used to interconnect several Local Area Networks.
Traffic patterns are uniform.
Find the minimum data rate needed on the MAN such that 20 such LANs can be interconnected. This causes considerable overhead in packet switching. In circuit switching, a transparent circuit is established. No extra bits are needed. Therefore, there is no overhead in circuit switching.