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Try new ways to find cause of CCL delays

That the source of interfering signals on the Circle Line remains a mystery, despite the protracted, albeit sporadic, string of occurrences, is troubling (“Whole-day shutdown the latest twist in CCL mystery signal hunt”: Nov 5).

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Ronald Chan Wai Hong

That the source of interfering signals on the Circle Line remains a mystery, despite the protracted, albeit sporadic, string of occurrences, is troubling (“Whole-day shutdown the latest twist in CCL mystery signal hunt”: Nov 5).

It is commendable that a process of elimination is being undertaken to isolate the root of the disruptions, but there is a likelihood that the source may be of a stochastic nature, and the probability of recurrence may be low.

An exhaustive search may take weeks, if not months, to bear fruit. In the software validation and verification community, it is for this reason that manufactured solutions are instead used as test cases.

Here, corner and edge cases are deliberately constructed to identify erroneous behaviour and aid in fault rectification. Perhaps it is time to consider other approaches to identifying the cause of the disruptions.

For example, efforts could be directed towards precise, robust replication of the disruptions during maintenance hours using simulated telecommunication loads or by constructing other potential sources of interference.

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