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Doesn a 2 fiber bi-directional line switched ring waste 1/2 the line rate bandwidth?

April 26, 2017bandwidth Bi directional fiber line rate ring waste

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Doesn a 2 fiber bi-directional line switched ring waste 1/2 the line rate bandwidth?

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A. No. It can be shown that in all cases the aggregate bandwidth on a 2 fiber BDLSR is no less than the aggregate bandwidth on a path switched ring. In some cases that exemplify an inter-office transport ring it can actually be shown that the aggregate bandwidth of a 2 fiber BDLSR can be larger than that of a path switched ring (proof left to student). Q. What is the difference between TSA and TSI. A. Time Slot Assignment (TSA) allows for flexible assignment for add-dropped signals but not for through path signals. Once a signal is multiplexed onto a time slot it stays in that time slot until it is dropped. Time Slot Interchange is more flexible in that it allows a signal passing through a node to be placed in another time slot if desired. Equipment that provides neither TSA or TSI is said to be hard wired. This pass-through grooming, which is not supported by systems limited to time-slot assignment (TSA), allows in-transit bandwidth rearrangements for maximum facility utilization.