A link local or non-local can be characterized as if it were a transmission line. Before a link is enlarged for transport, it is essentially a very long (in the link's dimension), very narrow transmission line that transmits quantum entanglement. If a narrow enough pulse is created with the spin-two drive it should be able to find any discontinuities in what is essentially the link impedance, which indicates a point of bending or an endpoint. Just like a time domain reflectometer characterizes a transmission line.
However, the speed with which a signal is injected and an echo signal returned is several orders of magnitude faster than time domain reflectometry. Normal TDR pulses are in the range of picoseconds in duration; link TDR is in the range of yoctoseconds. Ten thousand times faster.
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