The optical conductor faces are carefully smoothened. The faces of the optical conductors must be precisely ground and polished to transmit the light with as little reflection as possible.
The relatively large optical conductor diameter of one millimetre, as prescribed by the TOS Link standard, produces significant reflections and phase shifts between
the individual light beams. This causes a kind of jitter, which makes it difficult for the receiver to detect ones and zeroes. The higher the quality of the optical conductor, the less light is reflected and the more precise the transmission.