Itu-t rec. G. 957 (06/99) Optical interfaces for equipments and systems relating to the synchronous digital hierarchy
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Recommendation G.957 (06/99) iv Page Annex B – Measurement of the mask of the eye diagram of the optical transmit signal......... 20 B.1 Measurement set-up .................................................................................................... 20 B.2 Transfer function of the optical reference receiver ..................................................... 20 Appendix I – Methods for measuring reflections..................................................................... 22 I.1 Optical continuous-wave reflectometer ...................................................................... 22 I.2 Optical time-domain reflectometer ............................................................................. 23 Appendix II – Implementation of the Consecutive Identical Digit (CID) immunity measurement ............................................................................................................... 24 II.1 Introduction................................................................................................................. 24 II.2 Method ........................................................................................................................ 25 Appendix III – Possible method for evaluating aging margin contribution in receiver sensitivity specifications ............................................................................................. 26 III.1 Receiver sensitivity and eye opening.......................................................................... 26 III.2 S/X test method ........................................................................................................... 27 Appendix IV – Upgradability examples................................................................................... 29 IV.1 Example 1 ................................................................................................................... 29 IV.2 Example 2 ................................................................................................................... 29 |