O.81�:�Group-delay measuring equipment for telephone-type circuits

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O.81�:�Group-delay measuring equipment for telephone-type circuits �

Recommendation O.81

In force components
Number	Title	Status
O.81 (11/88) �	Group-delay measuring equipment for telephone-type circuits �	In force
O.81 Appendix I Erratum1 (06/00) �	�	In force
O.81 Appendix I (06/98) �	A measuring signal (multitone test signal) for fast measurement of amplitude and phase for telephone type circuits � Formerly published as Supplement 3.7 in the Blue Book (1988), Fascicle IV.4, and then renumbered on 26 June 1998 as Appendix I to ITU-T O.81 without further modification	In force

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