The CCITT automatic transmissiori measuring and signalling testing equipment (ATME No. 2) is intended to make transmission measurements, echo canceller tests and signalling system functional tests2) on all categories of international circuits terminating in exchanges with 4-wire switching.
ITU-T O.22 FRENCH-1992 Referenced Document
ITU-T G.131 Talker echo and its control Study Group 12*， 2024-04-19 Update
ITU-T G.165 Echo Cancellers Study Group XV; 31 PP*， 1993-01-01 Update
ITU-T G.821 Error performance of an international digital connection operating at a bit rate below the primary rate and forming part of an Integrated Services Digital Network SERIES G: TRANSMISSION SYSTEMS AND MEDIA DIGITAL SYSTEMS AND NETWORKS Digital networks Quali*， 2024-04-19 Update
ITU-T M.560 International Telephone Circuits - Principles, Definitions and Relative Transmission Levels - General Maintenance Principles - Maintenance of International Transmission Systems and Telephone Circuits (Study Group IV) 4 pp
ITU-T M.565 Access Points for International Telephone Circuits - General Maintenance Principles - Maintenance of International Transmission Systems and Telephone Circuits (Study Group IV) 4 pp
ITU-T M.605 Routine Maintenance Schedule for International Public Telephony Circuits - General Maintenance Principles - Maintenance of International Transmission Systems and Telephone Circuits (Study Group IV) 9 pp
ITU-T O.11 Maintenance Access Lines - Specifications of Measuring Equipment (Study Group IV) 10 pp
ITU-T O.132 QUANTIZING DISTORTION MEASURING EQUIPMENT USING A SINUSOIDAL TEST SIGNAL
ITU-T O.133 EQUIPMENT FOR MEASURING THE PERFORMANCE OF PCM ENCODERS AND DECODERS Study Group IV*， 1993-03-01 Update
ITU-T O.152 ERROR PERFORMANCE MEASURING EQUIPMENT FOR BIT RATES OF 64 kbit/s AND N x 64 kbit/s Study Group IV
ITU-T O.153 Basic Parameters for the Measurement of Error Performance at Bit Rates Below the Primary Rate Study Group IV
ITU-T O.41 Psophometer for Use on Telephone-Type Circuits - Specifications for Measuring Equipment - Equipment for the Measurement of Analogue Parameters (Study Group 4) 17 pp [Superseded: ITU-T P.53]*， 1994-04-19 Update
ITU-T O.61 SIMPLE EQUIPMENT TO MEASURE INTERRUPTIONS ON TELEPHONE-TYPE CIRCUITS
ITU-T O.9 Measuring Arrangements to Assess the Degree of Unbalance About Earth - Series O: Specifications of Measuring Equipment General Study Group 4; 19 pp*， 1999-03-01 Update