• CCITT Rec. O.22 (11/1988) – CCITT AUTOMATIC TRANSMISSION MEASURING AND SIGNALLING TESTING EQUIPMENT ATME No. 2
  • 1 General
  • 2 Kinds of measurements and tests
  • 3 Equipment for making transmission measurements and processing the results
    • 3.1 Absolute power level measurements
    • 3.2 Noise measurements
    • 3.3 Signal-to-total-distortion ratio measurements
    • 3.4 Echo canceller testing system (ECTS)
    • 3.5 Digital loopback tests
    • 3.6 Adjustment results
    • 3.7 Recording and presentation of output
    • 3.8 Remeasurement and retest arrangements
  • 4 Method of access
    • 4.1 In general, access arrangements will conform to Recommendation M.560 [3].
    • 4.2 Outgoing international exchange
    • 4.3 Incoming international exchange
  • 5 Operating principles
  • 6 Signalling system testing and transmission measuring procedure-director to responder
    • 6.1 Establishment of connection and signalling test sequence
    • 6.2 Busy flash test
    • 6.3 Transmission measuring procedure and exchange of information between directing and responding equipments
    • 6.4 Description of transmission measuring cycles
    • 6.5 End-of-programme procedure
    • 6.6 Description of Layer 2 transmission measuring cycles
    • 6.7 Description of echo canceller testing cycles
    • 6.8 Echo canceller test timing and error considerations
    • 6.9 Responder digital loopback test
    • 6.10 System supervision
  • 7 Description of tests to digital loopback test lines
    • 7.1 ...
    • 7.2 Analogue tests on all circuit types
    • 7.3 Digital tests on wholly digital circuits
  • 8 Programming
  • 9 Specifications for transmission measuring apparatus and for disabling tones and locking tones
    • 9.1 Absolute power level measuring device
    • 9.2 Noise and total distortion measuring apparatus
    • 9.3 Disabling and locking tones
    • 9.4 ECTS sending apparatus of the directing and responding equipment
    • 9.5 ECTS receiving apparatus of the directing and responding equipment
    • 9.6 ECTS command signals exchanged between the directing equipment and the responding equipment
    • 9.7 Digital pattern generator and detector
    • 9.8 Test pattern detector
  • 10 Calibration
    • 10.1 Built-in calibration
    • 10.2 Self-check
  • 11 Optional arrangements
    • 11.1 Automatic start
    • 11.2 Timed automatic selection of particular circuits or groups of circuits
    • 11.3 Automatic repeat attempt
    • 11.4 Switching pad test
    • 11.5 Interruption and instability during level measurements
    • 11.6 Nonavailability of responding equipment
  • ANNEX A (to Recommendation O.22) Sensitivity of the signalling receiver