CONTENTS

 1     Scope
 2     References
 3     Standardized test sequences
 4     Properties of pseudo-random test sequences
        4.1     Measurements through scramblers
        4.2     Loss of sequence synchronization
        4.3     “Framed” measurements
        4.4     Jitter measurements
 5     Digital test sequences used in the O-Series Recommendations
        5.1     511-bit pseudo-random test sequence
        5.2     2047-bit pseudo-random test sequence
        5.3     32 767-bit pseudo-random test sequence
        5.4     1 048 575-bit pseudo-random test sequence
        5.5     1 048 575-bit pseudo-random test sequence with zero suppression
        5.6     8 388 607-bit pseudo-random test sequence
        5.7     536 870 911-bit pseudo-random test sequence
        5.8     2 147 483 647-bit pseudo-random test sequence
 6     Description of framed test sequences at different bit rates
        6.1     General
                  6.1.1     Testing digital demultiplexers
        6.2     Digital frames operating at bit rates of 1544 kbit/s
                  6.2.1     12 - Frame multiframe or superframe
                  6.2.2     24 - Frame multiframe or extended superframe
        6.3     Digital frames operating at bit rates of 2048 kbit/s
                  6.3.1     Frames without CRC-4 procedure and providing common channel signalling
                  6.3.2     Frames without CRC-4 procedure and providing channel associated signalling
                  6.3.3     Frames with CRC-4 procedure and providing channel associated signalling
        6.4     Digital frames operating at bit rates of 6312 kbit/s
        6.5     Digital frames operating at bit rates of 8448 kbit/s
        6.6     Digital frames operating at bit rates of 32 064 kbit/s
        6.7     Digital frames operating at bit rates of 34 368 kbit/s
        6.8     Digital frames operating at bit rates of 44 736 kbit/s
        6.9     Digital frames operating at bit rates of 97 728 kbit/s
       6.10     Digital frames operating at bit rates of 139 264 kbit/s
                 6.10.1     Digital frames operating at 139 264 kbit/s and multiplexing 34 368 kbit/s signals
                 6.10.2     Digital frames operating at 139 264 kbit/s and multiplexing 44 736 kbit/s signals
       6.11     Digital frames operating at STM-N bit rates
 7     Block-oriented error performance measurements
        7.1     Measurement of block errors
        7.2     Block sizes
                  7.2.1     Block sizes for out-of-service performance measurements on PDH systems
                  7.2.2     Block sizes for out-of-service performance measurements on SDH systems
                  7.2.3     Block sizes for performance measurements on cell-based systems
 8     Detection and clearance of AIS and LOS defects