CONTENTS

 1     General
        1.1     Definition
        1.2     Location of protected monitoring points
        1.3     Use of protected monitoring points
        1.4     General electrical characteristics
 2     Electrical characteristics of protected monitoring points provided on transmission equipments of the plesiochronous digital hierarchy
        2.1     Impedances at the protected monitoring points
        2.2     Characteristics of monitoring points incorporated in transmission equipment
        2.3     Characteristics of monitoring points located between transmission equipments
 3     Electrical characteristics of protected monitoring points provided on transmission equipments of the synchronous digital hierarchy
        3.1     Impedances at the protected monitoring points
        3.2     Characteristics of monitoring points at 155 520 kbit/s incorporated in transmission equipment
        3.3     Characteristics of monitoring points at 155 520 kbit/s located between transmission equipments
        3.4     Other bit rates
 4     Protection of the transmitted signal
 5     Resilience of the protected monitoring point
References