CONTENTS

 1     Scope
 2     Normative references
 3     Line signal structure
 4     Requirements to received signals frequency tolerance
 5     Transmitted power levels
 6     Modulation method and signal space diagram
 7     Data signalling and modulation rates
 8     Received signal conditions
 9     Interchange circuits
10     Synchronization
11     Special measures for raising modem immunity
12     Testing Facilities