CONTENTS

Annex
 1 Introduction
 2 Wideband modems
        2.1 Direct Sequence Spread Spectrum (DSSS) approach
        2.2 Single-channel approach
        2.3 Multichannel approach
                  2.3.1 Independent Sideband (ISB) operation
                  2.3.2 Contiguous multichannel HF Equipment
                  2.3.3 Non-contiguous Multichannel HF equipment
        2.4 Digital Radio Mondiale (DRM)
 3 Networked systems
        3.1 AGILE HF networks
 4 Multicast technologies
        4.1 Time Division Multiple Access (TDMA)
        4.2 Carrier Sense Multiple Access (CSMA)
        4.3 Token Passing Protocols
                  4.3.1 HF Token Ring
                  4.3.2 HF Token Ring Mesh Networks
                  4.3.3 HF ALE Mesh Network
 5 Summary
Attachment  to the Annex  Characteristics for advanced digital radiocommunication systems, such as ISB, contiguous and non-contiguous channels operating in the 2-30 MHz