FOREWORD

Standards and Recommended Practices (SARPs) for very high frequency (VHF) digital link (VDL) Modes 1 and 2 were developed by the Aeronautical Mobile Communications Panel (AMCP) and introduced in Annex 10, Aeronautical Telecommunications, Volumes III and V in 1997 as a part of Amendment 72 to the Annex. References to VDL Mode 1 were removed from the Annex as part of Amendment 76 to Annex 10. The VDL system provides air-ground subnetwork services within the aeronautical telecommunication network (ATN).

During the development of the VDL SARPs and validation activities, the AMCP produced the material contained in this manual.

The purpose of the manual is to provide guidance when implementing VDL Mode 2. This manual is to be used in conjunction with the relevant provisions in Annex 10, Volumes III and V.