SSH EN 301 841-1 V1.4.1:2015

VHF air-ground Digital Link (VDL) Mode 2; Technical characteristics and methods of measurement for ground-based equipment; Part 1: Physical layer and MAC sub-layer

Scope

The present document applies to VDL Mode 2 ground-air digital communications using Differential Eight Phase Shift
Keying (D8PSK), intended for channel increments of 25 kHz. The VDL Mode 2 system provides data communication
exchanges between aircraft and ground-based systems. The scope of the present document is limited to ground-based
stations.
The present document provides functional specifications for ground-based radio equipment intended to be used for
ground-air data communications. The present document is derived from the following documents:
• Annex 10 of the ICAO Convention on International Civil Aviation [1].
• ED 92B [i.2]: "MOPS for an Airborne VDL Mode-2 Transceiver Operating in the frequency range
118-136.975 MHz" (2012), which specifies the airborne transceiver.
The present document consists of two parts:
• the first part provides functional specifications and test procedures for physical layer and MAC sub-layer;
• the second part provides functional specifications and test procedures for link and sub-network access layers.