PVDL is a fully portable implementation of the physical and link layers of VDL Mode 2 - the VHF Data Link as specified by the ICAO SARPS and ARINC Characteristic 631 and 750. PVDL actively tests and passively monitors VDL Mode 2 systems’ behaviour and performance.

The PVDL System consists of two principal entities:

• Hardware: Mini-VDR, Power VHF Transmitter, VHF Receiver
• Software : PVDL Ground Station & Aircraft Software

As an alternative to the PVDL engineering style tool, ADS has developed a Multi-Protocol Ramp Test set (MPRT) which is designed to provide go-no-go testing of aircraft installed communications systems, such as ACARS and VDL Mode 2. In addition to testing the communications protocols, the MPRT also provides the capability to confirm connectivity through to onboard peripherals such as printers and CDU's.

Hardware

At 50mW RF output power, the Mini-VDR can be viewed as a signal generator/analyser or as a low power VDL transceiver. For applications requiring greater range or for permanent ground stations the Power Transmitter can be configured to provide up to 80 watts of transmit power. The tuning range of both these devices actually covers the full aviation VHF band from 108 - 137Mhz. For VDL Mode 2, its use can be restricted to 118 - 137Mhz. The Navigation Band frequencies enable the system to be used in GNSS LAAS system applications.

PVDL - Portable VDL Software

The PVDL software loads onto any Win2K or WinNT PC. This software accommodates the DLE and VME software layers in accordance with AVLC protocols. Operational emulation of the higher network layers is also included. Versions are available that emulate either an Aircraft or a Ground Station.

MVDL - Mobile VDL Test System

The MVDL integrates the Mini-VDR into a ramp test set style case for fully portable/mobile operation. The MVDL includes the operating PC plus batteries and power supplies.

The MVDL enables the testing and diagnostics to be performed where the action is - for example at the ground station site or at the aircraft test location.