Overview

GL Communications offers a complete ED-137 VoIP test and monitoring solution for Air Traffic Services Ground Voice Networks (AGVN). The solution simulates and tests communication between key components such as Controller Working Positions (CWPs) and Ground Radio Stations (GRSs). Based on EUROCAE ED-137 standards, it supports Ground-to-Ground and Air-to-Ground call flows, including features such as Push-To-Talk (PTT), Squelch, Call Transfer, and Priority Calls. This helps ensure reliable communication and performance in real-world air traffic environments.

GL’s PacketScan™ is a real-time monitoring and protocol analysis tool for IP-based networks. It supports ED-137 and ED-138 standards, capturing and analyzing live signaling and voice traffic over IPv4 and IPv6. PacketScan™ monitors a wide range of traffic types (voice, tones, digits, video, and fax) and measures voice quality parameters including Mean Opinion Score (MOS), jitter, delay, packet loss, duplicate packets, and out-of-sequence packets.

In Air-to-Ground calls, each PTT or Squelch action is treated as a separate session, generating fresh voice quality statistics for every transmission. Its GUI provides easy-to-read Summary and Detail views with protocol ladder diagrams and supports RTP header extension decoding and R2S Keep Alive monitoring per ED-137 specifications.

Multiple PacketScan™ probes can be deployed across the network to capture call activity at various locations. These probes forward Call Detail Records (CDRs) to a centralized database, accessible through GL’s NetSurveyorWeb™ system. This setup enables users to monitor performance, troubleshoot issues, and ensure that air traffic communication systems meet strict safety and quality standards. The solution is ideal for Air Navigation Service Providers (ANSPs), equipment vendors, and system integrators involved in air traffic communication.

Benefits

• Ensures reliability – Validates critical Air-Ground and Ground-Ground communications
• Improves safety – Monitors PTT/Squelch timing and voice quality for compliance with ED-137
• Accelerates troubleshooting – Provides real-time analysis and protocol ladders to quickly locate issues
• Supports scalability – Multiple probes with centralized reporting handle large, distributed networks
• Enhances visibility – Offers clear dashboards, CDRs, and performance trends through NetSurveyorWeb™
• Assures quality of service – Measures MOS, jitter, delay, and loss to maintain communication standards
• Reduces downtime – Early detection of anomalies prevents service disruptions in air traffic operations

Use Cases

• Air-to-Ground communication validation – Monitor and analyze calls between Controller Working Positions (CWPs) and Ground Radio Stations (GRSs), including PTT and Squelch events
• Ground-to-Ground call monitoring – Verify signaling, call transfer, and priority call handling between ATC centers
• Recorder verification – Check ED-137 Recorder sessions (via RTSP) to ensure accurate voice and metadata capture for compliance and investigations
• Voice quality assurance – Measure MOS, jitter, delay, and packet loss for every PTT session to maintain operational standards
• Network troubleshooting – Identify issues such as packet loss, out-of-sequence packets, or signaling failures in live Air Traffic Services Ground Voice Networks (AGVN)
• Multi-site surveillance – Deploy probes at different locations to monitor distributed networks, with centralized reporting in NetSurveyorWeb™
• Compliance testing – Validate equipment and systems against ED-137/ED-138 requirements for ANSPs and vendors
• Load and performance monitoring – Track system performance during high traffic volumes to ensure stability under peak conditions