GL Communications Enhances ATM Voice Network Testing Solutions

GAITHERSBURG, Md., Sept. 23, 2026 /CourierPR/ -- GL Communications Inc. has unveiled its comprehensive suite of Voice over Internet Protocol (VoIP) test, analysis, and monitoring solutions for Air Traffic Management (ATM) voice networks. The solutions are designed for Controller Working Positions (CWP), Ground Radio Stations (GRS), Voice Communication Systems (VCS), radios, recorders, and gateways, and support interoperability and performance validation and assessment of ED-137 and ED-138 requirements.

As voice systems transition from Time-Division Multiplexing (TDM) to IP-based networks, differences in packetization, jitter buffers, voice processing, and switching can affect voice quality and delay. GL’s test solutions emulate, verify, monitor, and measure critical Air-to-Ground and Ground-to-Ground communications across Analog, TDM, and IP networks before deployment and during operation. The company stays aligned with evolving ED-137 and ED-138 updates and supports full IPv6 operation for modern ATM networks.

The Message Automation & Protocol Simulation (MAPS™) platform from GL Communications provides a unified environment for ED-137 interface testing, including Radio, Telephone, and Recorder interfaces. It supports functional, interoperability, regression, load, and stress testing. MAPS™ can generate bulk calls and SIP, SDP, and RTP traffic, create custom and negative test scenarios, generate voice, tones, and DTMF, introduce delay, jitter, packet loss, and packet duplication, support unicast and multicast operation, and automate testing through scripting and Python APIs.

MAPS™ ED-137 Radio emulates CWP and GRS entities for Air-to-Ground communication, supporting PTT, priority handling, multicast RTP, SELCAL, Radio Management Messages, and Maintenance Messages. MAPS™ ED-137 Telephone supports Ground-to-Ground calls between CWPs, including Instantaneous, Direct, Indirect, and General Purpose calls, along with Hold, Transfer, Pickup, Conferencing, emergency, and priority call handling. FAA Addendums 2, 4, and 5 are also supported.

MAPS™ ED-137 Recorder emulates Recorder, CWP, and Radio endpoints for Air-to-Ground and Ground-to-Ground recording sessions, with capabilities to record, replay, and analyze VoIP audio and metadata. The Radio, Telephone, and Recorder emulators support ED-137B and ED-137C, including Change 1 and Change 2 features, and are validated against the EUROCAE VOTER tool.

For ED-138 monitoring and ATM network visibility, PacketScan™ captures, decodes, and analyzes SIP, SDP, and RTP traffic for ED-137 interfaces. It provides call-level analysis of MOS, R-Factor, packet loss, jitter, delay, and RTP streams for live or recorded traffic. NetSurveyorWeb™ provides centralized web-based surveillance using one or more PacketScan™ probes, with real-time dashboards, alarms, historical reports, search, filters, event correlation, and multi-probe data aggregation for distributed ATM networks.

For critical voice-path measurements, GL’s Timing Measurements in Air Traffic Management (TM-ATM) solution identifies, captures, timestamps, and correlates signaling, control, and voice events across Analog, TDM, and IP interfaces. It also supports 2-wire and 4-wire legacy interfaces for timing and voice quality assessment. TM-ATM measures PTT activation, confirmation, and release, Squelch and receiver activity, main and standby switching, and end-to-end voice-path delay, while PESQ and POLQA are supported for voice quality assessment.

TM-ATM uses a central system for test automation, scheduling, and consolidating results; a Packet Analyzer for GPS-based timestamping, wirespeed filtering, and TTL measurements; an Audio Analyzer for PTT and audio simulation, voice quality scoring, and waveform analysis; a Discrete Signal Logger for capturing PTT, Squelch, and transfer signals; and an Event Data Logger for collecting timestamped events and reporting them to the central system. The solution is available in rack-mounted and portable configurations for laboratory validation, field commissioning, and live-site troubleshooting.

Together, GL’s ATM solutions provide an integrated test ecosystem spanning ED-137 interface emulation, ED-138 monitoring, protocol and interoperability testing, centralized network surveillance, critical delay measurement, and voice quality assessment, providing the tools needed to validate ATM voice networks throughout development, deployment, and operation.