Advanced ED-137 / ED-138 VoIP Test Solutions for Air Traffic Management

GL Communications provides a comprehensive suite of VoIP test, analysis, and monitoring solutions purpose-built for Air Traffic Management (ATM) systems. Designed to support Controller Working Positions (CWP), Ground Radio Stations (GRS), Voice Communication Systems (VCS), Recorders, Radios, and Gateways, these tools help ANSPs and OEMs ensure interoperability, reliability, and EUROCAE standards compliance across ED-137 and ED-138 interfaces. GL stays aligned with evolving ED-137/ED-138 updates and supports full IPv6 operation for modern ATM networks. Our solutions enable users to emulate, verify, monitor, and measure critical communication paths used in air-ground and ground-ground operations, ensuring seamless ATM VoIP deployment.

Air Traffic Management

MAPS™ – Unified Platform for ED-137 Interface Emulation

GL’s Message Automation & Protocol Simulation (MAPS™) provides a unified platform for ED-137 interface testing. Using a standard PC and NIC, MAPS™ can emulate ED-137 Radio, Telephone, and Recorder interfaces for end-to-end testing of ATM voice systems. MAPS™ provide engineers with a flexible, script-driven environment for functional, regression, and stress testing of ED-137 systems.

Key capabilities include:

  • Automated bulk call generation
  • Complete SIP and RTP signaling procedures
  • Custom and negative test scenarios
  • Message construction, editing, and troubleshooting
  • Audio generation: voice files, tones, DTMF
  • Impairments: delay, jitter, packet loss, duplication
  • Support for IPv4/IPv6, Unicast/Multicast
  • Testing across analog, TDM, and IP networks

ED-137 Interface Emulation and Testing

ED-137 Radio (Air-Ground Communication)

MAPS™ ED-137 Radio enables testing of Radio–CWP communication as defined in ED-137 Volume 1.

  • Emulates hundreds of Radios with independent parameters
  • Supports Push-To-Talk (PTT): Normal, Emergency, Priority Override
  • Multicast RTP streaming
  • Multicast RTP, SELCAL, Radio Management Messages (RMM), and Maintenance Messages (MAM)
  • Audio generation: tones, recorded voice, DTMF
  • Measurements: jitter, delay, media activation timing

ED-137 Telephone (Ground-Ground Communication)

MAPS™ ED-137 Telephone ED-137 Volume 2 (2B/2C) SIP-based voice communication.

  • Call types: Instantaneous (IA), Direct (DA), Indirect (IDA), General Purpose (GP)
  • Call control: Hold, Transfer, Pickup, Conferencing
  • Emergency and priority call handling
  • Configurable SIP traffic with audio payloads
  • IP features: IPv4/IPv6, UDP/TCP, IP spoofing
  • FAA Addendums 2, 4, and 5

ED-137 Recorder Interface

MAPS™ ED-137 Recorder supports ED-137 Volume 4 Recorder communication.

  • Emulates Recorder, CWP, and Radio endpoints
  • Generates bulk air-ground and ground-ground sessions
  • Records, replays, and analyzes VoIP audio and metadata
  • Suitable for design verification and integration testing

MAPS™ support ED-137B, ED-137C, and associated change notices. It has been validated against the EUROCAE VOTER tool to ensure conformance.


ED-138 Monitoring and Real-Time Analytics

PacketScan™ – Passive Monitoring for ATM VoIP

PacketScan™ provides real-time VoIP call capture, decode, and quality analysis for ED-137 interfaces. It offers:

  • MOS, jitter, delay, packet loss
  • RTP stream analysis
  • SIP/SDP message decoding
  • Live call monitoring for lab and field testing

NetSurveyorWeb™ – Centralized ED-138 Surveillance Platform

NetSurveyorWeb™ is a web-based platform for ED-138 monitoring, offering:

  • Real-time dashboards and alarms
  • Multi-probe data aggregation
  • Historical reporting and trend analysis
  • Search, filters, and event correlation

Ideal for large-scale ATM network visibility and performance tracking.


End-to-End Timing and Voice Quality Measurement

GL’s TM-ATM (Timing Measurements in Air Traffic Management) system provides precise validation of PTT, squelch, receiver activity, and voice transmission timing across Analog, TDM, and IP communication paths. The solution also supports all 4-wire and 2-wire legacy interfaces for comprehensive end-to-end timing and voice quality assessment.

Supports:

  • PTT activation and release timing
  • Squelch and receiver event timing
  • Main/Standby switching behavior
  • Voice path delay using PESQ/POLQA

TM-ATM Modules:

  • MAPS™ Administrator – automation, test scheduling, results consolidation
  • Packet Analyzer – GPS-based timestamping, wirespeed filtering, TTL measurements
  • Audio Analyzer – voice quality scoring and waveform analysis
  • Discrete Signal Logger – capture of PTT, Squelch, Transfer signals

TM-ATM supports both rack-mount and portable field hardware, making it suitable for laboratory validation and live-site troubleshooting.


Why ANSPs and OEMs Choose GL

  • Complete ED-137 /ED-138 test ecosystem
  • Supports ED-137 B/C revisions and Change Notices
  • Verified using EUROCAE VOTER
  • Real-time monitoring and analytics tools
  • Automation-ready MAPS™ frameworks
  • Backed by 35+ years of telecom test expertise

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