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MB-1 Marker Beacon and NDB-200 Non-Directional Beacon Communication Transmission System Solution
Release date:
2026-06-18
I. Project Background
The MB‑1 marker beacon and the NDB‑200 non‑directional beacon are critical ground‑based radio navigation systems at airports. The MB‑1 marker beacon provides aircraft with position and navigation information, while the NDB‑200 non‑directional beacon supplies bearing signals, enabling aircraft to accurately approach the airport area and execute landing maneuvers.
At present, the MB‑1 and NDB‑200 equipment at most airports still relies on copper‑cable links for signal transmission. Copper‑cable systems suffer from significant signal attenuation, poor electromagnetic interference immunity, and cumbersome maintenance. To ensure the stability and reliability of civil aviation navigation services, it is necessary to upgrade the existing copper‑cable infrastructure to multi‑link transmission solutions such as fiber optic, E1, or IP.
II. Functionalities of the Solution Implementation
This solution is based on a next-generation multi-service access and transmission platform. At both the remote station and the air traffic control building, one ZMUX-4102 multi-service access and transmission platform is deployed. The signals from the MB‑1 directional beacon and the NDB‑200 non‑directional beacon are connected to the equipment’s user interfaces, enabling stable long-distance transmission via fiber optic, E1, or IP links.
System Network Diagram:
Network Diagram of the MB-1 Marker Beacon and NDB-200 Non-Directional Beacon Communication Transmission System
The system can implement the following core functions:
- Beacon signal remote transmission: The MB-1 and NDB-200 navigation signals from the remote station are transmitted to the air traffic control building’s monitoring center in real time and without distortion.
- Multi-service integrated access: In addition to transmitting MB‑1 and NDB‑200 signals, the ZMUX‑4102 can simultaneously carry ADS‑B radar data, VHF communications, synchronized radar data, automated meteorological observation data, telex transmission data, weather radar data, ILS glide‑slope data, 10/100BASE‑T traffic, and a variety of other airport‑related services.
- Modular and Flexible Scalability: The device features two main control slots, two power supply slots, and six universal I/O service‑board slots, making expansion convenient.
- Multi-link transmission: Supports multiple transmission modes, including IP links, E1 links, fiber-optic links, STM‑1/STM‑4 lines, 4G wireless, and satellite.
III. Advantages and Features of the Plan
1. System-wide redundant protection, high reliability
The ZMUX-4102 provides comprehensive system-level redundancy protection:
- Dual-Master Control Protection: Two optional main control cross‑connect boards provide 1+1 redundancy. When the primary main control board fails, the standby board automatically takes over, ensuring uninterrupted service.
- Dual-power protection: Optional 1+1 dual‑power input protection provides redundant backup with two power supply boards. Both the central office equipment and the remote unit can be equipped with two fully independent power supply boards, enabling automatic primary‑to‑standby switching.
- System-wide redundancy: Hot‑standby protection is implemented across all components, including the working power supply, the main control circuit, the transmission link, and the service ports, to ensure the secure and reliable transmission of service signals.
2. Multi-link automatic protection for stable and reliable transmission
Supports automatic protection and transmission across three links: IP, E1, and fiber optic. The device continuously monitors the communication quality of each link and, upon failure of the primary link (e.g., an IP dedicated line), automatically switches to the backup E1 or fiber‑optic link. As long as at least one link remains operational, services can maintain normal connectivity. The three links can be connected from three distinct directions, providing spatial redundancy for disaster recovery.
3. Excellent transmission quality
Various transmission methods, including fiber optics, E1, and IP, effectively address the drawbacks of copper cables, such as significant signal attenuation and poor resistance to electromagnetic interference. The IP link interface supports features like transmission‑delay optimization, jitter‑buffering, and packet‑loss resilience, thereby enhancing transmission stability and reliability.
4. Flexible networking with diversified transmission methods
- Wired transmission: Optional IP circuits, E1 circuits, fiber optics, and STM-1/STM-4 lines.
- Wireless transmission: Optional wireless microwave and wireless bridge.
- It can form an SDH self-healing ring and also connect to carrier‑grade STM‑1/STM‑4 lines, enabling wide‑area service transmission.
5. Centralized Monitoring and Remote Management
Optional network management features enable automatic loading of device configuration information across the entire network, allow configuration of port parameters, and support loopback detection. It provides real-time monitoring of the operational status of all network devices, including power status, link status, and service status. The network management platform also supports online software upgrades for both local and remote devices.
6. Validation of Success Stories
This solution has been successfully implemented in multiple civil aviation projects, including those at Hainan Air Traffic Control, Tibet Air Traffic Control, and Hohhot.
IV. Overview of the Implementation Process and Principles
1. Implementation Process
- Preliminary Site Investigation: Conduct a survey of the existing transmission links between the remote station and the air traffic control building to determine the fiber-optic cable routing and identify available E1/IP transmission resources.
- Equipment Deployment: One ZMUX-4102 multi-service access transmission platform is installed at the remote station (on the MB-1/NDB-200 equipment side), and another is installed at the air traffic control building (on the monitoring center side).
- Signal Access: Connect the MB-1 marker beacon and the NDB-200 non‑directional beacon’s service signal cables to the corresponding IO service board interfaces on the ZMUX‑4102.
- Link Connection: Communication links between two ZMUX-4102 devices can be established via fiber optic, E1 lines, or IP networks, with the option to select either a single-link or multi-link redundancy mode based on site conditions.
- System Debugging: Complete equipment configuration, link testing, and channel validation; verify signal transmission quality to ensure normal system operation.
2. Operating Principle
The ZMUX-4102 employs MSTP (Multi‑Service Transport Platform) and PCM multiplexing technologies, making it a next‑generation multi‑service access and transport platform that meets the demands of IP‑based transport networks, wireless microwave systems, and future network evolution, while also supporting traditional E1 circuits and fiber‑optic networks. Its underlying principle is:
- At the remote station side, the ZMUX-4102 acquires and encodes the analog/digital signals from the MB-1 and NDB-200, converting them into standard digital signals.
- Multiple digital signals are multiplexed and transmitted over long distances to the air traffic control building via fiber-optic, E1, or IP links.
- On the air traffic control building side, the ZMUX-4102 performs demultiplexing and decoding on the received signals, reconstructs them into their original beacon signals, and forwards them to the monitoring terminal or downstream processing system.
The entire transmission process ensures high-fidelity, low-latency, and interference‑resistant delivery of beacon signals from the remote station to the air traffic control building. The system’s full redundancy—featuring dual master controllers and dual power supplies—provides a reliable communication backbone for the stable operation of the civil aviation navigation and surveillance system.
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