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A certain Beijing subway E1 protection common‑line ring transmission system
Release date:
2026-02-07
1 Overview
Through discussions with technical personnel from a Beijing subway operator and leveraging our design and R&D expertise in rail‑transit private‑network communications, we have proposed a co‑line ring transmission system solution for the subway’s power‑and‑environment monitoring data, featuring E1‑link protection. This solution ensures rational and comprehensive system configuration while addressing specific requirements related to service scale, network architecture, maintenance and management, security controls, and emergency response, while also accounting for the future continuity and scalability of services and applications.
2 Solutions
This project comprises one central station and eleven remote stations. Each remote station and the central station are equipped with one ZMUX‑3036 intelligent PCM multiplexing device. Each ZMUX‑3036 provides a single RS‑422 data channel for environmental‑monitoring telemetry, and the system is configured into an E1 ring network, enabling shared‑line communication of RS‑422 environmental‑monitoring data between each remote station and the central station, as well as E1 ring‑network protection functionality.
RS422 data is transmitted from the central station and received by the remote stations: The central station’s ZMUX‑3036 duplicates a single RS422 channel into two RS422 channels, which are then cross‑connected to the first and second E1 interfaces of the ZMUX‑3036. These two E1 links (in both directions) carry the data to each remote station. At each remote station, the ZMUX‑3036 receives the RS422 data sent from the central station over the two E1 paths, thereby enabling E1 ring‑network protection. If one E1 link fails, traffic can seamlessly switch to the other E1 link, ensuring high‑availability and reliable RS422 service.
As shown in the figure below:
RS422 data is transmitted from the remote stations and received at the central station: Each remote station’s ZMUX‑3036 duplicates a single RS422 channel into two RS422 channels, which are then cross‑connected to the first and second E1 interfaces of the ZMUX‑3036. The duplicated signals are carried over two E1 links (in both directions) to the central station. Upon receiving the RS422 data from each remote station via the two E1 links, the central station’s ZMUX‑3036 implements E1 ring‑network protection: if one E1 link fails, traffic can be switched to the other link, thereby ensuring high‑availability and reliable operation of the RS422 service.
As shown in the figure below:
The ZMUX-3036 is a multifunctional, intelligent integrated service access device that cross‑connects and multiplexes various types of service signals—such as voice, audio, data, and video—into 1 to 4 E1 interfaces for point‑to‑point or point‑to‑multipoint transmission.
The ZMUX-3036 provides four E1 interfaces and supports full‑timeslot cross‑connection for all four E1 ports. Each E1 port can serve as an uplink, carrying a variety of services. Flexible configuration of transmission protection modes is available among the four E1 ports, supporting 1+1 protection, N:M protection, and more. The device features comprehensive network management capabilities, enabling efficient management and maintenance of the entire network.
The ZMUX-3036 features a modular design, offering 32 universal service slots and 4 Ethernet slots. It can be fully configured to meet the customer’s specific service requirements and quantities, effectively functioning as a tailor-made solution. The device supports easy capacity expansion, efficiently accommodating both current business needs and future growth, thereby providing customers with a cost-effective and highly efficient solution.
The ZMUX-3036 delivers stable and reliable performance, supporting various network topologies such as star, tree, and chain configurations. With numerous successful deployments for key private‑network customers, it has been widely adopted across industries including airports, power, maritime, military, railways, mining, oilfields, government, and large corporate groups, earning widespread recognition and acclaim from users.
Features:
Compact footprint: utilizes a 19-inch 1U chassis.
E1 protection function: Supports multiple protection modes, including 1+1 and N:M for E1 lines.
4E1 Cross-Connect: Optional 4‑channel E1 full‑timeslot cross‑connect.
Modular Design: Offers 32 universal module slots and 4 dedicated Ethernet slots.
A wide range of service types: optional FXO/FXS, 2‑wire/4‑wire E&M, asynchronous/synchronous RS‑232, asynchronous/synchronous RS‑422, RS‑485, 10BASE‑T, V.21/V.22, V.24, V.34, digital I/O, CAN bus, magneto‑telephone, hotline telephone, V.35, G.703 64k in the same direction, and other service modules.
Flexible configuration: The service modules support mixed insertion, allowing fully customized assembly to meet customer requirements and providing a one-stop solution for comprehensive business communication functions.
Safe and Reliable: Each service module corresponds to a single user interface, with each module operating completely independently, ensuring that failures do not affect one another.
Dual-power protection: Optional 1+1 dual-power input protection.
Centralized Monitoring System: Optional network management functionality enables monitoring of network-wide device configuration information, fiber‑optic and E1 link status, fiber‑optic and E1 protection status, user interface status, and more.
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