IDM Field Wire Bus-type Ethernet Converged Communication System

I. System Description

The IDM Field Wire Bus-type Ethernet Converged Communication System is a new type of wired converged communication product series developed by our company, featuring simple operation, easy maintenance, rapid deployment, and mobile networking. The design of the IDM Field Wire Bus-type Ethernet Converged Communication System fully considers communication requirements in complex environments, providing a stable, reliable, and easily expandable communication solution through the use of field wire twisted pairs.

The product utilizes domestically innovative two-wire Ethernet interface technology, allowing up to 15 bus networking devices or intelligent terminals to be connected in parallel via a single field wire. A typical networking topology is shown in Figure 1 below.

Figure 1 Typical Networking

In the field wire bus converged communication system shown above, field wire terminals or devices can be directly connected to a single field wire. IP terminals can be connected via network adapters, and various voice terminals or communication terminals can be accessed through various gateway devices, forming an integrated converged communication command and dispatch system. Among them:

(1). The MCC6000 portable command dispatch switch, MCC600-T intelligent dispatch terminal, and ruggedized intelligent dispatch terminal all have built-in field wire adapter modules and can be directly connected via field wire, enabling communication and dispatch functions for other intelligent terminals, audio devices, and video terminals in the system;

(2). Field wire network adapters are used to connect network surveillance cameras, MCC500 intelligent dispatch terminals, etc., via IP Ethernet ports;

(3). Field wire voice gateways are used to connect traditional analog telephones via telephone lines;

(4). Field wire radio gateways are used to connect wireless radio intercom devices;

(5). Field wire common battery gateways are used to connect common battery telephones via telephone lines;

(6). Field wire broadcast gateways are used to connect broadcast terminals via audio interfaces.

The system can also achieve fiber interconnection with the command center and longer-distance transmission interconnection through field wire extension optical relay equipment, as shown in Figure 2 below.

Figure 2 Fiber Extension Networking

II. System Features and Advantages

(1). Random Access, Intelligent Networking, Simple Operation, Easy Maintenance

The two-wire Ethernet interface utilizes advanced digital signal processing technology, capable of echo cancellation for reflected clutter appearing on the field wire bus and polarity reversal for signals with reversed core wires. This allows users to use the two-wire Ethernet interface without concerning themselves with the position distribution of access points on the bus or distinguishing the positive/negative polarity of the bus. The two-wire Ethernet interface also incorporates a complete self-organizing network protocol. There is no master-slave relationship among bus networking devices; shutting down any one bus networking device does not affect the networking communication of other devices. In various application scenarios, devices are plug-and-play in their factory state, requiring no user modification or adjustment of internal parameters.

In battlefield environments, weapons, equipment, vehicles, and personnel may be subjected to enemy artillery attacks and destruction at any time. Combat-oriented requirements for information equipment demand good operability, maintainability, and reconfigurability. Through a series of technological innovations and improvements, bus networking devices have achieved the combat-oriented design goals of two-wire parallel connection, multi-point interconnection, out-of-the-box operation, and plug-and-play connectivity. As a comparison, SHDSL field wire extension equipment can only perform point-to-point communication connections on a single field wire. In multi-point networking applications, communication nodes have a master-slave relationship; when the master node is relocated, its corresponding slave nodes must be rewired. In contrast, the bus approach enables all user nodes to achieve mobile random access along the line.

(2). Long Communication Distance, High Transmission Rate, Strong Anti-interference Capability

Bus networking devices are available in 2 types: long-distance networking type and short-distance high-speed transmission type.

Among them, the long-distance networking type has a measured maximum communication distance of up to 10 km. When using Type 706 field wire for a 10 km point-to-point transmission test, the measured user bandwidth of the bus networking device can reach 2 Mbps.

Among them, the short-distance high-speed transmission type has a measured communication distance within 2 km. When using Type 706 field wire for a 2 km point-to-point transmission test, the measured user bandwidth of the bus networking device can reach 10 Mbps.

Bus networking devices adopt packet data transmission technology. Each time packet data is transmitted, the channel equalization coefficients are learned in real time, enabling the device to make timely adjustments and adaptations to strong external interference conditions. SHDSL field wire extension equipment requires a lengthy channel equalization training process at startup (maximum link establishment time exceeding 120 seconds). When the link is interrupted due to interference, the channel equalization training process must be repeated. In the oil well logging industry, shielded core wires are selected from multi-core cables for remote data transmission. In this case, the transmission wires are not twisted pairs and are susceptible to signal interference from other wires. In related comparative experiments, bus networking devices demonstrated better anti-interference characteristics than SHDSL transmission equipment.

(3). Supports Multiple Media Services, Core Services Avoid Congestion

Bus networking devices classify data transmitted on the bus into three priority levels based on service type: real-time control services are designated as high priority, real-time voice services as medium priority, and network video, file transfer, and other IP application services as low priority. Bus networking devices dynamically allocate bus bandwidth resources based on the priority level of transmitted data and limit the transmission bandwidth of each real-time control service to within 20 kbps. This ensures the real-time performance of high-priority services with low traffic volume, unaffected by low-priority network applications with high traffic demands and diverse service types.

The system supports the access of various voice and media terminals and devices, including voice, video, network terminals, audio terminals, and wireless terminals, and supports functions such as audio/video instant communication, video surveillance transmission, audio/video conferencing, and converged communication dispatch.

(4). Strong Scalability and Good Interoperability

Through the use of repeaters, multiple field wire buses can achieve configuration-free relay interconnection, forming linear or tree-shaped bus interconnection networks. After bus deployment is completed, all networking nodes can immediately join the network by simply connecting bus networking devices to the pre-deployed bus. Network nodes already on the network can autonomously withdraw and relocate to other bus-covered locations to rejoin the network. Bus networking devices automatically complete network parameter configuration changes without requiring network management scheduling or manual configuration.

Compared with field optical cables, field wire bus networking allows rapid tap-in connection at any time without requiring professional splicing tools. It is simple and quick to operate. Meanwhile, through fiber extension relay equipment, system expansion and interconnection are achieved.

III. Main Performance Specifications

(1). Maximum number of networking nodes on a single bus: 8;

(2). Long-distance transmission model: maximum bus span distance of 10 km, maximum bus user bandwidth up to 2 Mbps;

(3). High-speed transmission model: maximum bus user bandwidth up to 10 Mbps within a bus span distance of 2 km;

(4). Maximum delay for real-time voice data on the bus: 100 ms;

(5). Transmission efficiency for multi-point access on the bus: up to 80%;

(6). Packet loss probability for multi-point access on the bus: less than 0.1%;

(7). Average network access time for bus networking devices: less than 3 seconds;

(8). Maximum number of interconnected buses: 16.

IV. Main Application Scenarios

(1). Engineering Construction Sites (Tunnels, Railways)

(2). Emergency Rescue and Disaster Management Rapid Network Deployment

(3). System Networking for Oil and Gas Fields and Mining Operations

(4). Military and National Defense Exercise Site Networking

(5). Broadband Access and Networking for Temporary Security Zones

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