IDM Field Twisted-Pair Bus Integrated Communication System

IDM Twisted-Pair Bus Integrated Communication System

I       System Description

The IDM Twisted-Pair Bus Integrated Communication System is a newly developed series of wired integrated communication products by our company. It features simple operation, easy maintenance, and the ability to be quickly deployed and networked on the move. The system is designed with the communication needs of complex environments in mind, providing a stable, reliable, and easily expandable communication solution using twisted-pair lines.

The product utilizes domestically developed dual-line Ethernet interface technology, allowing up to 15 bus network devices or smart terminals to be connected in parallel on a single twisted-pair line. A typical network is shown in Figure 1 below.

Figure 1: Typical Network

In the twisted-pair bus integrated communication system shown above, twisted-pair terminals or devices can be directly connected to the twisted-pair line. IP terminals can be connected through network adapters, and various voice or communication terminals can be accessed through different gateway devices, forming an integrated communication command and dispatch system. Specifically:

1). The MCC6000 portable command dispatch machine, MCC600-T smart dispatch terminal, and rugged smart dispatch terminal all have built-in twisted-pair adapter modules, allowing them to directly connect to the twisted-pair line. They can communicate and dispatch other smart terminals, audio devices, and video terminals within the system.

2). Twisted-pair network adapters are used to connect IP Ethernet ports to network surveillance cameras, MCC500 smart dispatch terminals, etc.

3).   Twisted-pair voice gateways are used to connect traditional analog telephones via telephone lines.

4).   Twisted-pair radio gateways connect to radio communication devices.

5).   Twisted-pair shared power gateways connect to shared power telephones via telephone lines.

6).   Twisted-pair broadcast gateways connect to broadcast terminals via audio interfaces.

The system can also achieve fiber-optic interconnection with the command center and longer-distance transmission interconnection through twisted-pair optical relay equipment, as shown in Figure 2.

Figure 2: Fiber Optic Relay Network

II       System Features and Advantages

(1).       Easy Access, Smart Networking, Simple Operation, and Convenient Maintenance

The dual-line Ethernet interface uses advanced digital signal processing technology to cancel echo from reflected clutter on the twisted-pair bus and reverse the polarity of signals with reversed core wires. This means that when using the dual-line Ethernet interface, users do not need to worry about the position distribution of access points on the bus or distinguish the polarity of the bus. The dual-line Ethernet interface also has a complete self-networking protocol built in. There is no master-slave relationship between bus network devices, and turning off any bus network device does not affect the network communication of other devices. In various applications, the devices are plug-and-play in their factory settings, requiring no user modifications or adjustments to internal parameters.

In battlefield environments, weapons, equipment, vehicles, and personnel may be subjected to enemy artillery attacks and damage at any time. The practical requirements for information equipment are that the devices must have good ease of operation, ease of maintenance, and reconfigurability. Through a series of technological innovations and improvements, the bus network devices have achieved the practical design goals of dual-line parallel connection, multi-point interconnection, plug-and-play, and instant connectivity. As a reference comparison, SHDSL twisted-pair remote transmission equipment can only perform point-to-point communication connections on a single twisted-pair line. In multi-point networking applications, communication nodes have a master-slave relationship, and after the master node is moved, the corresponding slave nodes must be rewired. The bus method allows all user nodes to join the network along the line on the move.

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

There are two types of bus network devices available: long-distance networking type and short-distance high-speed transmission type.

n For long-distance networking type equipment, the tested communication distance can reach up to 10 kilometers. When using 706-type twisted-pair for 10-kilometer point-to-point transmission tests, the tested bandwidth for bus network device users can reach up to 2 Mbps.

n  For short-distance high-speed transmission type equipment, the tested communication distance is within 2 kilometers. When using 706-type twisted-pair for 2-kilometer point-to-point transmission tests, the tested bandwidth for bus network device users can reach up to 10 Mbps.

Bus network devices use packet data transmission technology, and the channel equalization coefficient is learned in real-time with each data packet transmission, allowing the device to promptly adjust and adapt to strong external interference. SHDSL twisted-pair remote transmission equipment requires a long channel equalization training period during startup (the maximum link establishment time can exceed 120 seconds). If the link is interrupted due to interference, the channel equalization training process needs to be repeated. In the petroleum logging industry, where remote data transmission is required over multiple core cables, the transmission wire is not twisted-pair, making it susceptible to signal interference from other wires. In related comparative experiments, bus network devices demonstrated better anti-interference characteristics than SHDSL transmission equipment.

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

Bus network devices categorize the data transmitted on the bus into three priority levels based on service type:

u       Real-time control services are designated as high priority.

u       Real-time voice services are designated as medium priority.

u       Network video, file transfer, and other IP applications are designated as low priority.

Bus network devices dynamically allocate bus bandwidth resources based on the priority level of the transmitted data, and the transmission bandwidth of each real-time control service is limited to within 20 kbps. This ensures the real-time performance of high-priority services with small traffic volumes, preventing them from being affected by high-demand, multi-service low-priority network applications.

The system supports the access of various voice, media terminals, and devices, including voice, video, network terminals, audio terminals, and wireless terminals. It also supports instant voice and video communication, video surveillance transmission, audio and video conferencing, and integrated communication dispatching.

(4).       Strong Expandability, Good Interoperability

Using repeaters, multiple twisted-pair buses can be connected without configuration, forming a linear or tree-shaped bus interconnection network. After the bus is set up, all network nodes can join the network immediately by simply connecting the bus network device to the preset bus. Network nodes that have already joined the network can autonomously leave and move to other locations covered by the bus for re-networking. The bus network device automatically completes the configuration changes of network parameters, requiring no network management scheduling or manual configuration.

Compared to field optical cables, twisted-pair bus networking can be quickly and easily connected at any time without professional splicing tools, making it simple and fast to operate. System expansion and interconnection can also be achieved through optical relay equipment.

III       Main Performance Indicators

u  Maximum number of network nodes per bus: 8

u Long-distance transmission model: maximum bus span distance of 10 kilometers, maximum bandwidth for bus users up to 2 Mbps

u  High-speed transmission model: bus span distance within 2 kilometers, maximum bandwidth for bus users up to 10 Mbps

u   Maximum delay for real-time voice data on the bus: 100 ms

u   Transmission efficiency for multi-point access on the bus: up to 80%

u   Packet loss probability for multi-point access on the bus: less than 0.1%

u   Average network access time for bus network devices: less than 3 seconds

u   Maximum number of interconnected buses: 16

IV       Main Application Scenarios

u    Engineering construction sites (tunnels, railways)

u    Emergency rescue and disaster management rapid network setup

u    System networking for oilfields and mining operations

u    Military and defense exercise site networking

u    Temporary security zone broadband access and networking