WALKIE-TALKIE

1 System Design

1.1 Scope of Works

The scope of the project includes the design, manufacturing, supply, transportation, installation, commissioning, trial operation, training, and warranty maintenance of ground and underground wireless communication systems

1) Build a ground and underground wireless communication system to complete voice and data transmission, and achieve seamless integration with the mine wired network, providing network access services for the later automation system

2) The underground wireless communication system is connected to the mine administrative and scheduling communication systems, and can provide network services for the mine hazard platform management software

1.2 System composition and structure

Ground wireless communication

Configure intelligent IoT substations at key locations on the ground, equipped with wireless antennas to achieve wireless coverage on the ground

Underground wireless communication

Set up wireless base stations for mining in the main underground tunnels, with supporting power supply and backup power supply, to achieve wireless coverage of key areas

The main convergence point is to add an intrinsically safe gigabit gateway, which is connected to the existing mine industrial ring network through optical cables

Configure mining intrinsically safe mobile phones to connect to underground wireless networks

System Platform

Adopting a large and efficient voice platform, it is interconnected with ground wireless, underground wireless, mine programmable scheduling, external administrative, etc

The main structural diagram is as follows:

In the above figure, the existing system equipment of the mining area along the industrial ring network is shown

1.3 Distribution of underground base stations

Based on the underground mining roadway map, wireless base stations for mining are configured in data aggregation areas and key safety areas. The overall distribution of base stations is as follows:

2 System advantages

With the continuous increase of intelligent hardware, the online demand for high bandwidth, large quantity, mobility, and adaptability to complex environments has become the driving force for the development of wireless network technology. In the past five years, Mesh technology

It is also constantly evolving. The main direction of technological evolution is to solve the problem of multi hop mesh performance degradation caused by the development of wireless mesh with scale and complexity. For example, bandwidth reduction and wireless interference

Disturbance and network latency. For example, in a network, the throughput of each hop will decrease by up to 50%, and in the case of continuous multiple hops, the throughput will decrease more rapidly, resulting in severe network performance

Reduce. In the case of a large number of voice and video applications running, latency and RF interference will reach an unacceptable level, leading to complete connection interruption

The STRINGLINK cable solution adopts multi module, multi RF, and multi-channel technology, effectively solving the problem of multi hop performance in wireless Mesh, far superior to single module and dual module Mesh

The solution reduces throughput by 50% per hop

Traditional single module Mesh and dual module Mesh networks can only provide limited scalability, and the inherent challenges of multi hop make it problematic for deploying multi node networks. Therefore, a new approach is needed

A structured wireless networking method that provides high performance and reliability in its network regardless of the number of hops

In order to be implementable, wireless multi node networks must be low latency networks that provide separate wireless bandwidth links for node uplink and node downlink backhaul traffic (similar to full duplex connections)

And automatically use high available throughput. For example, the STRINGLINK cable system adopts a multi frequency, multi-channel, and multi RF module networking method. The low latency network of STRINGLINK cable has

A large number of long-term tests were conducted in both laboratory environments (without noise) and real environments (with noise). The number of test hops gradually increased from 1 to 10, and the results showed that even if 10 hops were reached, there was no noise situation

Under normal circumstances, only 2% of the network's backhaul throughput is lost, while only 20% is lost in actual noisy environments. The delay test results are also satisfactory - all in voice (VoIP) and video applications are accessible

Within the scope of acceptance. The bandwidth degradation test results were compared with the good performance of using a single frequency Mesh network for backhaul traffic. And single mode Mesh or dual mode Mesh networks in the absence of noise

After 5 hops, the bandwidth will be surprisingly lost by 80%

The STRINGLINK cable solution adopts the standard 802.11X protocol, multi-module, multi-mode, multi-RF, and multi-channel technology, effectively solving the problem of wireless mesh multi-hop performance, far superior

The throughput of the Mesh solution decreases by 50% per hop and the performance drops sharply due to co frequency networking

STRINGLINK cable technology can quickly connect objects wirelessly and directly using standard protocols, endowing objects with the ability to act as network nodes, forming a decentralized network between objects

Line local area network, and evenly distribute wireless signals around objects (similar to AP). This distributed connection and access method can break through the limitations of the environment, reduce IoT costs, and improve the network

The carrying capacity extends the boundaries of the network

Several keywords of STRINGLINK cable technology: standard protocol, multiple modules and modes, active joining

The technical value of STRINGLINK cable technology:

Solve the deployment issues of existing solutions, save time and effort, and break through environmental limitations

Meet future challenges and form a distributed high-speed IoT intelligent front-end

Multi module STRINGLINK cable scheme - structured wireless intelligent networking nodes

In the STRINGLINK cable scheme, there are two options based on different needs:

1. High bandwidth mode: Each network node uses at least three dedicated wireless link interfaces, with one module for client access, the second module for uplink wireless backhaul traffic, and the third module for downlink wireless backhaul traffic. This wireless network solution can provide 866Mbps connection between nodes and 300Mbps client access

2. Ordinary low-cost mode: Each network node uses at least two dedicated wireless link interfaces, with one module used for client access and uplink wireless backhaul traffic, and the second module used for downlink wireless backhaul traffic. This wireless network solution can provide 300Mbps connection between nodes and 300Mbps client access

STRINGLINK Wire Rope Technology Verification

Provide separate wireless bandwidth links (full duplex connections) for node uplink and node downlink backhaul traffic, and automatically utilize high available throughput. This low latency network has undergone extensive long-term testing in both laboratory environments (without noise) and real environments (with noise). The number of test hops gradually increased from 1 hop to 10 hops, and the results showed that even when reaching 10 hops, only 2% of the network's backhaul throughput was lost without noise, while only 20% was lost in actual noisy environments. In actual noisy environments, the delay test results are 15ms per level

Multi hop large-scale wireless intelligent networks are highly sensitive to issues such as bandwidth reduction, wireless interference, and network latency. If multi frequency structured STRINGLINK cable wireless technology is not used, the throughput per hop may decrease by up to 50%. Especially in larger scale deployments, network latency and roaming are also important considerations. In a wide area, high utilization environment, latency and bandwidth issues will become unacceptable

Choosing single module, dual module, or even some multi module Mesh networks will result in reduced network performance, poor scalability, and inability to support large-scale and high-density applications

Obviously, a new type of wireless intelligent network is needed to solve the problem of multi hop, which is also one of the supporting foundations of the Internet of Things. This new type of network requires the use of an intelligent wireless IoT network system that is modular, multi-mode, multi-frequency, multi-channel, and multi-RF with STRINGLINK cables

3 System Features

The industry's most stable and efficient two-layer networking protocol avoids multiple issues such as slow automatic networking speed, slow network topology convergence, and high protocol load in MESH networking protocol. The performance and network convergence characteristics are superior to the three-layer Mesh networking protocol

High performance wireless network with multiple hops, automatic channels, and sectors:

STRINGLINK technology base station equipment, with a single base station supporting 2.4GHz/5.8Hz and supporting the installation of other frequency band devices, can be used for wireless interconnection of devices and user wireless coverage at will

Multi module technology. The STRINGLINK base station supports up to 3 modes of non overlapping stacking configuration, with high capacity

Strong multi hop networking ability. The STRINGLINK base station ensures that the bandwidth loss of the wireless network per hop is less than 3%, the data delay loss is less than 20ms, and supports wireless networking with more than 15 hops

The maximum distance for a single hop can reach 10 kilometers, providing a stable bandwidth of 8Mbps after 5 kilometers. (Note: Depending on the antenna performance, the values will vary accordingly)

When the STRINGLINK base station supports the use of multi sector networking technology (3 sectors, 6 sectors, etc.), it can fully allocate the bandwidth resources of fiber optic points to the wireless network

The fully transparent link capability separates the address management of application layer devices from that of the STRINGLINK base station, effectively utilizing network resources, enhancing network security, and balancing redundant backups for load

Anti interference capability:

Utilize the intelligent frequency scanning and multi frequency planning capabilities of the STRINGLINK device to avoid interference issues within wireless smart network systems. Cooperate with sector and directional antenna to reduce the chance of external interference in networking and coverage

Automatic repair capability and automatic performance tuning capability:

Adopting two-layer technology for networking, distributed intelligence quickly establishes topology and converges the network. The automatic repair capability and automatic performance adjustment of STRONGLINK network are far superior to the three-layer mesh networking protocol. Each base station establishes the connection direction according to the weighted average of signal strength, link quality, hops, performance, delay and other parameters, and performs self-healing and automatic link performance adjustment according to the network reachability and link indicators. Network self-healing or link switching will not cause user business restructuring, and switching is fully transparent to users

Spatial multi-level networking:

The STRINGLINK network forms a three-dimensional and hierarchical distributed wireless network architecture

For example:

Convergence layer of wireless building roof height

Distribution layer of lamp pole height along the street

Access layers for roads, residential areas, parks, hotspots, and indoor areas

Make full use of the installation positions at different heights such as the building roof and lamp pole, and cooperate with different types of antennas - omnidirectional antenna, plate antenna, sector antenna, parabolic antenna, etc. to realize wireless equipment interconnection and network coverage

Greater networking flexibility and multi-level networking can be achieved by selecting the corresponding external antenna and adjusting the vertical angle of the antenna

Universality:

Any IP type device or device can be directly connected to the STRINGLINK module through an IP-based interface, without the need to develop any driver and application programs, to achieve wireless and interconnection of the device

For example, if the network port of a wired IP CAMERA is directly connected to the STRINGLINK module, the wired IP CAMERA is immediately converted into a wireless IP CAMERA, which can be directly connected to any 2.4G/5.8GHz AP, or even connected to another IP CAMERA object of the same STRINGLINK module

Versatility:

1. The on-site near end signal extends to the far end, with high bandwidth coverage throughout the entire process

Support all wired, all wireless, and wired wireless hybrid networking to solve on-site wiring construction problems

Resolve adverse signal conditions caused by on-site obstruction or changes in conditions

Possess on-site network intelligent disaster recovery capability. Increase the robustness of the network

High speed movement and fast switching support:

Supports fast switching at a speed of 80 kilometers per hour, meeting the transmission of video, voice, and data services during high-speed mobility

Security:

The STRINGLINK network adopts a unique mandatory encryption method to achieve link security between STRINGLINK base stations. Ensure the privacy of network data

Multiple security mechanisms for user access

Manageability:

A unified network management system that spans three layers of networks can be configured in batches and in a unified manner for the entire network, subnet, and device levels. Support multiple functions such as events and alarms