Application of Communication Command and Dispatch Machine in Highway and High speed Railway Construction Site

Application of Communication Command and Dispatch Machine in Highway and High speed Railway Construction Site

1.                      Current situation and problems:

With the grand plan of the national "the Belt and Road" and the establishment of the "Asian Investment Bank", the construction scale of infrastructure such as expressways and high-speed railways will be greatly accelerated.

These construction sites are generally temporary buildings, mostly in remote areas with poor communication conditions. There are many construction sites along the route, with a large number of construction personnel involved and a need for coordination. They often operate in various hazardous environments. In tunnel caves, walkie talkies cannot function effectively and require the use of telephones, wired intercom systems, etc. It is also possible to achieve positioning inside the cave by arranging WIFI access points reasonably.

In case of emergency, departments such as fire, public security, health, and electricity will also participate, which requires each department to take into account the coordination work of other departments. If frequent switching of walkie talkie channels is not feasible, some units' wireless intercoms are not in the same frequency range or not of the same standard. Such as 350M frequency band, 800M frequency band, air-to-air communication frequency band, etc. Sometimes leaders also need to use GSM mobile phones and landline phones to understand and command on-site work.

The best solution is to build a wired and wireless dispatch system for each construction area, integrating all wireless communication intercom, fixed telephones, GSM telephones, even broadcasting, display screens, video cameras, GPS location information, etc. in the same dispatch system.

Due to the generally remote location of construction sites, the communication resources of operators in these areas are limited, and the communication bandwidth is generally not high. When establishing a scheduling system, it is recommended to have one's own communication system that comprehensively solves telephone, intercom, network, and video solutions. Ruiguang Jiyuan's scheduling communication is a system that integrates scheduling, communication access, communication transmission, and video transmission. It has both fiber optic transmission and wireless transmission, reducing the user's maintenance threshold and making system integration easier. IDM G3CP and IDM M9000 are scheduling devices with transmission interfaces such as SDH.

The scheduling systems in different regions can network with each other, which means they can not only work independently but also work collaboratively.

2.                      Requirement:

Multiple wireless cluster radio stations, especially those with different frequency bands and standards, need to be equipped for on-site command personnel. These radio stations should be linked together through a scheduling machine, and the operation of the scheduling machine should be used to monitor, command, and merge clusters of various radio stations.

The same scheduling machine can be configured with a set of scheduling machines for each department (i.e. the same frequency point). Considering the complexity of the site, operators may not be familiar with computers, so it is best to configure a Danish key scheduling machine without a computer. If there is a communication vehicle on site, touch screen dispatch console, audio and video dispatch, etc. can be configured. Through the dispatch console, one can hear the voices of individual users in this group as well as the collaborative processes of other groups they care about. They can choose to set up settings at any time, which is flexible and convenient. 

GSM/CDMA SIM cards or 4G communication cards can also be configured on the dispatch machine to maintain communication with the outside world.

Voice recording devices can also be installed to record the entire on-site voice.

A comprehensive scheduling system can also bind video signals to achieve the coordination of voice and data. It can also synchronize with geographic location information and display the location information of the scheduled object simultaneously.

3.                      Application system:

The following figure is an example of an on-site scheduling system application.

(1) Introduction to the functions of IDM M9000 communication command and dispatch machine:

The IDM M9000 in the figure can insert 12 access service disks,

If a radio interface card is inserted, a maximum of 4 radio stations (clusters) can be connected to each card;

If a SIM card is inserted, 8 calls (FXO or FXS) can be made;

If a GSM/CDMA SIM card is inserted, two SIM cards for mobile phones can be connected.

The WG300 processing disk has an IP telephone gateway function, which can realize the interconnection of simulated voice services to IP (compliant with SIP standard VOIP protocol), and can achieve scheduling and data storage on IP.

The central processing disk WG300 also has TDM based telephone exchange function. The voice service on IDM M9000 can be exchanged through program-controlled telephone exchange, with the number of users and relay ports interchangeable, and a total capacity of 120 channels.

The central processing disk WG300 has multi-party voice conferences, which can allocate conference rooms for cluster radio stations and IDM MCC keyboard dispatch stations, thereby achieving flexible multi-party communication functions.

The central processing disk WG300 also has E1 based digital signaling extension function, which can realize the conversion of China No.1, China No.7, PRI signaling, etc.

（2）Introduction to IDM MCC Dispatch Console Functions:

IDM MCC is an IP keyboard dispatch console without a computer system. It can be connected to IDM M9000 through an Ethernet switch and has flexible installation locations. Built in 10W loudspeaker, can be deployed through any IP channel, easy to use.

There are 5 sets of corresponding buttons for radio stations on IDM MCC (corresponding relationships can be set).

Listening function: When listening to the selected radio station, the corresponding indicator light displays the color of the listening status. If there is sound in the radio cluster of the channel, the speaker will have amplification output, and the corresponding channel indicator light will flash.

Speech function: If a channel allows speech (adjustable), the speech indicator light for that channel will be on. Press the group send button at this time, and the sound in the microphone will be broadcasted in all allowed clusters.

If stronger scheduling capabilities are needed, coordination between the scheduling server and the touch screen scheduling console is required.

(3) IDM NTD421 is a link network optical transceiver that can be directly connected to IDM M9000 scheduler, providing access to networks, telephones, data, and more. More suitable for use during tunnel construction.

If larger Ethernet bandwidth is required, IDM GTD 442 link network devices can be used.

If there is no traditional telephone service, IDM POE-M8 Ethernet gigabit fiber optic transceiver can be used. This device has POE power supply function, which is convenient for terminal access, such as POE powered WIFI routers, POE powered network cameras, and so on. The total power supply capacity of IDM POE-M8 is 150W. If there is no demand for POE power supply, the price and cost of this device can be greatly reduced.