Remote video technology uses video conferencing. The video conferencing system will be integrated with the existing network numerical control system to create a good collaborative working environment through the perfect real-time multimedia interactive function of video conferencing. The text conversation system's text chat, electronic whiteboard and application sharing functions can be used as an extension of the network CNC remote monitoring and diagnostic function. In order to consider the compatibility of the system, different video conferencing system products should comply with international standards such as T.120, H.320, H.323 of the International Telecommunication Union (ITU).
The video conferencing system is embedded in the B/S network solution, which is connected between the manufacturing enterprises and between the manufacturing enterprise and the remote monitoring center through the ATM network. With the new MCU, the client can log in to the server where the MCU's web management software is installed through the browser, and then join the conference according to the authorization. The conference scheduling function of the management software can realize the function of the multi-point conference initiated by the user terminal, thereby facilitating the timely elimination of the fault of the numerical control machine tool. The implementation of the system is shown in Figure 3.
Figure 3 Schematic diagram of network numerical control remote monitoring structure
4 system equipment configuration
Video conferencing terminal: POLYCOM ViewStationMP. 1 Support H.323, can hold video conference on Internet/intranet, transmission speed up to 768kbps: 2 full-duplex digital audio, automatic background noise reduction and echo suppression: 3 automatic voice-activated tracking camera: 4 built-in web-based synthesis The demonstration system sends the presentation materials to the remote end: I use the language incentive switching mode in the multi-point conference to enable the participants to be in the actual conference environment and automatically switch the screen to the speaker.
Interactive whiteboard: SmartBoard. VTEL's products can easily establish a data network, realize file transfer and sharing, graphic display and file image storage in multi-point conferences. It allows the meeting party to easily exchange programs, make records, and make the discussion more complete. (The equipment can be equipped according to the specific needs of the company.)
Multipoint Control Unit (MCU): AccordMGC-100. 1 Carrier-class modular structure: 2 Built-in gateway function enables different networks of H.320 (ISDN, DDN), H.323 (LAN, Internet, Intranet) and H.310 (ATM) to run on one system: 3 multi-code The conversion, different protocols have different algorithms, frame rate, bandwidth requirements, must be converted: 4 dynamic split screen technology, can monitor multiple scenarios at the same time: 5 firewall solution technology, the standard firewall set by the enterprise does not support real-time video, The audio stream can effectively solve this kind of problem through the MGC-100.
5 key technologies implemented by the system
Multimedia communication protocol
The system adopts the H.323 protocol, which is a packet-based multimedia communication system, which defines the functional components of the terminals and devices of the multimedia services provided on the packet network, the communication process and the provision of sound, images and data on the packet network. The protocol required for communication. It accommodates packet switched networks that provide reliable transport (TCP) and unreliable transport (UDP) mechanisms. Support video conferencing on the INTERNET network, providing standards for interoperability of multimedia communication products on the INTERNET and INTRANET networks.
H.323 provides a variety of media encoding methods, such as G.711, G722, G728 and G.729 for audio, CIF and QCIF for video H.261 and all modes of H.263. Optional, the data transmission uses the T.123, T.126, T.125 protocols in the Y.120 series, and their different combinations provide multiple options for different quality transmission applications.
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