Wireless video transmission refers to a monitoring system that uses radio waves to transmit video, sound, data, and other signals without wiring. Old APs and clients do not support video transmission on wireless networks, but 802.11n changes this There are two main concepts of wireless image transmission, that is, real-time video transmission. One is mobile transmission, that is, mobile communication, and the other is broadband transmission, which is broadband communication. 1. 802.11n solves some technical problems of Wi-Fi in processing video equipment applications. 11n is expected to cause explosive growth in the consumption of electronic video equipment, including set-top boxes, game consoles and media servers. Video directly benefits from 11n's higher throughput and greater coverage. For companies planning to deploy video on a wireless LAN, key 11n features to consider include 3x3 or 4x4 MIMO, channel bonding and SGI (increased throughput), A-MPDU, and blocking ACK (to reduce streaming overload ). Although the implementation methods of different vendors are different, transmission beamforming can also increase the rate in the range, thereby increasing the effective video throughput. 2. Antennas and spatial streams: Understand how many antennas your device has and how they are used. For example, the communication between a 3x3 AP and a 1x1 client is limited by the MCS value of the client-that is, 65Mbps or 150Mbps. Fortunately, these "extra" AP antennas can still be used for STBC or TxBF to increase the data rate they support. 3. Transmission rate: The video format and encoding method determine the throughput requirements, and therefore the minimum acceptable data transmission rate. For example, 480i60 QuickTIme video encoded in MPEG-4 format can be transmitted normally at 5Mbps, but 1080p30 HDTV encoded in MPEG-2 format requires a rate of 20Mbps. To determine video traffic requirements and verify that your Wi-Fi always meets their requirements. 4. WPA2-AES: In order to achieve higher security on the new WLAN, 11n prohibits the HT data rate when using WEP and TKIP to ensure related security. In order to avoid artificial restrictions, it is necessary to verify that all video clients support AES, and no video SSID is configured with WPA2-Mixed-Mode (eg, WPA2 and TKIP or AES). V. Channels: HD video benefits from bonded channels in the 5GHz band. However, even after buffering, the video is still prone to delay, so the video should be deployed on non-DFS channels. Some devices do not support channel binding; others do not support it well. If this becomes a problem, it is necessary to achieve load balancing on two 20MHz channels instead of concentrating them all into one bonded channel. Sixth, priority: similar to voice, WMM access level can also be used for video QoS. However, the contention law of video is very different from that of voice. You should allocate the best throughput to the video, but do n’t let the video “block†the channel. The video access level should be mapped to the 802.1p AP or the DSCP mark of the AP. 7. Fairness of bandwidth occupation time: WMM can give video traffic more bandwidth occupation time, but it will not help video clients share channels with other clients. Slower or farther routers take longer to transmit the same byte traffic, which reduces the transmission rate that 11n clients should have. In order to solve this problem, we have to enable the dedicated bandwidth occupancy time fairness feature, and it is best based on the real-time RF method. Although the products are different, the fairness of the bandwidth occupation time is very important in making 11n video sessions reach their maximum value. 8. Multicast: Some videos are transmitted using IP multicast streaming, but many WLANs are not able to handle multicast well at 802.11, so the data transmission rate should be reduced to ensure that it can be transmitted to lower-end clients. In fact, the bandwidth consumed by multicast will take longer than the time required to send N unicast frames. In order to solve this problem, we must look for some wireless multicast optimization techniques. Similarly, WLAN performance should be verified again based on video design goals, which are generally measured as Media Delivery Index (MDI). Consider the underlying principles to determine how they are applied to your WLAN. A specially designed to support mobile The WLAN of a VoIP handheld device may be very different from the wireless network designed for laptops and smartphones that use e-mail, Wi-Fi connected softphone voice and video conferencing. n20 motor,n20 gear motor,n20 micro gear motor Shenzhen Maintex Intelligent Control Co., Ltd. , https://www.maintexmotor.com