JVC V25U Startup Guide - Page 22
Connection / Installation, Insufficient network bandwidth, Network Delay, Network Jitter, Packet Loss
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Connection / Installation When only MPEG4 images are distributed, the maximum number of distributions is determined by the preset bit rate. When a distribution request that exceeds the maximum number of distributions is received, this request is denied. When distributing only MPEG4 data Preset bit rate Maximum Total number of maximum bit distributions rate 0.6 Mbps 20 and below 12 Mbps 3 Mbps and 4 below 12 Mbps 6 Mbps and 2 below 12 Mbps Larger than 1 6 Mbps Maximum configurable value (8 Mbps) When both JPEG and MPEG4 images are distributed simultaneously, distribution up to two clients for JPEG and MPEG4 respectively is possible. However, distribution requests that exceed a total bit rate of 20 Mbps will be denied. Total bit rate Maximum number of distributions for JPEG Maximum number of distributions for MPEG4 20 Mbps and 2 2 below Insufficient network bandwidth When there is insufficient bandwidth, the number of JPEG frames (frame rate) that the client can acquire will decrease. Delay will also occur in the distribution of images. In the case of MPEG4, noise interference may occur and playback may fail. Network Delay When the client acquires JPEG via TCP, VN-V25U will send out data while checking the ACK from the client at the same time. For networks with considerable delay, data cannot be sent out until ACK is received, and therefore the frame rate will drop. In the case of MPEG4, noise interference may occur and playback may fail. Decrease in the frame rate due to network delays can be eliminated by receiving data via multicast. Network Jitter When there is considerable network jitter, delay time may be prolonged and the image frame rate may drop. In the case of MPEG4, noise interference may occur and playback may fail. Packet Loss When acquiring images from VN-V25U via TCP, packet loss may be recovered by TCP transmission. When there is considerable delay in the network, however, missing data may occur and the image frame rate may drop. In the case of MPEG4, noise interference may occur and playback may fail. When packet loss occurs during multicast sending from VN-V25U, the image frame rate may drop. In the case of MPEG4, noise interference may occur and playback may fail. List of Protocols and Port Numbers Used by VN-V25U VN-V25U uses the protocols and port numbers listed below. Ensure that these ports are allowed through the firewall when a firewall is to be installed. Protocol/Port No. Purpose of Use Source TCP/80 JPEG/MPEG4 acquisition, Web Settings page, API TCP/10020 TCP/10021 TCP/10023 (Reserved for adjustment) Destination TCP/20, 21 FTP TCP/25 Mail delivery TCP/110 POP (Mail Delivery) TCP/User Setting No. Sending alarm UDP/123 SNTP UDP/User Setting No. Sending alarm 22