Network Related Camera Parameters and Managing Bandwidth92 Basler pioneer7.2 Managing Bandwidth When MultipleCameras Share a Single Network PathIf you are using a single camera on a GigE network, the problem of managing bandwidth is simple.The network can easily handle the bandwidth needs of a single camera and no intervention isrequired. A more complicated situation arises if you have multiple cameras connected to a singlenetwork adapter as shown in Figure 21.Fig. 21: Multiple Cameras on a NetworkOne way to manage the situation where multiple cameras are sharing a single network path is tomake sure that only one of the cameras is acquiring and transmitting images at any given time. Thedata output from a single camera is well within the bandwidth capacity of the single path and youshould have no problem with bandwidth in this case.If you want to acquire and transmit images from several cameras simultaneously, however, youmust determine the total data output rate for all the cameras that will be operating simultaneouslyand you must make sure that this total does not exceed the bandwidth of the single path (125MByte/s).An easy way to make a quick check of the total data output from the cameras that will operatesimultaneously is to read the value of the Bandwidth Assigned parameter for each camera. Thisparameter indicates the camera’s gross data output rate in bytes per second with its currentsettings. If the sum of the bandwidth assigned values is less than 125 MByte/s, the cameras shouldbe able to operate simultaneously without problems. If it is greater, you must lower the data outputrate of one or more of the cameras.You can lower the data output rate on a camera by using the Inter-packet Delay parameter. Thisparameter adds a delay between the transmission of each packet from the camera and thus slowsthe data transmission rate of the camera. The higher the inter-packet delay parameter is set, thegreater the delay between the transmission of each packet will be and the lower the data1 PortGigEAdapterGigECameraGigECameraGigECameraGigECameraGigENetworkSwitchSingle Path
