CCTV Camera Pros Geovision 8.2 Multicam Digital Surveillance System - Manual (Page 370)

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TwinDVR System
TwinServer is an external application that helps sharing the networking liability from the GV-System. A
complete TwinServer concept requires at least two computers: a TwinServer, which should be run on
the computer where GV-System is installed, and a TwinDVR, which should be run on a separate
computer connected to the same LAN as the TwinServer. The TwinServer sends video stream to
TwinDVR, while TwinDVR acts as a WebCam Server and serves all WebCam clients over the Internet.
One TwinDVR can serve approximately 200 channels over the Internet. Multiple TwinDVRs can be
added to the network as online traffic increases.
There are two ways to connect TwinServer and TwinDVR: TCP/IP mode and Multicast mode. Both
have its advantages and disadvantages; choose the one that suits your application mostly.
TCP-IP Mode
TCP/IP is a simpler and cost-effective solution. In the TCP/IP mode, the TwinServer and TwinDVRs
are connected in a point-to-point connection. It means that video streams are sent from TwinServer to
TwinDVR-A, then TwinDVR-A duplicates the video streams and sends them to TwinDVR-B. If the
connection between TwinServer and TwinDVR-A is broken, TwinDVR-B will not be able to receive
video streams as well.
Figure 10-4