195. Limitations Caution!5.1. PC Environment LimitationsCheck that the ARCP-590G, ARHP-590G, and ARVP-10 operations use Windows VistaSP2 or later, Windows 7 SP1 or later, Windows 8 RTM or later, or Windows 8.1 RTM orlater. Earlier versions and other operating systems are not supported. Use the operatingsystems described above for both the host and remote stations.For KNS operations, it is necessary to set and change the open broadband router port,Windows firewall functions, and comprehensive security software. Furthermore, it is thecustomer's responsibility to handle security when using this system. If you do not haveconfidence in the settings, we recommended you stop using the system.5.2. Network Environment LimitationsDuring KNS operations via the internet, it is necessary to set the global IP address on thehost station. For your global IP address, consult your contracted provider.Only registered people can access the host station using their ID and password. Makesure that the ID and password settings cannot be guessed easily by unauthorized people.On this system, signals are exchanged via the network. Consequently, smooth operationsmay be disabled compared to normal transceiver operations as delays (duringanalog/digital conversions) and data loss (which is greatly dependent on traffic) areunavoidable. This is the principle operation of the system.Examples are cited below.Audio may break up, meter deflection may not be smooth, standby time may be delayed(in particular, it is not suitable for contests or quick operations such as pile-ups). VFOvariability may not be smooth, audio may differ from the actual transceiver audio anddigital mode communications such as image communications with SSTV and AFSK,PSK-31, etc., may be disabled, etc.Broadband is recommended for the internet line used. As a benchmark, use a minimum of1 Mbps. The speed of analog modems that use telephone lines will greatly reduce soundquality, and may destabilize control, and so cannot be used.