Installation Requirements 405only if it is consistent with your company’s network security policy. Formore information, see “Firewall Security” on page 423.Windows-basedSystemThe ConneXtions software requires a dedicated computer system that isrunning Windows NT version 4.0 with service pack 4 (or higher), orWindows 2000. The system hardware must be certified by Microsoft. Theinstallation software checks for the presence of Windows 2000 orWindows NT and then loads the correct NBX packet driver from theNBX Resource Pack CD.Although the ConneXtions software requires little disk storage,processing and memory requirements are crucial, and you may needmultiple gateways. Microsoft server licenses do not apply because noadditional operating system logons are involved.The main considerations are “Windows Compatibility” and “Processor,Memory, and Bandwidth Requirements”, discussed next, and “FirewallSecurity”, on page 423.Windows CompatibilityTo check the compatibility of your system:1 On a computer that has Internet access, enterwww.microsoft.com/hwdq/hwtest2 Locate the link to the Hardware Compatibility List.3 Verify that your intended Windows 2000 or Windows NT system is on theHardware Compatibility List.Processor, Memory, and Bandwidth RequirementsEach G.711 call needs about 50 MHz on a Pentium II or 20 Mhz on aPentium III. Each G.723 call needs about 128 MHz on a Pentium II or 75Mhz on a Pentium III. These speed requirements increase directly with thenumber of ports. The IP router bandwidth requirements also increasedirectly with the number of ports.The bandwidth requirements for a Pentium II and a Pentium III areidentical.Table 75 shows the speed and bandwidth requirements for differentnumbers of ports. It assumes that each packet carries a 50-byte overhead.
