3Com NBX 100 Administrator's Manual - page 405
Installation Requirements
405
only if it is consistent with your company’s network security policy. For
more information, see
“Firewall Security”
on
page 423
.
Windows-based
System
The ConneXtions software requires a dedicated computer system that is
running Windows NT version 4.0 with service pack 4 (or higher), or
Windows 2000. The system hardware must be certified by Microsoft. The
installation software checks for the presence of Windows 2000 or
Windows NT and then loads the correct NBX packet driver from the
NBX Resource Pack CD.
Although the ConneXtions software requires little disk storage,
processing and memory requirements are crucial, and you may need
multiple gateways. Microsoft server licenses do not apply because no
additional operating system logons are involved.
The main considerations are
“Windows Compatibility”
and
“Processor,
Memory, and Bandwidth Requirements”
, discussed next, and
“Firewall
Security”
, on
page 423
.
Windows Compatibility
To check the compatibility of your system:
1 On a computer that has Internet access, enter
www.microsoft.com/hwdq/hwtest
2 Locate the link to the Hardware Compatibility List.
3 Verify that your intended Windows 2000 or Windows NT system is on the
Hardware Compatibility List.
Processor, Memory, and Bandwidth Requirements
Each G.711 call needs about 50 MHz on a Pentium II or 20 Mhz on a
Pentium III. Each G.723 call needs about 128 MHz on a Pentium II or 75
Mhz on a Pentium III. These speed requirements increase directly with the
number of ports. The IP router bandwidth requirements also increase
directly with the number of ports.
The bandwidth requirements for a Pentium II and a Pentium III are
identical.
Table 75
shows the speed and bandwidth requirements for different
numbers of ports. It assumes that each packet carries a 50-byte overhead.