3Com SuperStack 3 NBX Administrator's Manual page 416

416 A A: C
PPENDIX ONNE
Table 78 Pentium Processor Capabilities
Pentium II Speed (MHz)
Ports G.711
2 100
4 200
8 400
16 800
32 1600
64 3200
100 5000
X H.323 G
TIONS ATEWAY
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 78 shows the speed and bandwidth requirements for different
numbers of ports. It assumes that each packet carries a 50-byte overhead.
Pentium III Speed (MHz)
G.723 G.711
256 40
512 80
1000 160
2000 320
4000 640
10000 1280
12800 2000
The memory requirements to support port processing also increase with
each new port. A fully configured system, with the maximum number of
ports (100), needs 600 Mb of main memory. Hard disk requirements are
less than 40 Mb.
Bandwidth (Kbps) on the LAN
G.723 G.711
150 153.6
300 307.2
600 614.4
1200 1228.8
2400 2457.6
4800 4915.2
7500 7680
G.723
38.4
76.8
153.6
307.2
614.4
1228.8
1920