Specifications

3000sb4.fm
P31003-H3560-X100-1-7618, 09/05
HiPath 3000/5000 V6.0, System Description
4-5
For internal use only
HiPath 3000/5000 in the LAN Network
Network Analysis
A "compressed header" is usually used for RTP/UDP/IP Header compression. In addition every
5 seconds a full header is sent (total = 46 octets).
The rule of thumb for calculating the bandwidth requirement for n parallel VoIP connections with
G.711 (one frame per RTP packet) is:
Bandwidth LAN = n × (180 voice payload + 0.4 RTPC)
Bandwidth WAN = n × (82 voice payload + 0.4 RTPC)
The approximate values for voice payload changes for other codecs or packet values. In addi-
tion, the bandwidth for Attendant P, call charge information, and other applications must also
be taken into account.
Bandwidth requirement for CAR-Alive/Node Survey
There are two different methods for performing CAR-Alive/node survey: either a TCP-based
mechanism or an ICMP ping (configurable with Manage I or WBM).
IP header 20
PPP 9
Total 46
Compressed header 8
Node
Number
TCP load
(Kbps)
Ping load
(Kbps)
Time-
out
10.10.112
20.20.3
30.50.8
41.01.7
51.72.8
62.54.2
Table 4-6 LAN Bandwidth Requirement for CAR-Alive/Node Survey
Node
Number
TCP load
(Kbps)
Ping load
(Kbps)
1 0.07 0.11
Table 4-7 WAN Bandwidth Requirement for CAR-Alive/Node Survey
Protocol Bytes
Table 4-5 Overhead Calculation