Specifications

hg-09.fm
A31003-H3580-M103-2-76A9, 01-2009
HiPath 3000/5000 V8 - HG 1500 V8, Administrator Documentation
9-9
Nur für den internen Gebrauch
Technical Concepts
Quality of Service (QoS)
Bandwidth calculation for the DES/3DES encryption algorithm:
9.3 Quality of Service (QoS)
Relevant WBM functions:
See Section 7.3.2, "LAN1 (LAN1)"
See Section 7.3.3, "LAN2 ([not used])"
See Section 7.4.4.6, "PSTN peers"
See Section 7.1.7, "Quality of Service"
See Section 7.7.2, "QoS Data Collection"
Quality of Service encompasses various methods for guaranteeing certain transmission prop-
erties in packet-oriented networks (IP).
It is thus important, for example, to ensure a minimum bandwidth for Voice over IP for the entire
duration of the transfer operation. If multiple applications with equal rights are operating via IP,
then the available bandwidth for the transmission path (e. g. an ISDN B channel, 64 Kbps) is
split. In this case, a voice connection may experience packet losses which can reduce voice
quality.
Codec Packet-
ing
Sample
size
(msec)
Pay-
load
(bytes)
Padding
(bytes)
Ethernet
packet
length
Payload
packet
(overhead
in %)
Ethernet
load incl.
preamble
(Kbps)
G.711 20 20 160 6 286 75% 114.4
G.711 30 30 240 6 366 50% 97.6
G.711 40 40 320 6 446 38% 89.2
G.711 60 60 480 6 606 25% 80.8
G.723.1 1 30 24 6150500% 40.0
G.723.1 2 60 48 6 174 250% 23.2
G.723.1 3 90 72 6 198 167% 17.6
G.729A 1 20 20 2 142 600% 56.8
G.729A 2 40 40 6166300% 33.2
G.729A 3 60 60 2182200% 24.3
Table 9-12 LAN Bandwidth Requirement with DES/3DES Encryption – By Codec
>
Bold typeface is used to highlight values that are not identical in both tables.