Specifications

hg-09.fm
A31003-H3580-M103-2-76A9, 01-2009
HiPath 3000/5000 V8 - HG 1500 V8, Administrator Documentation
9-1
Nur für den internen Gebrauch
Technical Concepts
Environmental Requirements for VoIP
9 Technical Concepts
A number of administrable HG 1500 functions require a more comprehensive understanding of
technical details. This chapter contains sections that deal with these technical details.
9.1 Environmental Requirements for VoIP
Relevant WBM functions:
See Section 7.3.2, "LAN1 (LAN1)"
See Section 7.3.3, "LAN2 ([not used])"
See Section 7.7.4, "Media Stream Control (MSC)"
See Section 7.7.5, "HW Modules"
See Section 7.8.2, "MSC Statistics"
To ensure voice transfer quality and avoid unacceptable delays, the networks being used must
meet certain requirements.
9.1.1 Environmental Requirements in the LAN
LANs used for VoIP must meet the following specifications:
At least 256 Kbps transmission capacity per networked unit
Not more than 50 msec delay in one direction (One Way Delay) Not more than 150 msec
total delay
Not more than 1% packet loss
QoS support – IEEE 802.1p, DiffServ (RFC 2474) or ToS (RFC 791)
Every HG 1500 must be connected via a switch or a dedicated port of a router.
It is recommended that the VoIP application be connected via a separate VLAN to reduce
collisions with other transmissions. If all involved devices support VLAN (in accordance
with IEEE 802.1q), all VoIP traffic can be placed in a separate VLAN. For administration
access, LAN switches must provide individual PCs with access to multiple VLAN seg-
ments.
Not more than 20% of the available bandwidth should be used.
Not more than 10% of the total data traffic should be broadcast packets.
The error rate should not amount to more than 1% of data traffic and should not tend to
increase.