Qos Settings - NEC UNIVERGE SV9100 Manual

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2.2

QoS Settings

SV9100 QoS
When transmitting Voice over an IP network it is important to consider Quality of Service (QoS). This is the
perceived quality of speech after being transmitted across the network.
It is recommended that you consult the "Voice over IP Reference Guide" as this discusses the issues that
should be considered when implementing a VoIP network.
QoS is actually implemented on the network hardware such as switches and routers, and not the SV9100.
The SV9100 can "mark" its data with appropriate tags and the network equipment has to be configured to
prioritise that data over other (non VoIP) data. The Network Administrator should supply the SV9100
installer with the relevant QoS settings for their Network.
QoS can either be implemented at Layer 2 (within the Ethernet Frame Header) for Local Area Network
(LAN) QoS policies or at Layer 3 (within the IP Packet Header) for Wide Area Network (WAN) point-to-point
QoS policies.
Easy Edit – Advanced Items/VoIP/QoS Settings/Layer 2 QoS and VLAN. (PRG84-09)
QoS is implemented at Layer 2 by using VLAN (IEEE 802.1p/Q) tags.
Choose which interface needs to be programmed:
Interface 1 = GCD-CP10 Ethernet connection
Interface 2 = GPZ-IPLE VoIP connection
For any VoIP applications Interface 2 is used.
VLAN Mode - By default the system does not use VLAN tags, so these have to be enabled. Once enabled,
all frames transmitted by the GCD-CP10 and GPZ-IPLE cards use the VLAN tags.
VLAN ID - This is the VLAN that the system belongs to. Valid values can be in the range 0 to 4094.
Priority - The priority should be configured between 0 (no prioritisation) to 7 (highest priority). Voice
applications normally use a priority value of 5.
Easy Edit – Advanced Items/VoIP/QoS Settings/Layer 3 QoS. (PRG84-10)
This is the most common form of QoS. It utilises the Type of Service (ToS) field within the IP packets
header, and can be configured based on two different QoS standards: IP Precedence and Differentiated
Services (Diffserv).
Although IP Precedence and Diffserv are both supported on the UNIVERGE SV9100, it is becoming more
common to use Diffserv only. The two methods of QoS are interoperable (for example IP precedence
values can be mapped to Diffserv values and vice versa).
The ToS value can be set for each type of VoIP packet.
ToS Mode – Choose Disabled (Default), IP Precedence or Diffserv depending on the networks configured
QoS policy.
IP Precedence Priority – Only use if the ToS Mode is set to IP Precedence. Enter the required IP
Precedence value between 0 and 7.
IP Precedence Delay – Normally this value is not required. Use only IP Precedence Priority (above).
IP Precedence Throughput – Normally this value is not required. Use only IP Precedence Priority (above).
IP Precedence Reliability – Normally this value is not required. Use only IP Precedence Priority (above).
IP Precedence Cost – Normally this value is not required. Use only IP Precedence Priority (above).