H3c-technologies H3C WX6000 Series Access Controllers Manuel d'utilisateur Page 152
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Configuring Voice Tests
Do not perform voice tests on known ports, ports from 1 to 1023. Otherwise, the NQA test might fail or
the corresponding services of these ports might be unavailable.
Voice tests of an NQA test group are used to test voice over IP (VoIP) network status, and collect VoIP
network parameters so that users can adjust the network accordingly.
A voice test takes the following procedure:
1) The source (NQA client) sends voice packets of G.711 A-law, G.711 µ-law or G.729 A-law codec
type at regular intervals to the destination (NQA server).
2) The destination affixes a time stamp to each voice packet that it receives and then sends it back to
the source.
3) Upon receiving the packet, the source calculates results, such as the delay jitter and one-way delay
based on the packet time stamps. The statistics reflect network performance.
Voice test result also includes the following parameters that reflect VoIP network performance:
z Calculated Planning Impairment Factor (ICPIF)—Measures impairment to voice quality in a VoIP
network. It is decided by packet loss and delay. A higher value represents a lower service quality.
z Mean Opinion Scores (MOS)—A MOS value can be evaluated by using the ICPIF value, in the
range 1 to 5. A higher value represents a higher quality of a VoIP network.
The evaluation of voice quality depends on users’ tolerance to voice quality, which should be taken into
consideration. For users with higher tolerance to voice quality, use the advantage-factor command to
configure the advantage factor. When the system calculates the ICPIF value, this advantage factor is
subtracted to modify ICPIF and MOS values and both the objective and subjective factors are
considered when you evaluate the voice quality.
Configuration prerequisites
Voice tests require cooperation between the NQA server and the NQA client. Before you start voice
tests, configure a UDP listening service on the NQA server. For more information about UDP listening
service configuration, see
Configuring the NQA Server.
Configuring voice tests
Follow these steps to configure voice tests:
To do… Use the command… Remarks
Enter system view
system-view
—
Enter NQA test group view
nqa
entry
admin-name
operation-tag
—
Configure the test type as voice
and enter test type view
type voice
Required
- Configuration Guide 1
- All Rights Reserved 2
- Trademarks 2
- Preface 3
- GUI conventions 4
- Symbols 4
- Network topology icons 4
- Obtaining Documentation 6
- Technical Support 6
- Documentation Feedback 6
- Table of Contents 8
- 2 Typical Network Scenarios 13
- Unified Switch Networking 14
- 3 Feature Matrixes 15
- 4 Command Matrixes 29
- Introduction 61
- Configuring Ping 61
- Tracert 64
- System Debugging 65
- 6 NTP Configuration 69
- NTP Message Format 71
- Operation Modes of NTP 72
- Symmetric peers mode 73
- Broadcast mode 73
- NTP Configuration Task List 74
- NTP Configuration Examples 83
- delay disper 89
- Root delay: 40.00 ms 89
- 7 SNMP Configuration 93
- SNMP Protocol Versions 94
- MIB Overview 94
- SNMP Configuration 95
- Configuring SNMP Logging 97
- Configuring SNMP Traps 98
- Configuring Trap Parameters 99
- Network requirements 101
- Configuration procedure 101
- 8 MIB Style Configuration 104
- 9 RMON Configuration 105
- RMON Groups 106
- Alarm group 107
- Private alarm group 107
- Configuration Procedure 109
- Configuration Prerequisites 109
- Information Center Overview 115
- System Information Format 120
- 11 NQA Configuration 136
- Basic NQA concepts 139
- NQA Configuration Task List 140
- Configuring the NQA Server 141
- Enabling the NQA Client 141
- Creating an NQA Test Group 142
- Configuring DHCP Tests 143
- Configuring DNS Tests 144
- Configuring FTP Tests 145
- Configuring HTTP Tests 146
- Configuring UDP Jitter Tests 147
- Configuration prerequisites 148
- Configuring UDP jitter tests 148
- Configuring SNMP Tests 149
- Configuring TCP Tests 150
- Configuring UDP Echo Tests 150
- Configuring UDP echo tests 151
- Configuring Voice Tests 152
- Scheduling an NQA Test Group 157
- NQA Configuration Examples 158
- 12 Index 178
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