HP 6125G HP 6125G & 6125G/XG Blade Switches Network Management and Mon - Page 117

Configuration prerequisites, Configuring the NQA server

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IMPORTANT: 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. A voice test performs 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: • 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. • Mean Opinion Scores (MOS)-A MOS value can be evaluated by using the ICPIF value, in the range of 1 to 5. A higher value represents a higher quality of a VoIP network. The evaluation of voice quality depends on users' tolerance for voice quality, which should be taken into consideration. For users with higher tolerance for 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, so objective and subjective factors are both considered when you evaluate 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." • Only one probe operation is performed in one voice test. Configuration procedure To configure voice tests: Step 1. Enter system view. 2. Enter NQA test group view. 3. Configure the test type as voice, and enter test type view. Command system-view nqa entry admin-name operation-tag type voice 4. Configure the destination address of voice probe packets. destination ip ip-address Remarks N/A N/A N/A By default, no destination IP address is configured for a test operation. The destination IP address must be the same as that of the listening service on the NQA server. 110

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110
IMPORTANT:
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.
A voice test performs 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:
•
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.
•
Mean Opinion Scores (MOS)
—A MOS value can be evaluated by using the ICPIF value, in the
range of 1 to 5. A higher value represents a higher quality of a VoIP network.
The evaluation of voice quality depends on users' tolerance for voice quality, which should be taken into
consideration. For users with higher tolerance for 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, so objective and subjective factors are both considered
when you evaluate 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
."
•
Only one probe operation is performed in one voice test.
Configuration procedure
To configure voice tests:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter NQA test group
view.
nqa
entry
admin-name
operation-tag
N/A
3.
Configure the test type as
voice, and enter test type
view.
type voice
N/A
4.
Configure the destination
address of voice probe
packets.
destination ip
ip-address
By default, no destination IP address is
configured for a test operation.
The destination IP address must be the same
as that of the listening service on the NQA
server.