Spirent SmartBits System, Reference Manual

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Chapter 6: Optional Applications
SmartVoIPQoS
SmartBits System Reference 61
SmartVoIPQoS
SmartVoIPQoS allows the user to fully stress a network and analyze the network's ability
to simultaneously deliver both voice and data. Test results include IP forwarding results as
well as the expected voice quality for each flow. All results are presented in a variety of
formats that facilitate rapid user interpretation.
The following cards can be tested using the following SmartBits chassis:
•
In SMB-200/2000:
– ML-7710, 10/100 Base-TX, SmartMetrics.
– ML-771, 100 Base-FX Fiber, SmartMetrics.
•
In SMB-600 and SMB-6000B:
– LAN-3101A, 10/100 Mbps, SmartMetrics, 12-port.
– LAN-3111A, 100 Base-FX Fiber.
Refer to the SmartVoIPQoS User Guide located at http://www.netcomsystems.com/
support/documentation.asp for a complete description of the tests available. Table 6-7
gives a brief description of these tests.
Table 6-7. SmartVoIPQoS Tests and Descriptions
Test Description
Voice QoS
Measures frame loss, latency, and latency standard
deviation for data frames and frames emulating
various codes, in flows and groups of flows sent
through a device or system. It maps these metrics to
a PSQM score for voice flows and groups.
Frame Loss
Measures the number of data frames emulating
various codecs
1
that were lost from flows and groups
sent through a device.
Latency
Measures the minimum, maximum, and average
latency of received data frames and frames
emulating various codecs
1
in flows and groups of
flows sent through a device.
Latency Distribution
Measures the latency of received data frames and
frames emulating various codecs
1
in flows and
groups of flows sent through a device, and sorts them
into eight latency buckets. Compared to the Latency
test, this test can provide a finer view of latency
behavior at the DUTs load tolerance limits.