3Com Switch 4800G 24-Port Configuration Manual page 1049

Basic Concepts of NQA
Supporting delivery of traps
Traps can be sent to the network management server when a test is completed,
fails, or a probe fails.
A trap contains destination IP address, operation status, minimum and maximum
Round Trip Time (RTT), probes sent, and time when the last probe is performed
successfully. You can trace network running status with traps.
Test group
NQA can test multiple protocols. A test group must be created for each type of
NQA test and each test group can be related to only one type of NQA test.
Test and probe
After an NQA test is started, one test is performed at a regular interval and you
can set the interval as needed.
One NQA test involves multiple consecutive probes and you can set the number of
the probes.
In different test types, probe has different meanings:
For a TCP or DLSw test, one probe means one connection;
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For a UDP-jitter test, the number of packets sent in one probe depends on the
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probe packet-number command;
For an FTP, HTTP or DHCP test, one probe means to carry out a corresponding
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function;
For an ICMP-echo or UDP-echo test, one packet is sent in one probe;
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For an SNMP test, three packets are sent in one probe.
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NQA client and server
NQA client is the device initiating an NQA test and the NQA test group is created
on the NQA client.
NQA server processes the test packets sent from the NQA client, as shown in
Figure 308. The NQA server makes a response to the request originated by the
NQA client by listening to the specified destination address and port number.
Figure 308 Relationship between the NQA client and NQA server
NQA Client
In most NQA tests, you only need to configure the NQA client; while in TCP,
UDP-echo and UDP-jitter tests, you must configure the NQA server.
You can create multiple TCP or UDP listening services on the NQA server, with
each listening service corresponding to a specified destination address and port
number. The IP address and port number specified for a listening service on the
IP network
NQA Overview
NQA Server
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