1-14
IM AQ1300-01EN
Test Tags
When you are using two AQ1300/AQ1301 in a two-way or loopback test configuration, you can
attach test tags for analysis to the Tx frames.
Test tags are inserted immediately before the Tx frame FCS.
Test tags can be inserted when the test mode is Traffic Test or QoS Test.
When Auto or Auto(Remote) has been selected in the Test menu, test tags are always inserted.
When Manual has been selected in the Test menu, you can select whether or not to insert test tags.
Preamble
Test tags
FCS
Data
16 bytes
4 bytes
8 bytes
Arbitrary
Inserted Data
The following data is inserted into test tags.
Data Type
Description
Test ID
The IDs of the AQ1300/AQ1301 and the test item
Additional test data
For status notification and exchanging test setup information
Frame ID
The frame (QoS channel) number
Timestamp
Latency measurement data is inserted here.
Sequence number
A sequence number is inserted here.
Payload check CRC
A CRC for the payload
Tag identifier
A fixed identifier that indicates that the data is a tag.
Tag length
Tag field length in units of 2 bytes (for expansion)
Timestamp
The timestamp (time data) is inserted into a (32-bit) field in the test tag. If the other device is in
Loopback Test mode, you can use the timestamp to measure the latency.
Sequence Number
By inserting a sequence number into a (32-bit) field in a test tag and then sending the frame, the
AQ1300/AQ1301 can check for sequence errors between itself and the other device.
When the test mode is Traffic Test, the same sequence number is inserted for all ports. When the
test mode is QoS test, sequence numbers are inserted separately for each channel.
Payload Check CRC
By computing a (16-bit) CRC of the Tx frame payload, inserting the result into a test tag field, and
then sending the frame, the AQ1300/AQ1301 can check for payload errors between itself and the
other device.
PN Pattern
By inserting a pseudo-random pattern (PN15) into the fill pattern data area of a Tx frame payload
and then sending the Tx frame to the other device, the AQ1300/AQ1301 can perform a BER
measurement to check for device errors.
Error Addition
The AQ1300/AQ1301 can add the following errors to the frames that it sends.
CRC errors, symbol errors, sequence errors, payload errors, bit errors, undersize errors,
*
oversize
errors
*
* Set the Tx frame length.
1.6 Transmission Features
