Chapter 9: Ethernet Cards
Standard Ethernet Features
SmartBits System Reference 127
Sequence Tracking
Sequence tracking is on a per-stream basis. Received data is monitored and a record is
kept of the following:
• Transmitting port number.
• Transmitting stream number.
• Total number of frames received.
• Number of frames received in sequence.
• Number of duplicate frames received.
• Number of frames expected, but not received.
Latency Over Time
In this test, the user selects a time interval such as every 10 ms. For each stream, every 10
ms histogram statistics are kept on:
• Total number of packets received.
• Minimum latency within this time period.
• Maximum latency within this time period.
• Average latency within this time period.
Latency per Stream
Same as Latency over Time except the data is displayed for each incoming stream.
Latency Distribution
The user selects up to 16 time intervals. The following information is displayed within
each time interval and for each stream:
• Transmitting port number.
• Stream number.
• Total number of frames received.
• Number of frames received within each interval.
ARP Exchange Times
This is a test of ARP response. For each stream that uses IP or UDP, an ARP request is
transmitted. The timestamp of the request and its response is stored for each active stream.
Raw Packet Tags
No filtering is performed on stream tags received. Up to 130,000 packets are stored and
sent to the application. The user can take the data in the delta column, paste it into a
spreadsheet, and determine standard deviation and latency variation.
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