Spirent SmartBits System, Reference Manual

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Chapter 9: Ethernet Cards
Standard Ethernet Features
126 SmartBits System Reference
These frame length techniques allow the following types of flows to be created:
•
A UDP flow and a TCP flow with packets uniformly distributed between 64 and 512
packets to simulate high probability Ethernet traffic.
•
A TCP flow of 40 bytes to simulate the TCP SYN, FIN, RST, and telnet packets with
a single keystroke. Create UDP and TCP flows at a fixed length of 1518 bytes to
simulate maximum length Ethernet packets.
•
TCP and UDP flows with multimodal distribution with narrow modes at 44 bytes, 512
bytes, and 4096 bytes to simulate background traffic centered at 40 bytes and
extending to 4096 bytes.
Packet Length
Also known as the frame length; the range of valid frame sizes in bytes.
# Ports per Card
Number of connector ports on each card.
SmartMetrics Measurements
Indicates SmartMetrics capability with advanced tracking and histograms.
Based on the SmartMetrics signature field inserted into each frame, SmartMetrics
processing can display the test results in one or more of the following display types, in
data and/or histogram formats, depending on the application and test parameters:
•
Sequence Tracking.
•
Latency over Time.
•
Latency per Stream.
•
Latency Distribution.
•
ARP Exchange Time.
•
Raw Packet Tags.
•
Frame Variation.
Note:
Additional display types are also offered for advanced applications.