Spirent SmartBits System, Reference Manual

Page: 29 / 278

Chapter 2: System Architecture
Traffic Generation and Performance Analysis
SmartBits System Reference 21
•
Round-Robin Traffic Loading . This method transmits the frame blueprints (streams)
in the sequence of the stream numbers, and repeats the sequence in a round-robin
fashion throughout the transmission.
•
Customized Frame Content . You can customize frame content with a protocol
editor, including the ability to intersperse alternate traffic with regular streams and to
add VLAN tags.
•
Tracking Frames via Triggers . You can monitor and validate packets with user-
definable triggers.
•
Trigger . A pattern tracking tool that identifies any packet with a specific pattern
located inside any of the packets received by a receiving SmartBits card. The
receiving card then counts the number of triggers received with the specific pattern.
Most Traditional applications automatically insert triggers and add user-selectable
errors depending on the application.
Enhanced Traditional Architecture.
The Enhanced Traditional cards have the ability to increment and decrement source and
destination IP addresses, as well as MAC addresses.
This feature is only available with the following cards:
•
GX-1420B, Gigabit Ethernet for the SMB-200/2000.
•
GX-1421A, Gigabit Ethernet for the SMB-200/2000.
•
LAN-3100A, 10/100 Mbps Ethernet for the SMB-600/6000B.
•
LAN-3150A, 10/100 Mbps Ethernet RMII/SMII for the SMB-600/6000B.
For more details on these cards, refer to Chapter 9, “Ethernet Cards,” .
ATM with Traditional-Plus Architecture
ATM Cards are a type of Traditional card that have a single basic frame blueprint and can
retain hundreds or thousands of PVC/SVC addresses assigned per port, depending on
ATM type.
Similar to the Traditional cards, ATM cards have additional capabilities, ranging from one
tracked trigger per port to over 2,000 triggers per port, depending on the card. For more
information, refer to
Chapter 11, “ATM Cards,” .