Spirent SmartBits System, Reference Manual

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Chapter 2: System Architecture
Traffic Generation and Performance Analysis
26 SmartBits System Reference
TeraMetrics Cards and Traffic
TeraMetric Cards provide network-to-application layer performance testing and an open
architecture that allows the use of third-party test applications. The TeraMetrics platform
contains:
•
Pentium-II 500 MHz processor
•
128 MB, 100 MHz SDRAM
•
A 16 MB Flash disk memory
TeraMetrics Cards Offer Traditional, SmartMetrics, and
Terametrics Functionality.
By allowing third-party code integration, TeraMetrics facilitates easy sequencing and re-
sequencing of many varied streams and flows, at wire rates in excess of 1 terabit per
second. Refer to
Chapter 10, “Packet over SONET Modules,” for detailed information
regarding these cards.
Table Scheduler
The TeraMetrics traffic loading method is a schedule table where each entry includes the
flow number to be transmitted and the flow burstiness is controlled according to the
sequence of the entries in the table.
The table can hold up to 8,192 entries. The transmission rate is calculated as follows:
TxRate [Flow F] = (Flow F Entries in Table) * (Port TxRate)
_______________________________
Table Size
Key TeraMetrics Features
The TeraMetrics cards support the following advanced set of features:
•
System scalability that exceeds 1 terabit per second.
•
Supports port interface speeds up to 10 Gbps.
•
Supports Ethernet, ATM, and POS interfaces.
•
Measures per-port performance, IP flow performance, and QoS.
•
Supports full wire rate data plane testing, control plane testing, and application layer
testing.
•
On-board Linux/Pentium-based processing power, allowing top-to-bottom testing of
the most sophisticated network systems.