Direct Mode
The following diagram describes Direct mode on the PXIe-8521.
Figure 5. Direct Mode
PXIe-8521
User Application
PXIe Controller
XNET
OS Stack
XNET
XNET
Endpoint
Intel i210
Intel i210
XNET
Endpoint
DUT1
MAC
PHY
DUT2
MAC
PHY
Note
This diagram shows a design with two ports. Each of the device's four ports
can run independently under Direct mode.
Note
Although it is not shown in the diagram, you can simultaneously use the
XNET monitor data path on each port while it is in Direct mode. This allows you to
analyze all network traffic that is transmitted and received on the port's endpoint.
In
Direct mode
, ports are directly connected and function as endpoints; Ethernet frames
received and transmitted on the port have no relationship to any other ports on the device.
Input and output sessions are supported in Direct mode. The PXIe-8521 supports up to four
ports using Direct mode.
Tap Mode
In
Tap mode
, a pair of adjacent ports on the device, called tap partners, are connected to form a
Tap that allows the PXIe-8521 to monitor traffic. In Tap mode, physical Port 1 and Port 2 are
PXIe-8521 User Manual
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© National Instruments
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