
Troubleshooting
9145E Ethernet Network Interface Device User Manual
Loopback Diagnostics
47
NID Software User Manual). When in loopback mode, the 9145E filters and discards all service
frames.
The 9145E can be configured to swap the origination and destination MAC Addresses and to
recalculate the looped frame's CRC. Test packets are returned to the source according to the
selected options. To display current loopback status, initiate loopbacks, configure address
swapping and CRC recalculation options, and to run a loopback test, see the 9145E NID
Software User Manual.
5.4.1 User Mode
User Mode loops data received on the local User Port Rx through the FPGA to the User Port Tx.
Data is not sent out the Network Port Tx and incoming data on the Network Port Rx is ignored
(see Figure 5-3). To set this mode, set the Loopback State for the Local Module to Local (see the
9145E NID Software User Manual).
Figure 5-3 User Mode
Tx
Rx
Rx
Tx
USER
PORT
NETWORK
PORT
LOCAL DEVICE
Tx
Rx
Rx
Tx
USER
PORT
NETWORK
PORT
REMOTE DEVICE
NO DATA TRANSMISSION
DATA IGNORED
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