CANOGA PERKINS 9145 Network Interface Device - Manual (Page 83)

9145 Network Interface Device 4-9
• Remote-Local Mode
Remote-Local Mode loops data received on the User Port Rx through the FPGA to the
User Port Tx. Data is not sent out the remote Extension Port Tx and incoming data on
the remote Extension Port Rx is ignored. See Figure 22. To set this mode, set the
Loopback State for the Remote module to Local.
Figure 22 - Remote-Local Loopback Mode
• Remote-Remote Mode
Remote-Remote Mode loops data received on the Extension Port Rx through the Local
User PHY to the Extension Port Tx. Data is not sent out the local User Port Tx and
incoming data on the local User Port Rx is ignored. See Figure 23. To set this mode,
set the Loopback State for the Remote module to Remote.
Figure 23 - Remote-Remote Loopback Mode
For loopbacks, the 9145 uses a unique MAC address, the Loop Test MAC Address, which is
displayed on the Loopback Setup Screen. For details about using the software and
accessing the Loopback Setup Screen, see Chapter 4. When in loopback mode, the 9145
filters the incoming packets to identify test packets identified by the MAC address.
The 9145 is configurable 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.
Use the Loopback Setup Menu to display current loopback status, initiate loopbacks, and
configure Address Swapping and CRC Recalculation options. To run a loopback test, follow
these steps: