CANOGA PERKINS 9161 Network Interface Device - Manual (Page 48)

9161 Ethernet Network Interface Device User’s Manual Troubleshooting
Loopback Diagnostics
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When performing loopback diagnostics, the 9161 uses a unique MAC address, designated as
the Loop Test MAC Address, which is displayed on the Loopback Setup Screen (reference Chap-
ter 3). When in loopback mode, the 9161 filters and discards all service frames.
The 9161 is configurable to swap the origination and destination MAC Addresses and to recalcu-
late 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, reference Chapter 3.
4.4.1 User Mode
User Mode loops data received on the local 10G1 Port Rx through the FPGA to the 10G1 Port
Tx. Data is not sent out the 10G2 Port Tx and incoming data on the 10G2 Port Rx is ignored (see
Figure 5-3). To set this mode, set the Loopback State for the Local Module to Local (reference
Chapter 3).
Figure 4-3. User Mode
4.4.2 Network Mode
Network Mode loops data received on the 10G2 Port Rx through the Local User side to the 10G2
Port Tx. Data is not sent out the local 10G1 Port Tx and incoming data on the local 10G1 Port Rx
is ignored (see Figure 5-4). To set this mode, set the Loopback State for the Remote module to
Remote (reference Chapter 3).
Figure 4-4. Remote-Remote Loopback Mode
Tx
Rx
Rx
Tx
10G1
PORT 10G2
PORT
LOCAL DEVICE
Tx
Rx
Rx
Tx
10G1
PORT 10G2
PORT
REMOTE DEVICE
NO DATA TRANSMISSION
DATA IGNORED
Tx
Rx
Rx
Tx
10G1
PORT 10G2
PORT
LOCAL DEVICE
Tx
Rx
Rx
Tx
10G1
PORT 10G2
PORT
REMOTE DEVICE
NO DATA TRANSMISSION
DATA IGNORED