CANOGA PERKINS 9145 Network Interface Device - Manual (Page 82)

4-8 9145 Network Interface Device
A faulty connection can appear similar to this with one or more requests timed out:
Reply from 216.109.112.135 Seq #4 time <70 ms TTL=47
Request timed out
Request timed out
Reply from 216.109.112.135 Seq #12 time <70 ms TTL=47
Reply from 216.109.112.135 Seq #13 time <70 ms TTL=48
14 packets transmitted, 10 packets received, %28.571 packet loss
round-trip min/avg/max < 70.000/71.000/80.000 ms
Press any key to continue.
4. To terminate the PING test, press <Esc>.
Loopback Diagnostics
Use Loopbacks to diagnose a fault on the optical link. The 9145 supports four loopback
modes that you can set at the local site for both the Local and Remote 9145s. These
modes loop the data through either the physical layer (PHY) on the User side or the FPGA
when looping to the remote user link, or the FPGA when looping to the local user link.
• Local-Local Mode
Local-Local Mode loops data received on the local User Port Rx through the FPGA to
the User Port Tx. Data is not sent out the Extension Port Tx and incoming data on the
Extension Port Rx is ignored. See Figure 20. To set this mode, set the Loopback State
for the Local Module to Local.
Figure 20 - Local-Local Loopback Mode
• Local-Remote Mode
Local-Remote Mode loops data received on the Extension Port Rx through the User side
PHY to the Extension Port Tx. Data is not sent out the remote User Port Tx and
incoming data on the remote User Port Rx is ignored. See Figure 21. To set this mode,
set the Loopback State for the Local Module to Remote.
Figure 21 - Local-Remote Loopback Mode