CANOGA PERKINS 9145E NID Software Version 3.0 - Manual (Page 52)

9145E NID Software User’s Manual Diagnostics
Loopback Setup
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4.1 Loopback Setup
The Loopback Setup screen is used to configure and initiate loopback diagnostics. Packets are
looped back at the User or Network port based on the Loop Test MAC address of the 9145E; all
packets not addressed to the Loop Test MAC Address are dropped. The 9145E can be
configured to swap origination and destination MAC addresses of the test packets and to
recalculate the CRC of the looped packet when the MAC addresses are swapped, so the
loopback packet can successfully navigate through the network back to the test originator.
At the Diagnostics menu, select Loopback Setup (1) and press Enter. The Loopback Setup
screen (Figure 4-2) opens. Type the number of the function to change, and press Enter. Cycle
through the available settings using the Space Bar. Once the setting has been selected, press
Enter to lock it. Continue to modify the settings as required. To return to the Diagnostics menu,
press Esc.
NOTE:Do not swap the source and destination and recalculate the CRC.
Figure 4-2 Loopback Setup Screen
4.2 Latency/Jitter Test
The Latency/Jitter Test screen, is used to initiate tests that measure network latency, inter-frame
jitter and frame loss from the local 9145E to a remote 9145E or other IP agent. At the Diagnostics
menu, select Latency/Jitter Test (2) and press Enter. The Latency/Jitter Test screen (Figure 4-3)
opens.
Beneath the Maximum Latency and Maximum Jitter test results are the Far End P-Bit Sent/Rcvd,
Local P-Bit Sent/Rcvd, Far End DSCP Sent/Rcvd, and Local DSCP Sent/Rcvd. This data is used
to determine if the programmed Packet Priority or DSCP was changed during the Round Trip
Canoga Perkins Corp. Ethernet Network Interface Device 29-JAN-2009
Model 9145E-101-3-0 V43.08 F211 11:20:59
------------------------------------LOOPBACK SETUP-----------------------------
Loop Test MAC Address: 00 40 2A 01 EE 11
1) Loopback State Disabled
2) Swap MAC Address
at Loopback Point? Yes
3) Recalculate CRC
at Loopback Point? Yes
Select [1-3]:
------------------------------------Messages-----------------------------------