4-20 Service Guide N5227-90001
Troubleshooting PNA Series Microwave Network Analyzers
Rear Panel Troubleshooting N5227A
Pinging 141.121.69.162 with 32 bytes of data:
Reply from 141.121.69.162: bytes=32 time<10ms TTL=127
Reply from 141.121.69.162: bytes=32 time<10ms TTL=127
Reply from 141.121.69.162: bytes=32 time<10ms TTL=127 Reply from 141.121.69.162: bytes=32
time<10ms TTL=127
Ping statistics for 141.121.69.162:
Packets: Sent = 4, Received = 4, lost = 0 <0% loss>.
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
6. The above message verifies that one way communication from the analyzer to the network has been
established
7. If the subnet mask was changed in step 2, set it back at this time.
How to Ping from the Local Area Network (LAN) to the Analyzer
Reverse communication should also be verified. Determining this, though, is dependent upon your network
setup and software. Generally, you need to issue a ping command using the IP address of the analyzer to be
tested. For example, using Windows 95, 98, 2000, XP or 7 and while at a DOS prompt, type in ping
xxx.xxx.xxx.xxx
1
. Then press ENTRY on the front panel. If full communication can be established,
then the computer display shows the cycle time for each of four cycle attempts (similar to that in step 5).
Other software may behave somewhat differently, but basically the same.
If the analyzer can talk to the network, but the network can not talk to the analyzer, then the computer or device
used from the network may have a subnet mask that excludes communication with the IP address chosen for the
analyzer. Any subnet mask other than 0.0.0.0 will exclude operation from some addresses. Changing the subnet
mask of a computer or other device should only be attempted by a qualified network administrator. Failure to
communicate due to a subnet mask incompatibility does not indicate any failure of the analyzer.
If the analyzer fails to ping in either direction, and assuming the subnet masks are set properly, then the fault
must be isolated to the analyzer or to the network. Contact a qualified network administrator.
Testing Between Two Analyzers
The ability of the analyzer's LAN to function can be easily tested by connecting two analyzers together using
a “crossover cable” (a short length of cable with an RJ-45 connector on each end).
Some network hubs have the capability to make a crossover connection using two normal, or
straight-through, cables. If this capability is not available and a crossover cable is not available, a crossover
cable can be made by following the directions in “Constructing a Crossover Cable” on page 4-21.
Set the IP addresses on two analyzers. The addresses can be set to anything, but they must be different.
Make sure the subnet mask and gateway addresses are set to 0.0.0.0 and that the LAN is active on both
analyzers. Connect the two analyzers together using either a crossover cable or a crossover hub.
Now follow the steps in “How to Ping from the Analyzer to the Local Area Network (LAN)” on page 4-19 to
have the first analyzer ping the second analyzer. When done, repeat the procedure having the second
analyzer ping the first. If both procedures function properly, the LAN circuitry on both analyzers is verified.
1. The letters x represent the IP address of the analyzer.
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