Agilent Technologies N5242A, Service Manual

Page: 94 / 342

4-20 Service Guide N5242-90001
Troubleshooting PNA Series Microwave Network Analyzers
Rear Panel Troubleshooting N5242A
C:>ping 141.121.69.162
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, or
XP 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 .
1.
The letters x represent the IP address of the analyzer.
Enter