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his establishes one way communication from the analyzer to the network. Reverse
communication should also be veri ed. Determining this, though, is dependent upon your
network setup and software. Generally you will need to issue a ping command using the IP
address of the analyzer to be tested. For example, using Windows 95 and while at a DOS
prompt, type in
ping xxx.xxx.xxx.xxx
address of the analyzer). If full communication can be established, then the computer display
will show the cycle time for each of four cycle attempts (similar to that in step 7). Other
software may behave slightly di erently, but all should function basically the same.
If the analyzer will talk to the network, but the network will 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
will exclude operation from some addresses. Changing the subnet mask of a computer
0.0.0.0
or other device should only be attempted by a quali ed 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 okay, then
the fault must be isolated to the analyzer or to the network. Contact a quali ed network
administrator or refer to the
information. You may also substitute a known working analyzer to help isolate the fault.
Testing Between Two Analyzers
he ability of the analyzer's LAN to function can be easily tested by connecting two analyzers
together using a short length of cable with two RJ-45 connectors on each end. However,
a \crossover" cable must be used in order for this to work. Some network hubs have the
capability to make a crossover connection using two normal, or straight-through, cables. If this
is available, use it; otherwise a crossover cable can be made as follows:
A crossover cable can be made from a normal LAN cable by connecting pin 1 from each
connector to pin 3 of the other connector. Likewise pin 2 should be connected to pin 6.
1. Strip away a few inches of the outside jacket insulation from the middle of a standard
LAN cable that has an RJ-45 connector on each end.
2. Most, but not all, LAN cables use the following color coding:
Pin
Color
1 (transmit +) White/orange
0
2 (transmit
) Orange
3 (receive +)
White/green
4
Blue
5
White/blue
0
6 (receive
)
Green
7
White/brown
8
Brown
If your cable does not use this scheme, you will have to determine each conductor color
with a continuity tester.
, then press
Option 1F7 ser's Guide Supplement
Constructing a Cross-over Cable
(the letters x represents the IP
ENTER
5
for more troubleshooting
T roubleshoot ng and Block D agrams
4-31
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