Teledyne LeCroy QPHY-ENET - Manual (Page 39)

QPHY-ENET Software Option
QPHY-ENET Operator’s Manual Rev G
39
100Base-TX compliance test patterns
100Base-TX testing requires special patterns that need to be generated from DUT port. DUT makers supply the
software to generate these testing patterns.
Figure 28. Fixture setup for 100Base-TX mask test
1. Connect the Device Under Test to the RJ45 jack J64 on the section G of TF-ENET-B using the short
cable supplied in the fixture kit.
2. Connect SMA cables to the oscilloscope for the pair you want to test using section G of the TF-ENET-B
test fixture. Refer to
X
Table 3.
X
.
Pair Pair Pair Pair CH2 CH2 CH2 CH2 CH3 CH3 CH3 CH3
A J51 J30
B J52 J31
C J32 J53
D J54 J33
Table 3. Pair and Jumpers configurations
3. Using the Vertical menu of the oscilloscope, set the coupling to “DC50Ω” and the offset to 0 V.
4. Set the Device Under Test to transmit a 100Base-TX Halt Line State (Jitter 9.1.9) signal.
Note: The test pattern needed depends on the test performed. Also, how to make a device generate the pattern is implementation specific.
Please consult your Ethernet PHY device manufacturer for information on setting the device to transmit the specific test patterns The ENET
software will also perform measurements on any arbitrary data pattern from the Device Under Test. Specific patterns are called out in this
procedure where they are required by the standard.
5. Adjust the level of the signal on channel 2 until it completely fills the grid on the oscilloscope screen
(about 7.5 divisions). Select “Variable Gain” in the Volts/Div control in the vertical menu. This provides
the maximum dynamic range to the measurement.
6. Set the vertical scale on channel 3 to the same value as that in channel 2 after the signal in channel 2 has