Teledyne-lecroy QPHY-ENET Manuel d'utilisateur télécharger pdf (Page 39)

QPHY-ENET Software Option

QPHY-ENET Operator’s Manual Rev G

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

Table 3.

Pair

PairPair

Pair

CH2

CH2CH2

CH2

CH3

CH3CH3

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

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Teledyne-lecroy QPHY-ENET Manuel d'utilisateur Page 39