Intel 1000BASE-T

1000BASE-T/100BASE-TX/10BASE-T Physical Layer Compliance Tests Manual
Intel Confidential 39
100Base-TX Signal Amplitude Symmetry
10 100Base-TX Signal Amplitude
Symmetry
ANSI Section 9.1.4
10.1 Test Purpose
To measure the voltage symmetry of the positive and negative waveforms.
10.2 Specification
“The ratio of the +V
OUT
magnitude to -V
OUT
magnitude shall be between the limits:
.”
1
10.3 Test Procedure
1. Perform test described in Section 9 if it has not already been done.
2. Calculate the ratio of +V
OUT
to -V
OUT
using the values from the results of Section 9.
3. Record the results.
4. Verify the measurements meet specifications.
Figure 10-1. Calculating the Ratio of +V
OUT
to -V
OUT
1. ANSI X3.263-1995, p 29.
0.98
V
OUT
V–
OUT
--------------------
1.02≤≤
From the plots in Section 8:
0.98 ≤ 1.003 ≤ 1.02.
Note: +V
OUT
and -V
OUT
have the same units (V).
1.014V
1.011V
----------------- 1 . 0 0 3=