Overview
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Keysight E6960A User Guide and Method of Implementation
27
Test Mode 2. Transmit Clock Frequency (MASTER) and MDI Output
Jitter (MASTER) Tests
Test Setup
This test may be run using either two oscilloscope channels or a single differential
probe from the transmitter (MDI). Refer to
connection details.
Specification References
[1] 1000Base-T1 IEEE Std 802.3bp-2016, Section 97.5.3.6.
[2] 1000Base-T1 IEEE Std 802.3bp-2016, Section 97.5.2.
[3] 1000Base-T1 IEEE Std 802.3bp-2016, Section 97.5.3.3.
Transmit Clock Frequency
Reference [1] specifies the symbol transmission rate of a compliant PHY. The
symbol transmission rate of the MASTER PHY shall be within the range of 750 MHz
±100 ppm.
Reference [2] specifies that in Test Mode 2 the PHY shall transmit a continuous
pattern of three {+1} symbols followed by three {-1} symbols, with the transmitted
symbols timed from its local clock source of 750 MHz. The transmitter output is a
125 MHz signal. Hence the accuracy of the transmit clock frequency is also 125
MHz ±100 ppm.
MDI Output Jitter (MASTER)
Reference [3] specifies that when in test mode 2, the RMS (Root Mean Square)
value of the MDI output jitter, relative to an unjittered reference shall be less than 5
ps.
NOTE
Use the software supplied with your transmitter PHY to control the Device Under
Test.
