Teledyne LeCroy QPHY-ENET - Manual (Page 62)

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QPHY-ENET Operator’s Manual Rev G
Step 3: Slave TX_TCLK Jitter
Jitter in slave mode is designed to measure the jitter in the recovered clock in the Device Under Test relative to
the reference clock in a second 1000Base-T transmitter (also known as the Link Partner in this test). The Link
Partner is connected to the Device Under Test using a section of specially-configured CAT5 cable as described in
IEEE 802.3-2005 in clause 40.6.1.1.1.
The test channel description from the specification is reproduced in figure 52 (as follows). Four sections of cable
with different lengths and impedances build up the channel (as shown in the figure). The test channel shows a
worst-case connection between the master (Link Partner) and slave (Device Under Test).
Figure 49. Slave Jitter setup with TX_TCLK and Link Partner