USB 3.0 Hub Design Guide
© 2015 Genesys Logic, Inc. - All rights reserved. Page 24
GLI Confidential
3.3 Channel Description – without a Cable
Figure 3.3 Channel Model without a Cable
Fig. 3.3 shows the channel topology (without a cable). The insertion loss of 8/7/8 FR4 trace is around 0.296dB
per inch (2.5G signal & PCB trace w/o via). Based on the previous case description, the max insertion loss is
20dB (including PCB trace, PCB via and connector). However, as described in the first section, the performance
is determined by channel loss, reflection, crosstalk, and the most of reflection and crosstalk are caused by
connector design. So, keeping 9 -inch and 6-inch FR4 trace length can gain much margin.
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