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I have a USB 2.0 low-speed connection design with an unusual constraint. On the host side the D+ and D- lines have a branch, a requirement of the connector and this cannot be changed. On the device side, there is the option of either using just one side of each branch (and creating an unterminated stub on the host side) or connecting both (and forming a loop). This option is indicated by the dashed line. Connector options

Which option is better in terms of signal integrity, and how can it be improved. For example, if only the solid line on the device side was used would some kind of termination of the other host branch be helpful?

Thanks for any responses!

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  • \$\begingroup\$ How far are these branch pins apart on the connector? Can you always guarantee that the host side has both branches connected? \$\endgroup\$ – Ron Beyer Feb 4 at 19:02
  • \$\begingroup\$ On the connector the branched pins are ~10mm apart. On the host side both branches are always connected to each other. \$\endgroup\$ – Jetkov Feb 5 at 19:18

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