.
Placing the jumper on the DIRECT side of the LED Monitor/Direct Connect selection header
connects the LED drive circuit to the power plane itself causing the LED to be lit when the
voltage is great enough to cause current to flow through the LED drive circuit. This LED
configuration has been designed to be used when pushing the lower limits of the acceptable
voltage range to continue to provide an indicator that power is on the plane, however without
regards to what that voltage may actually be.
The jumper on the Voltage Monitor Enable/Disable header does not matter as this is only the
input to the voltage monitor circuit which has been bypassed when the LED drive circuit is
connected directly to the power plane itself.
TLK3134 XAUI Transceiver / 4 Channel Multi-Rate Transceiver Evaluation Module (EVM) Users’ Guide
11
SLLU104A - September 2007
