Specifications

4.1.2 Power Supply
SFP+ devices are hot-pluggable and can be installed when the power is active. Set the power supply to
achieve 3.3 VDC at the Transceiver. Verify that the transmitter is seeing 3.3 volts by checking the TX
and RX voltage at the sense pins (VTS+/VTS- and VRS+/VRS- respectively) on the power supply
connector (see Figure 2 below).
Note: Set the Current Limit to ~300 milliamps per evaluation board if using a common power supply.
This should supply enough current for the TX, RX, and the Evaluation board over temperature.
• Maximum TX current is 110 mA
• Maximum RX current is 120 mA
4.1.3 Power Connections
The SFP+ Transceiver module requires separate power supplies for the TX and RX in accordance with
the SFP+ MSA. TX power and RX power are applied at their respective 4-pin connectors. The
Evaluation board is shipped with two 0 Ω resistors installed across the jumpers that allow the 2 power
supplies to be connected together. If the user wants to power the TX and RX from individual power
supplies then the 0 Ω resistors need to be removed. After the 0 Ω resistors are removed, either
jumper JP1 or JP2 can be used to run both TX and RX from a single power supply.
5 Description of Connectors and Jumpers
Figure 2 below shows the location of the connectors and jumpers on the JDSU SFP+ Evaluation board.
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Application Note: SFP+ Evaluation Board
Figure 2: Connectors and Jumpers on JDSU’s 10G SFP+ Evaluation Board.