Specifications

6.3 SFP+ Monitor and Control
Four (4) LEDs indicate various module parameters.
• RXLOS: RX_LOS; Indicates Loss of Signal at the RX when illuminated. (LED D6 RED)
• RATE_SELECT: The LEDs do not necessarily reflect the rate select setting of the SFP+ module
because some modules can be controlled by firmware. The rate select state of the module is
controlled by the “OR” of the hardware state and the firmware state.
- RX RATE_SELECT (RS0); Indicates status of hardware setting of RX Rate Select. LED ON
indicates that the hardware configuration for RX Rate Select is set to high bandwidth
operation. (LED D6 Green) SFP or SFP+ modules that do not support RX rate select
functionality will not respond to a signal on pin 7.
- TX RATE_SELECT (RS1); Indicates status of hardware setting of TX Rate Select. LED ON
indicates that the hardware configuration for TX Rate Select is set to high bandwidth
operation. (LED D8 Green SFP or SFP+ modules that do not support TX rate select
functionality will not respond to a signal on pin 9.
• TX DIS: TX_Disable; LED ON indicates that the TX has been disabled via the hardware setting on
jumper JP2. (LED D2 RED) If the LED is ON it indicates that the module has been disabled. If the
LED is off, it does not reflect the firmware setting when Soft_TX_Disable is activated.
• TX FLT: TX_Fault; LED ON indicates a TX Fault condition exists. (LED D1 RED)
7 Typical Eye Diagrams
Figure 8 below shows a typical TX optical eye and a typical RX electrical eye. Figure 9 on page 13
shows an additional TX Optical eye taken from a JDSU 10G SFP+ module with a 1310nm VCSEL.
12
Application Note: SFP+ Evaluation Board
Figure 8:TX (top trace) and RX (bottom trace) eyes from JDSU’s 10G SFP+ module.