Users Guide

NOTE: Trident2 chip sets do not work at 1G speeds with auto-negotiation enabled. As a result, when you peer any device
using SFP, the link does not come up if auto-negotiation is enabled. Therefore, you must disable auto-negotiation on
platforms that currently use Trident2 chip sets (9000 series). This limitation applies only when you convert QSFP to SFP
using the QSA. This constraint does not apply for QSFP to SFP+ conversions using the QSA.
Important Points to Remember
• Before using the QSA to convert a 40 Gigabit Ethernet port to a 10 Gigabit SFP or SFP+ port, you must enable 40 G to 4*10
fan-out mode on the device.
• When you insert a QSA into a 40 Gigabit port, you can use only the first 10 Gigabit port in the fan-out mode to plug-in SFP
or SFP+ cables. The remaining three 10 Gigabit ports are perceived to be in Link Down state and are unusable.
• You cannot use QSFP optical cables in a QSA setup.
• When you remove the QSA module alone from a 40 Gigabit port, without connecting any SFP or SFP+ cables; Dell
Networking OS does not generate any event. However, when you remove a QSA module that has SFP or SFP+ optical
cables plugged in, Dell Networking OS generates a SFP or SFP+ Removed event.
• You can use the QSA on any of the ports. However, the existing maximum fan-out restrictions apply to the ports.
• The QSA module does not have a designated EEPROM. To recognize a QSA, Dell Networking OS reads the EEPROM
corresponding to a SFP+ or SFP module that is plugged into QSA. The access location of this EEPROM is different from the
EEPROM location of the QSFP+ module.
• The diagnostics application is capable of detecting insertion or removal of both the QSA as well as the SFP+ or SFP optical
cables plugged into the QSA. In addition, the diagnostic application is also capable of reading the DDS and Vendor
information from the EEPROM corresponding to SFP+ or SFP optical cables. As a result, no separate detection of QSA is
required.
Support for LM4 Optics
The newly supported LM4 optics are similar in behavior to the LR4 optics that are already supported. However, in the output of
show inventory media command, an LM4 optical module is denoted as 40G-LM4. Barring this exception, the functionality
and behavior of LM4 optics is similar to LR4 optics.
Example Scenarios
Consider the following scenarios:
• QSFP port 0 is connected to a QSA with SFP+ optical cables plugged in.
• QSFP port 4 is connected to a QSA with SFP optical cables plugged in.
• QSFP port 8 in fanned-out mode is plugged in with QSFP optical cables.
• QSFP port 12 in 40 G mode is plugged in with QSFP optical cables.
Configuring wavelength for 10–Gigabit SFP+
optics
You can set the wavelength for tunable 10–Gigabit SFP+ optics using the wavelength command. To set the wavelength,
follow these steps:
• Enter the interface mode and set the wavelength.
INTERFACE mode
wavelength 1529.0
The wavelength range is from 1528.3 nm to 1568.77nm.
• Verify configuration changes.
INTERFACE mode
Interfaces 445