By default, the 40-Gigabit uplink ports operate at 40 Gbps, but you can use the
speed-group 10000
command
to change the administrative speed to 10 Gbps. If you change the speed, you must also use a QSFP-to-SFP
adapter and a supported SFP+ transceiver in each of the converted SFP+ ports. All of the ports in a group of
ports must operate at the same speed or you will see an error with a "check speed-group config" message.
The 12-port uplink module has two port groups (ports 1 through 6 [2/1-6], and ports 7 through 12 [2/7-12],
the six-port uplink module has six active ports (ports 1 through 6), and the four-port uplink module has four
active ports (ports 1 through 4).To return the administrative speed to 40 Gigabits, use the
no speed-group
10000
command.
The M12PQ uplink module ports connected with copper cables do not autonegotiate their speeds so you
must set the speed for each port at the connected device by using the
speed 40000
command.
Note
Statement 1051
—
Laser Radiation
Invisible laser radiation may be emitted from disconnected fibers or connectors. Do not stare into beams
or view directly with optical instruments.
Warning
Downlink Connections
The Cisco Nexus 9396PX switch has 48 downlink ports that connect to servers or Fabric Extenders (FEXs).
Each of these ports supports 1-Gigabit and 10-Gigabit speeds over optical cables.
For a listing of the transceivers and cables that the optical downlink ports support, see
c/en/us/support/interfaces-modules/transceiver-modules/products-device-support-tables-list.html
Guidelines for Connecting Ports
You can use Quad Small Form-Factor Pluggable Plus (QSFP+) transceivers for uplink connections to other
network devices, and you can use SFP or SFP+ transceivers for downlink connections to other network devices.
For information about the transceivers currently being used with the switch, use the
show inventory all
command.
To prevent damage to the fiber-optic cables that can separate from their cables, we recommend that you keep
the transceivers disconnected from their fiber-optic cables when installing the transceiver in the line card.
Before removing such a transceiver from the switch, remove the cable from the transceiver.
To maximize the effectiveness and life of your transceivers and optical cables, do the following:
•
Wear an ESD-preventative wrist strap that is connected to an earth ground whenever handling transceivers.
The switch is typically grounded during installation and provides an ESD port to which you can connect
your wrist strap.
•
Do not remove and insert a transceiver more often than is necessary. Repeated removals and insertions
can shorten its useful life.
•
Keep the transceivers and fiber-optic cables clean and dust free to maintain high signal accuracy and to
prevent damage to the connectors. Attenuation (loss of light) is increased by contamination and should
be kept below 0.35 dB.
Cisco Nexus 9396PX NX-OS Mode Switch Hardware Installation Guide
32
Connecting the Switch to the Network
Downlink Connections
