CHAPTER 7
Transceiver and Cable Specifications
•
Determining Interface Support for the QFX3500 Device on page 59
•
Cable Specifications for QSFP+ and QSFP28 Transceivers on page 60
•
Cable Specifications for Console and Management Connections for the QFX
Series on page 62
•
Understanding QFX Series Fiber-Optic Cable Signal Loss, Attenuation, and
Dispersion on page 63
•
Calculating the Fiber-Optic Cable Power Budget for a QFX Series Device on page 65
•
Calculating the Fiber-Optic Cable Power Margin for a QFX Series Device on page 65
Determining Interface Support for the QFX3500 Device
The 48 small form-factor pluggable plus (SFP+) access ports in the QFX3500 device
support SFP and SFP+ transceivers, as well as SFP+ direct-attach copper (DAC) cables.
The four quad small form-factor pluggable plus (QSFP+) uplink ports in the QFX3500
device support QSFP+ transceivers, as well as QSFP+ DAC and DAC breakout cables.
When the QFX3500 device is operating as a standalone switch, each QSFP+ port can
be configured to operate as 10-Gigabit Ethernetinterfaces or a single 40-Gigabit Ethernet
interface. By default, the uplink ports on a standalone switch are configured as 10-Gigabit
Ethernet interfaces.
NOTE: PortsQ1 through Q3 support four of the 10-GigabitEthernet interfaces.
Together, the three QSFP+ ports provide up to 12 10-Gigabit Ethernet
interfaces. Port Q0 also supports 10-Gigabit Ethernet interfaces, but the
number of interfaces supported depends on the release of Junos OS running
on the switch. Some Junos OS releases support three 10-Gigabit Ethernet
interfaces, others support four. See the topic on Channelizing Interface for
your specific release.
Figure 28 on page 60 shows the uplink ports and lists the interfaces created on each port
when they are configured as 10-Gigabit Ethernet interfaces.
59Copyright © 2017, Juniper Networks, Inc.
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