CHAPTER 9
Cable Specifications
•
Cable Specifications for QSFP+ and QSFP28 Transceivers on page 147
•
Cable Specifications for Console and Management Connections for the QFX
Series on page 149
•
Understanding QFX Series Fiber-Optic Cable Signal Loss, Attenuation, and
Dispersion on page 150
•
Calculating the Fiber-Optic Cable Power Budget for a QFX Series Device on page 151
•
Calculating the Fiber-Optic Cable Power Margin for a QFX Series Device on page 152
•
Copper Cable Specifications for QFX5100-48T Switches on page 153
Cable Specifications for QSFP+ and QSFP28 Transceivers
The 40-Gigabit Ethernet QSFP+ and 100-Gigabit Ethernet QSFP28 transceivers that are
used in QFXSeries and EX4600 switchesuse 12-ribbonmultimode fiber crossovercables
with female MPO/UPC connectors. The fiber can be either OM3 or OM4. These cables
are not sold by Juniper Networks.
CAUTION: To maintain agency approvals, use only a properly constructed,
shielded cable.
TIP: Ensure that you order cables with the correct polarity. Vendors refer to
these crossover cables as key up to key up, latch up to latch up, Type B, or
Method B. If you are using patch panels between two QSFP+ or QSFP28
transceivers, ensure that the proper polarity is maintained through the cable
plant.
Table 52 on page 147 describes the signals on each fiber. Table 53 on page 148 shows the
pin-to-pin connections for proper polarity.
Table 52: QSFP+ MPO Cable Signals
SignalFiber
Tx0 (Transmit)1
147Copyright © 2016, Juniper Networks, Inc.
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