CHAPTER 8
Cable Specifications
•
Cable Specifications for QSFP+ and QSFP28 Transceivers on page 91
•
Cable Specifications for Console and Management Connections for an ACX5000
Router on page 93
•
Grounding Cable and Lug Specifications for an ACX5000 Router on page 93
•
Understanding Fiber-Optic Cable Signal Loss, Attenuation, and Dispersion in an
ACX5000 Router on page 94
•
Calculating Power Budget and Power Margin for Fiber-Optic Cables on page 95
Cable Specifications for QSFP+ and QSFP28 Transceivers
The 40-Gigabit Ethernet QSFP+ and 100-Gigabit Ethernet QSFP28 transceivers that are
used in ACX5000 routers use 12-ribbon multimode fiber crossover cables with female
MPO 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 45 on page 91 describes the signals on each fiber. Table 46 on page 92 shows the
pin to pin connections for proper polarity.
Table 45: QSFP+ MPO Cable Signals
SignalFiber
Tx0 (Transmit)1
91Copyright © 2015, Juniper Networks, Inc.
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