Juniper QFX5240 - Cable Specifications for QSFP+, QSFP28, and QSFP-DD Transceivers

not provide support for third-party opcal modules and cables that are not qualied or
supplied by Juniper Networks. If you face a problem running a Juniper device that uses
third-party opcal modules or cables, JTAC may help you diagnose host-related issues if
the observed issue is not, in the opinion of JTAC, related to the use of the third-party
opcal modules or cables. Your JTAC engineer will likely request that you check the
third-party opcal module or cable and, if required, replace it with an equivalent
Juniper-qualied component.
Use of third-party opcal modules with high-power consumpon (for example,
coherent ZR or ZR+) can potenally cause thermal damage to or reduce the lifespan of
the host equipment. Any damage to the host equipment due to the use of third-party
opcal modules or cables is the users’ responsibility. Juniper Networks will accept no
liability for any damage caused due to such use.
NOTE: For interoperability with other QFX Series switches, ensure autonegoaon on the
QFX5240 is disabled.
Cable Specicaons for QSFP+, QSFP28, and QSFP-DD Transceivers
The 40-Gigabit Ethernet QSFP+, 100-Gigabit Ethernet QSFP28, and 400G (QDD-400G-DR4 and
QDD-400G-SR4P2) transceivers that are used in QFX Series switches use 12-ribbon mulmode ber
crossover cables with socket MPO-12 (UPC/APC) connectors. The ber 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 16 on page 48 describes the signals on each ber. Table 17 on page 48 shows the pin-to-pin
connecons for proper polarity.
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