Juniper QFX10016, Hardware Manual

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Use of third-party optical modules with high-power consumption (for example,
coherent ZR or ZR+) can potentially 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
optical modules or cables is the users’ responsibility. Juniper Networks will accept no
liability for any damage caused due to such use.
Cable Specifications for QSFP+ and QSFP28 Transceivers
The 40-Gigabit Ethernet QSFP+ and 100-Gigabit Ethernet QSFP28 transceivers that are used in QFX
Series switches use 12-ribbon multimode fiber crossover cables with socket 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 68 on page 180 describes the signals on each fiber. Table 69 on page 181 shows the pin-to-pin
connections for proper polarity.
Table 68: QSFP+ and QSFP28 Optical Module Receptacle Pinouts
Fiber Signal
1 Tx0 (Transmit)
2 Tx1 (Transmit)
3 Tx2 (Transmit)
4 Tx3 (Transmit)
180