Cable Specifications For Qsfp+ And Qsfp28 Transceivers - Juniper QFX5200 Hardware Manual

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
key up to key up , latch up to latch up , Type B , or Method B . If you are using patch
cables as
panels between two QSFP+ or QSFP28 transceivers, ensure that the proper polarity is
maintained through the cable plant.
Table 32 on page 77 describes the signals on each fiber.
connections for proper polarity.
Table 32: QSFP+ and QSFP28 Optical Module Receptacle Pinouts
Fiber
1
2
3
4
5
6
7
Table 33 on page 78
Signal
Tx0 (Transmit)
Tx1 (Transmit)
Tx2 (Transmit)
Tx3 (Transmit)
Unused
Unused
Unused
shows the pin-to-pin
77