Juniper QFX5120 Series Hardware Guide

Table 29: QSFP+ and QSFP28 MPO Cable Signals (continued)
SignalFiber
Rx1 (Receive)11
Rx0 (Receive)12
Table 30 on page 78 shows the pin-to-pin connections for proper polarity
Table 30: QSFP+ and QSFP28 MPO Fiber-Optic Crossover Cable Pinouts
PinPin
121
112
103
94
85
76
67
58
49
310
211
112
Calculating the Fiber-Optic Cable Power Budget for QFX Series Switches
Calculate the fiber-optic data link's power budget when planning fiber-optic cable layout and distances to
ensure that fiber-optic connections have sufficient power for correct operation. The power budget is the
maximum amount of power the link can transmit. When you calculate the power budget, you use a
78

Juniper QFX5120 Series Specifications

General

Rack Units	1 U
Junos OS	Yes
Form Factor	Fixed
Power Supply	Dual, hot-swappable
Cooling	Front-to-back or back-to-front airflow
Fans	Hot-swappable
Operating Temperature	32°F to 104°F (0°C to 40°C)
Storage Temperature	-40°F to 158°F (-40°C to 70°C)
Humidity	5% to 90% non-condensing
AC Power Input	100 to 240 VAC
Management Ports	1x RJ-45 console, 1x USB, 1x RJ-45 management