Juniper QFX Series User Manual

management boards. Hot air exhausts from the front of the chassis, where the FRUs are
installed. See Figure 40 on page 70.
Figure 40: Port-Side-to-FRU-Side Airflow Through the QFX3500 Chassis
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FRUs
Ports
Each airflow type requires specific fan trays, management boards, and power supplies,
that have fan modules oriented in the proper direction. The fan trays and management
boards are designed so that they can only be inserted into the QFX3500 device model
that supports the same airflow type. The power supplies have labels and arrows on the
handles that depict the direction of airflow (see Figure 41 on page 70). The label AFI
denotes FRU-side-to-port-side airflow, AFO denotes port-side-to-FRU-side airflow.
CAUTION: Verify that the direction of the arrow on the power supply handle
matches the direction of airflow in the chassis. See Table 11 on page 69 to
determine your model’s airflow direction.
Figure 41: Label Identifying Airflow Direction on Power Supply Handle
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Table 12 on page 71 lists the QFX3500 device FRUs and their direction of airflow.
Copyright © 2012, Juniper Networks, Inc.70
QFX3000 Hardware Documentation

Juniper QFX Series Specifications

General

Category	Switch
Series	QFX
Form Factor	1U, 2U, and modular chassis options
Power Supply	Redundant, hot-swappable power supplies
Cooling	hot-swappable fans
Virtual Chassis	Supported on certain models
Typical Use	Data center, cloud
Operating System	Junos OS
Management	CLI
Key Features	High performance, low latency, automation
Latency	Sub-microsecond latency
Port Density	Varies by model (e.g., QFX5100: up to 48x10GbE + 6x40GbE)