QFX5200 Environmental Requirements and Specifications
General Site Guidelines
QFX5200 Grounding Cable and Lug Specifications
QFX5200 Clearance Requirements for Airflow and Hardware Maintenance
QFX5200 Chassis Physical Specifications
Site Electrical Wiring Guidelines
QFX5200 Rack Requirements
QFX5200 Cabinet Requirements

QFX5200 Site Guidelines and Requirements

QFX5200 Environmental Requirements and Specifications

The switch must be installed in a rack or cabinet. It must be housed in a dry, clean, well-ventilated, and temperature-controlled environment.

Follow these environmental guidelines:

The site must be as dust-free as possible, because dust can clog air intake vents and filters, reducing the efficiency of the switch cooling system.
Maintain ambient airflow for normal switch operation. If the airflow is blocked or restricted, or if the intake air is too warm, the switch might overheat, leading to the switch temperature monitor shutting down the device to protect the hardware components.

Table 1 provides the required environmental conditions for normal switch operation.

Table 1: QFX5200 Switch Environmental Tolerances
Description	Model	Tolerance
Altitude	QFX5200-32C and QFX5200-32C-L	No performance degradation to 6,562 feet (2000 meters)
Altitude	QFX5200-48Y	No performance degradation to 13,000 feet (3,962 meters)
Relative humidity, operating	QFX5200-32C and QFX5200-32C-L	Normal operation ensured in relative humidity range of 5% through 90%, noncondensing Short-term operation ensured in relative humidity range of 5% through 93%, noncondensing Note: As defined in NEBS GR-63-CORE, Issue 3, short-term events can be up to 96 hours in duration but not more than 15 days per year.
Relative humidity, operating	QFX5200-48Y	Normal operation ensured in relative humidity range of 5% through 93%, noncondensing for airflow out (AFO) models and 10% through 93%, noncondensing for airflow in (AFI) models
Temperature	QFX5200-32C and QFX5200-32C-L	Normal operation ensured in temperature range of 32° F through 104° F (0° C through 40° C) Nonoperating storage temperature in shipping container: –40° F through 158° F (–40° C through 70° C)
Temperature	QFX5200-48Y	Normal operation ensured in temperature range of 32° F through 113° F (0° C through 45° C) for AFO models, 32° F through 104° F (0° C through 40° C) for AFI models Nonoperating storage temperature in shipping container: –40° F through 158° F (–40° C through 70° C) for both AFO and AFI
Seismic	QFX5200 all models	Designed to comply with Zone 4 earthquake requirements per NEBS GR-63-CORE, Issue 3.

Note:

Install QFX Series devices only in restricted areas, such as dedicated equipment rooms and equipment closets, in accordance with Articles 110-16, 110-17, and 110-18 of the National Electrical Code, ANSI/NFPA 70.

General Site Guidelines

Efficient device operation requires proper site planning and maintenance. It also requires proper layout of the equipment, rack or cabinet, and wiring closet.

To plan and create an acceptable operating environment for your device and prevent environmentally caused equipment failures:

Keep the area around the chassis free from dust and conductive material, such as metal flakes.
Follow prescribed airflow guidelines to ensure that the cooling system functions properly. Ensure that exhaust from other equipment does not blow into the intake vents of the device.
Follow the prescribed electrostatic discharge (ESD) prevention procedures to prevent damaging the equipment. Static discharge can cause components to fail completely or intermittently over time.
Install the device in a secure area, so that only authorized personnel can access the device.

QFX5200 Grounding Cable and Lug Specifications

To ground a QFX5200, connect a grounding cable to earth ground and then attach it to the chassis protective earthing terminals. See Connect the QFX5200 to Earth Ground.

Warning:

To comply with GR-1089 requirements, all intra-building copper cabling used for SFP+ and QSFP+ ports must be shielded and grounded at both ends.

CAUTION:

Before switch installation begins, a licensed electrician must attach a cable lug to the grounding cables that you supply. A cable with an incorrectly attached lug can damage the switch.

Before connecting the switch to earth ground, review the following information:

The grounding lug required for a QFX5200-32C or a QFX5200-32C-L is a Panduit LCD10-10A-L or equivalent (not provided). The grounding lug should accommodates 14–10 AWG (2–5.3 mm²) stranded wire. The grounding lug required for a QFX5200-48Y is tin-plated brass 4.3 mm ring terminal that supports 18–14 AWG (0.8-2 mm²) and an M4 screw.
The grounding cable that you provide for a QFX5200 must be 14 AWG (2 mm²), minimum 90° C wire, or as permitted by the local code. If you are using the alternate method of grounding the chassis on a QFX5200-32C-DC system, the recommended grounding cable is 12 AWG (2.5 mm²) standard wire, 90° C wire or heavier.
For QFX5200-32C or a QFX5200-32C-L, ensure you have two SAE 10-32 washers and screws to attach the cable and bracket (not provided).

QFX5200 Clearance Requirements for Airflow and Hardware Maintenance

When planning the site for installing a QFX5200, you must allow sufficient clearance around the installed chassis (see Figure 1 and Figure 2).

Figure 1: Clearance Requirements for Airflow and Hardware Maintenance for a QFX5200-32C and QFX5200-32C-L

Figure 2: Clearance Requirements for Airflow and Hardware Maintenance for a QFX5200-48Y

For the cooling system to function properly, the airflow around the chassis must be unrestricted. See QFX5200 Cooling System Description for more information about the airflow through the chassis.
If you are mounting a QFX5200 in a rack or cabinet with other equipment, ensure that the exhaust from other equipment does not blow into the intake vents of the chassis.
Leave at least 24 in. (61 cm) both in front of and behind the QFX5200. For service personnel to remove and install hardware components, you must leave adequate space at the front and back of the switch. NEBS GR-63 recommends that you allow at least 30 in. (76.2 cm) in front of the rack or cabinet and 24 in. (61 cm) behind the rack or cabinet.

QFX5200 Chassis Physical Specifications

The QFX5200 is a rigid sheet-metal structure that houses the hardware components. Table 2 summarizes the physical specifications of the QFX5200.

Table 2: Physical Specifications for the QFX5200
Product SKU	Height	Width	Depth	Weight
QFX5200-32C and QFX5200-32C-L	1.72 in. (4.3 cm)	17.36 in. (44.1 cm)	20.48 in. (52 cm)	23.5 lbs (10.66 kg)
QFX5200-48Y	1.71 in. (4.34 cm)	17.25 in. (43.81 cm)	20.27 in. (51.48 cm)	30.00 lbs (13.60 kg)

Site Electrical Wiring Guidelines

Table 3 describes the factors you must consider while planning the electrical wiring at your site.

Warning:

You must provide a properly grounded and shielded environment and use electrical surge-suppression devices.

Avertissement Vous devez établir un environnement protégé et convenablement mis à la terre et utiliser des dispositifs de parasurtension.

Table 3: Site Electrical Wiring Guidelines
Site Wiring Factor	Guidelines
Signaling limitations	If your site experiences any of the following problems, consult experts in electrical surge suppression and shielding: Improperly installed wires cause radio frequency interference (RFI). Damage from lightning strikes occurs when wires exceed recommended distances or pass between buildings. Electromagnetic pulses (EMPs) caused by lightning damage unshielded conductors and electronic devices.
Radio frequency interference	To reduce or eliminate RFI from your site wiring, do the following: Use a twisted-pair cable with a good distribution of grounding conductors. If you must exceed the recommended distances, use a high-quality twisted-pair cable with one ground conductor for each data signal, when applicable.
Electromagnetic compatibility	If your site is susceptible to problems with electromagnetic compatibility (EMC), particularly from lightning or radio transmitters, seek expert advice. Strong sources of electromagnetic interference (EMI) can cause: Destruction of the signal drivers and receivers in the device, Electrical hazards as a result of power surges conducted over the lines into the equipment.

QFX5200 Rack Requirements

QFX5200 switches are designed to be installed on four-post racks.

Rack requirements consist of:

Rack type
Mounting bracket hole spacing
Rack size and strength

Table 4 provides the rack requirements and specifications for the QFX5200.

Table 4: Rack Requirements for the QFX5200
Rack Requirement	Guidelines
Rack type	Use a four-post rack that provides bracket holes or hole patterns spaced at 1 U (1.75 in. or 4.45 cm) increments and that meets the size and strength requirements to support the weight. A U is the standard rack unit defined in Cabinets, Racks, Panels, and Associated Equipment (document number EIA-310–D) published by the Electronics Industry Association.
Mounting bracket hole spacing	The holes in the mounting brackets are spaced at 1 U (1.75 in. or 4.45 cm), so that the switch can be mounted in any rack that provides holes spaced at that distance.
Rack size and strength	Ensure that the rack complies with the standards for a 19-in. or 23-in. rack as defined in Cabinets, Racks, Panels, and Associated Equipment (document number EIA-310–D) published by the Electronics Industry Association. A 600-mm rack as defined in the four-part Equipment Engineering (EE); European telecommunications standard for equipment practice (document numbers ETS 300 119-1 through 119-4) published by the European Telecommunications Standards Institute (href="http://www.etsi.org">http://www.etsi.org). The horizontal spacing between the rails in a rack that complies with this standard is usually wider than the device's mounting brackets, which measure 19 in. (48.26 cm) from outer edge to outer edge. Use approved wing devices to narrow the opening between the rails as required. Ensure that the rack rails are spaced widely enough to accommodate the switch chassis’ external dimensions. The outer edges of the front-mounting brackets extend the width to 19 in. (48.26 cm). For four-post installations, the front and rear rack rails must be spaced between 23.25 in. (59.1 cm) to 30.6 in. (77.7 cm) front-to-back. The rack must be strong enough to support the weight of the switch. Ensure that the spacing of rails and adjacent racks allows for proper clearance around the switch and rack.
Rack connection to building structure	Secure the rack to the building structure. If earthquakes are a possibility in your geographical area, secure the rack to the floor. Secure the rack to the ceiling brackets as well as wall or floor brackets for maximum stability.

QFX5200 Cabinet Requirements

You can mount the QFX5200 in an enclosure or cabinet that contains a four-post 19-in. open rack as defined in Cabinets, Racks, Panels, and Associated Equipment (document number EIA-310-D) published by the Electronics Industry Association.

Cabinet requirements consist of:

Cabinet size and clearance
Cabinet airflow requirements

Table 5 provides the cabinet requirements and specifications for the QFX5200.

Table 5: Cabinet Requirements for the QFX5200
Cabinet Requirement	Guidelines
Cabinet size and clearance	The minimum cabinet size for accommodating a QFX5200 device is 36 in. (91.4 cm) deep. Large cabinets improve airflow and reduce the chance of overheating.
Cabinet airflow requirements	When you mount the switch in a cabinet, ensure that ventilation through the cabinet is sufficient to prevent overheating. Ensure that the cool air supply you provide through the cabinet adequately dissipates the thermal output of the switch (or switches). Ensure that the cabinet allows the chassis hot exhaust air to exit the cabinet without recirculating into the switch. An open cabinet (without a top or doors) that employs hot air exhaust extraction from the top allows the best airflow through the chassis. If the cabinet contains a top or doors, perforations in these elements assist with removing the hot air exhaust. The QFX5200 fans exhaust hot air either through the vents on the port panel or through the fans and power supplies. Install the switch in the cabinet in a way that maximizes the open space on the FRU side of the chassis. This maximizes the clearance for critical airflow. Route and dress all cables to minimize the blockage of airflow to and from the chassis. Ensure that the spacing of rails and adjacent cabinets allows for the proper clearance around the switch and cabinet.

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