Site Guidelines and Requirements for SRX4700

The proper function of the SRX4700 depends on your meeting certain environmental requirements, following site and wiring guidelines, and ensuring that your installation meets the grounding specifications and airflow clearance requirements that support SRX4700 .

Site Preparation Checklist for SRX4700

The checklist in Table 1 summarizes the tasks you need to perform when preparing a site for SRX4700 installation.

Table 1: Site Preparation Checklist
Item or Task	For More Information	Performed by	Date
Environment
Verify that environmental factors such as temperature and humidity do not exceed router tolerances.	Environmental Requirements and Specifications for SRX4700
Power
Measure the distance between the external power sources and the router installation site.	Clearance Requirements for Airflow and Hardware Maintenance for SRX4700
Locate sites to connect system grounding.
Rack or Cabinet
Verify that the rack or cabinet meets the minimum requirements for installing the router.	Rack Requirements Cabinet Requirements
Plan rack or cabinet location, including required space clearances.
Secure the rack or cabinet to the floor and building structure.
Cables
Acquire the cables and connectors: Determine the number of cables needed based on your planned configuration. Review the maximum distance allowed for each cable. Choose the length of the cable based on the distance between the hardware components being connected.
Plan the cable routing and management.

Environmental Requirements and Specifications for SRX4700

You must install the router in a rack or cabinet. You must house the router in a dry, clean, well-ventilated, and temperature-controlled environment.

Follow these environmental guidelines:

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

Table 2 provides the required environmental conditions for normal router operation.

Table 2: SRX4700 Environmental Tolerances
Altitude	Relative Humidity	Temperature	Seismic
6000 ft	Normal operation ensured in the relative humidity range of 5% through 85%, noncondensing.	Normal operation ensured in the 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).	Designed to comply with Zone 4 earthquake requirements per DC NEBS GR-3160.

Note:

Install the firewall 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. You also need to ensure maintenance and 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 the prescribed airflow guidelines to ensure that the cooling system functions properly. Ensure that the 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.

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: Radio frequency interference (RFI) because of improperly installed wires Damage from lightning strikes occuring when wires exceed recommended distances or pass between buildings Electromagnetic pulses (EMPs) caused by lightning damaging 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. To 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.

Rack Requirements for SRX4700

You can mount the SRX4700 on four-post racks. The rack mounting kit (JNP-4P-TL-1RU-RMK) is shipped with the firewall. Table 4 provides the rack requirements and specifications for SRX4700.

Table 4: Rack Requirements and Specifications
Rack Requirement	Guidelines
Rack type	Use a four-post rack with bracket holes or hole patterns spaced at 1 U increments (1.75 in. or 4.45 cm). Ensure that the rack meets the size and strength requirements to support the weight. A U is the standard rack unit as defined in Cabinets, Racks, Panels, and Associated Equipment (document number EIA-310–D) published by the Electronics Industry Association.
Mounting bracket hole spacing	Ensure that the holes in the mounting brackets are spaced at 1U (1.75 in. or 4.45 cm) increments so that the device can be mounted in any rack that provides holes that are spaced at that distance. The front rack opening between the flanges must be 450 mm wide + 2 mm (17.75 in. + 0.08 in.).
Rack size and strength	Ensure that the rack complies with the standards for a 19 in. rack as defined in Cabinets, Racks, Panels, and Associated Equipment (document number EIA-310–D) published by the Electronics Industry Association. Use an 800 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 (http://www.etsi.org). The horizontal spacing between the rails in a rack compliant with this standard is usually wider than the device's mounting brackets. The mounting brackets 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 external dimensions of the device chassis. The outer edges of the front-mounting brackets extend the width to 19 in. (48.26 cm). Ensure that for four-post installations, the front and rear rack rails are spaced between 23.6 in. (60 cm) and 36 in. (91.4 cm) front-to-back. Ensure that the rack is strong enough to support the weight of the device. A fully-configured SRX4700 with 2 PSUs weighs about 42 lb (19.1 kg). Ensure that the spacing of rails and adjacent racks allows for proper clearance around the device and rack.
Rack connection to building structure	Secure the rack to the building structure. If earthquakes occur in your geographical area, secure the rack to the floor. Secure the rack to the ceiling brackets and to wall or floor brackets for maximum stability.

Cabinet Requirements

You can mount the device in a cabinet that contains a 19-in. rack.

Cabinet Requirement	Guidelines
Cabinet size and clearance	The minimum cabinet size is 27.7 in. (70.35 cm) between cabinet front door and cabinet rear wall. It is recommended to have minimum of 6 in. clearance from the cabinet front door and switch front panel minimum of 6 in. clearance from the cabinet rear wall and switch rear panel. Large cabinets improve airflow and reduce chances of overheating. The outer edges of the front mounting brackets extend the width of the chassis to 19 in. (48.2 cm).
Cabinet airflow requirements	When you mount the device in a cabinet: Ensure that ventilation through the cabinet is sufficient to prevent overheating. Ensure that there is adequate cool air supply to dissipate the thermal output of the device or devices. Ensure that the hot air exhaust of the chassis exits the cabinet without recirculating into the device. An open cabinet (without a top or doors) that employs hot air exhaust extraction from the top ensures 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. Install the device in the cabinet in a way that maximizes the open space on the side of the chassis that has the hot air exhaust. Route and secure all cables to minimize the blockage of airflow to and from the chassis. Ensure that the spacing of rails and adjacent cabinets is such that proper clearance exists around the device and cabinet. A cabinet larger than the minimum required provides better airflow and reduces the chance of overheating.

Cabinet Requirement

Guidelines

Cabinet size and clearance

The minimum cabinet size is 27.7 in. (70.35 cm) between cabinet front door and cabinet rear wall. It is recommended to have minimum of 6 in. clearance from the cabinet front door and switch front panel minimum of 6 in. clearance from the cabinet rear wall and switch rear panel. Large cabinets improve airflow and reduce chances of overheating.
The outer edges of the front mounting brackets extend the width of the chassis to 19 in. (48.2 cm).

Cabinet airflow requirements

When you mount the device in a cabinet:

Ensure that ventilation through the cabinet is sufficient to prevent overheating.
Ensure that there is adequate cool air supply to dissipate the thermal output of the device or devices.
Ensure that the hot air exhaust of the chassis exits the cabinet without recirculating into the device. An open cabinet (without a top or doors) that employs hot air exhaust extraction from the top ensures 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.
Install the device in the cabinet in a way that maximizes the open space on the side of the chassis that has the hot air exhaust.
Route and secure all cables to minimize the blockage of airflow to and from the chassis.
Ensure that the spacing of rails and adjacent cabinets is such that proper clearance exists around the device and cabinet.
A cabinet larger than the minimum required provides better airflow and reduces the chance of overheating.

Clearance Requirements for Airflow and Hardware Maintenance for SRX4700

When planning the site for installing a SRX4700, follow these clearance requirements (see Figure 1):

For the cooling system to function properly, ensure that the airflow around the chassis is unrestricted.
If you are mounting the router on a rack or cabinet along with other equipment, ensure that the hot air exhaust from other equipment does not blow into the cold air intake vents of the chassis.
DC NEBS GR-3160 recommends that you allow at least 30 in. (76.2 cm) in front of the rack or cabinet for chassis replacement and 24 in. (61 cm) in rear for component replacement.

Figure 1: Clearance Requirements for Airflow and Hardware Maintenance for SRX4700

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