EX9253 Site Guidelines and Requirements
Environmental Requirements and Specifications for an EX9253 Switch
The switch must be installed in a rack or cabinet housed in a dry, clean, well-ventilated, and temperature-controlled environment.
Ensure that these environmental guidelines are followed:
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 switch to protect the hardware components.
Table 1 provides the required environmental conditions for normal switch operation.
Table 1: EX9253 Switch Environmental Tolerances
Description | Value |
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Altitude | No performance degradation up to 10,000 ft (3048 m) |
Relative humidity | Normal operation ensured in relative humidity range of 5% through 90%, noncondensing |
Temperature | Normal operation ensured in temperature range of 32° F (0° C) through 104° F (40°C) Nonoperating storage temperature in shipping container: – 40° F (–40°C) through 158° F (70°C) |
Seismic | Designed to meet Telcordia Technologies Zone 4 earthquake requirements |
Maximum thermal output (500 W) | 1705 BTU/hour |
Install EX Series switches 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 and proper layout of the equipment, rack or cabinet (if used), 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 and 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.
Site Electrical Wiring Guidelines
Table 2 describes the factors you must consider while planning the electrical wiring at your site.
You must provide a properly grounded and shielded environment and use electrical surge-suppression devices.
Table 2: Site Electrical Wiring Guidelines
Site Wiring Factor | Guidelines |
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Signaling limitations | If your site experiences any of the following problems, consult experts in electrical surge suppression and shielding:
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Radio frequency interference | To reduce or eliminate RFI from your site wiring, do the following:
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Electromagnetic compatibility | If your site is susceptible to problems with electromagnetic compatibility (EMC), particularly from lightning or radio transmitters, seek expert advice. Some of the problems caused by strong sources of electromagnetic interference (EMI) are:
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Clearance Requirements for Airflow and Hardware Maintenance for an EX9253 Switch
When planning the site for installing an EX9253 switch, you must allow sufficient clearance around the switch.
For the cooling system to function properly, the airflow around the chassis must be unrestricted. Allow at least 6 in. (15.2 cm) of clearance between side-cooled switches. Allow 2.8 in. (7.1 cm) between the side of the chassis and any non-heat-producing surface such as a wall. See Figure 1.
If you are mounting the switch on a rack or cabinet along with other equipment, ensure that the exhaust from other equipment does not blow into the intake vents of the chassis.
Airflow must always be from front-to-back with respect to the rack. The switch must not interfere with the cooling of other systems in the rack. Fillers must be used as appropriate in the rack to ensure there is no recirculation of heated exhaust air back to the front of the rack. Care must also be taken around cables to ensure that no leakage of air in situations where recirculation may result.
To accommodate power cable bend radius at the rear of the chassis and the interface cable bend radius at the front of the chassis, provide at least 2.75 in. (7 cm) at the rear and 3.5 in. (8.9 cm) at the front.
For service personnel to remove and install hardware components, there must be adequate space at the front and back of the switch. At least 24 in. (61 cm) is required both in front of and behind the switch. NEBS GR-63 recommends that you allow at least 30 in. (76.2 cm) in front of the rack and 24 in. (61.0 cm) behind the rack.
Figure 1 shows the clearance requirement for an EX9253 switch chassis.
Figure 1: Clearance Requirements for Airflow and Hardware Maintenance for an EX9253 Switch Chassis
Rack and Cabinet Requirements for EX9253 Switches
You can mount an EX9253 switch on four-posts of a 19-in rack or in a cabinet that contains a 19-in. rack.
Rack requirements consist of:
Rack type
Mounting bracket hole spacing
Rack size and strength
Rack connection to the building structure
Table 3 provides the rack requirements and specifications.
Table 3: Rack Requirements and Specifications
Rack Requirement | Guidelines |
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Rack type | You can mount the device on a rack that provides bracket holes or hole patterns spaced at 1 U (1.75 in. or 4.45 cm) increments and meets the size and strength requirements to support the weight. A U is the standard rack unit defined by the Electronic Components Industry Association (http://www.ecianow.org). |
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 device can be mounted in any rack that provides holes spaced at that distance. |
Rack size and strength |
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Rack connection to building structure |
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Cabinet requirements consist of:
Cabinet size
Clearance requirements
Cabinet airflow requirements
Table 4 provides the cabinet requirements and specifications.
Table 4: Cabinet Requirements and Specifications
Cabinet Requirement | Guidelines |
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Cabinet size |
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Cabinet clearance | The minimum total clearance inside the cabinet is 30 in. (76.2 cm) between the inside of the front door and the inside of the rear door. |
Cabinet airflow requirements | When you mount the device in a cabinet, ensure that ventilation through the cabinet is sufficient to prevent overheating.
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