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SRX340 Site Guidelines and Requirements
General Site Installation Guidelines for the SRX340 Services Gateway
The following precautions help you plan an acceptable operating environment for your SRX340 Services Gateway and avoid environmentally caused equipment failures:
For the cooling system to function properly, the airflow around the chassis must be unrestricted. Allow sufficient clearance between the front and back of the chassis and adjacent equipment. Ensure that there is adequate circulation in the installation location.
Follow the ESD procedures to avoid damaging equipment. Static discharge can cause components to fail completely or intermittently over time. For more information, see Preventing Electrostatic Discharge Damage to the SRX340 Services Gateway.
Ensure that a blank Mini-PIM panel is installed in the empty slot to prevent any interruption or reduction in the flow of air across internal components.
SRX340 Services Gateway Environmental Specifications
Table 1 provides the required environmental conditions for normal SRX340 Services Gateway operations.
Table 1: Environmental Specifications for the SRX340 Services Gateway
No performance degradation up to 10,000 ft (3048 m)
5% to 95%, noncondensing
Average power consumption
Average heat dissipation
SRX340 Services Gateway Electrical Wiring Guidelines
Table 2 describes the factors you must consider while planning the electrical wiring for the services gateway at your site.
It is particularly important to provide a properly grounded and shielded environment and to use electrical surge-suppression devices.
Table 2: Site Electrical Wiring Guidelines for the SRX340 Services Gateway
Site Wiring Factor
To ensure that signaling functions optimally:
Radio Frequency Interference (RFI)
To reduce or eliminate the emission of RFI from your site wiring:
Electromagnetic Compatibility (EMC)
Provide a properly grounded and shielded environment and use electrical surge-suppression devices.
Strong sources of electromagnetic interference (EMI) can cause the following damage:
Note: If your site is susceptible to problems with EMC, particularly from lightning or radio transmitters, you may want to seek expert advice.
To comply with intrabuilding lightning/surge requirements, the intrabuilding wiring must be shielded. The shielding for the wiring must be grounded at both ends.
SRX340 Services Gateway Grounding Specifications
To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, the SRX340 Services Gateway must be adequately grounded before power is connected. You must provide a grounding lug to connect the services gateway to earth ground.
Before you connect power to the services gateway, a licensed electrician must attach a cable lug to the grounding and power cables that you supply. A cable with an incorrectly attached lug can damage the services gateway (for example, by causing a short circuit).
The services gateway chassis has one grounding point on the side of the chassis. The grounding point holes fit M5 screws.
Table 3 lists the specifications of the grounding cable used with the device.
Table 3: Grounding Cable Specifications for the Services Gateway
14 AWG single-strand wire cable
Amperage of grounding cable
Up to 4 A
Ring-type, vinyl-insulated TV14-6R lug or equivalent
SRX340 Services Gateway Physical Specifications
Table 4 lists the physical specifications for the services gateway.
Table 4: Physical Specifications for the SRX340 Services Gateway
Physical Specification of Chassis
14.57 in. (37.01 cm)
17.36 in. (44.09 cm)
1.72 in. (4.37 cm)
10.80 lb (4.89 kg)
SRX340 Services Gateway Clearance Requirements for Airflow and Hardware Maintenance
When planning the installation site for the SRX340 Services Gateway, you need to allow sufficient clearance around the device. Consider the following:
For the operating temperature of the services gateway to be optimal, the airflow around the chassis must be unrestricted. The fan tray contains four fans and provides front-to-back chassis cooling.
For service personnel to remove and install hardware components, there must be adequate space at the front and back of the device. Allow at least 24 in. (61 cm) both in front of and behind the device.
If you are mounting the device in a rack with other equipment, or if you are placing it on the desktop near other equipment, ensure that the exhaust from other equipment does not blow into the intake vents of the chassis.
For information on the airflow through the SRX340 Services Gateway chassis, see SRX340 Cooling System.
Rack Requirements for the SRX340 Services Gateway
When installing the services gateway in a rack, you must ensure that the rack complies with a 1U (19 in. or 48.7 cm) rack as defined in Cabinets, Racks, Panels, and Associated Equipment (document number EIA-310-D), published by the Electronic Industries Alliance (http://www.ecaus.org/eia/site/index.html).
When selecting a rack, ensure that the physical characteristics of the rack comply with the following specifications:
The outer edges of the mounting brackets extend the width of either chassis to 19 in. (48.3 cm).
The front of the chassis extends approximately 0.5 in. (1.27 cm) beyond the mounting ears.
Maximum permissible ambient temperature when two devices are placed side by side in a 19 in. rack is 40° C.
The spacing of the mounting brackets and flange holes on the rack and device mounting brackets are as follows:
The holes within each rack set are spaced at 1 U (1.75 in. or 4.5 cm).
The mounting brackets and front-mount flanges used to attach the chassis to a rack are designed to fasten to holes spaced at rack distances of 1 U (1.75 in.).
The mounting holes in the mounting brackets provided with the device are spaced 1.25 in. (3.2 cm) apart (top and bottom mounting hole).
Cabinet Requirements for the SRX340 Services Gateway
You can install the SRX340 Services Gateway in a 19 in. (48.7 cm) cabinet as defined in Cabinets, Racks, Panels, and Associated Equipment (document number EIA-310-D) published by the Electronic Industries Alliance (http://www.ecaus.org/eia/site/index.html). You must mount the services gateway horizontally in the cabinet.
When selecting a cabinet, ensure that it meets the following specifications:
The cabinet is at least 1U (3.50 in. or 8.89 cm) and can accommodate the services gateway.
The outer edges of the mounting brackets extend the width of either chassis to 19 in. (48.7 cm), and the front of the chassis extends approximately 0.5 in. (1.27 cm) beyond the mounting brackets.
The minimum total clearance inside the cabinet is 30.7 in. (78 cm) between the inside of the front door and the inside of the rear door.
A cabinet larger than the minimum required provides better airflow and reduces the chance of overheating.
When you mount the SRX340 Services Gateway in a cabinet, you must ensure that ventilation through the cabinet is sufficient to prevent overheating. Consider the following when planning for chassis cooling:
Ensure that the cool air supply you provide through the cabinet can adequately dissipate the thermal output of the services gateway.
Install the services gateway as close as possible to the front of the cabinet so that the cable management system clears the inside of the front door. Installing the chassis close to the front of the cabinet maximizes the clearance in the rear of the cabinet for critical airflow.
Route and dress all cables to minimize the blockage of airflow to and from the chassis.