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SRX4100 Site Guidelines and Requirements

General Site Installation Guidelines

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

  • 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.

  • Follow prescribed airflow guidelines to ensure that the cooling system functions 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.

  • Keep the area around the chassis clear and free from dust.

SRX4100 Services Gateway Environmental Specifications

Table 1 provides the required environmental conditions for normal SRX4100 Services Gateway operations. In addition, the site must be as dust-free as possible because dust can clog air intake vents, reducing the efficiency of the cooling system.

Table 1: Environmental Specifications




No performance degradation up to 6,562 feet (2000 meters).

Relative humidity

Normal operation ensured in relative humidity range of 5% through 90%, noncondensing.


  • 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).

Site Electrical Wiring Guidelines

Table 2 describes the factors you must consider while planning the electrical wiring 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

Site Wiring Factor


Signaling limitations

To ensure that signaling functions optimally:

  • Install wires correctly.

    Improperly installed wires can emit radio interference.

  • Do not exceed the recommended distances or pass wires between buildings.

    The potential for damage from lightning strikes increases if wires exceed recommended distances or if wires pass between buildings.

  • Shield all conductors.

    The electromagnetic pulse (EMP) caused by lightning can damage unshielded conductors and destroy electronic devices.

Radio frequency interference (RFI)

To reduce or eliminate the emission of RFI from your site wiring:

  • Use twisted-pair cable with a good distribution of grounding conductors.

  • Use a high-quality twisted-pair cable with one ground conductor for each data signal when applicable, if you must exceed the recommended distances.

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:

  • 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.


If your site is susceptible to problems with EMC, particularly from lightning or radio transmitters, you might want to seek expert advice.


Some ports are designed for use as intrabuilding interfaces only Type 2 or Type 4 ports, the battery return connection is to be treated as an Isolated DC return (that is, DC-I), as defined in GR-1089-CORE and require isolation from the exposed OSP cabling. To comply with NEBS requirements and protect against lightning surges and commercial power disturbances, the intrabuilding port(s) of the device MUST NOT be metallically connected to interfaces that connect to the OSP or its wiring. The intrabuilding port(s) of the device is suitable for connection to intrabuilding or unexposed wiring or cabling only. The addition of primary protectors is not sufficient protection to connect these interfaces metallically to OSP wiring.

SRX4100 Services Gateway Physical Specifications

The SRX4100 Services Gateway chassis is a rigid sheet metal structure that houses all the components. Table 3 lists the physical specifications of the SRX4100 Services Gateway chassis.

Table 3: Physical Specifications for the Services Gateway Chassis



Chassis height

1.75 in. (4.45 cm)

Chassis width

17.48 in. (44.40 cm)

Chassis depth

25 in. (63.50 cm)


  • Services gateway with 2 AC power supplies: 29 lb (13.15 kg)

  • Services gateway with 2 DC power supplies: 28.8 lb (13.06 kg)

  • AC power supply: 2.3 lb (1.04 kg)

  • DC power supply: 2.2 lb (0.99 kg)

You can mount the SRX4100 Services Gateway on a standard 19-in. four-post rack or in a standard 19-in. enclosed cabinet.

Clearance Requirements for Airflow and Hardware Maintenance for SRX4100 Services Gateways

When planning the installation site, you need to allow sufficient clearance around the services gateway. Consider the following:

  • For the cooling system to function properly, the airflow around the chassis must be unrestricted. See Figure 1.

    Figure 1: Airflow Through the ChassisAirflow Through the Chassis
  • If you are mounting the services gateway 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.

  • For service personnel to remove and install hardware components, there must be adequate space at the front and back of the services gateway as indicated in Table 4.

Table 4 provides information about the clearance requirements for maintaining optimum airflow and the distances necessary to facilitate easy maintenance of the services gateway.

Table 4: Clearance Requirements for the SRX4100 Services Gateway


Recommended Clearance

Requirement for Clearance

Front of the chassis

34.25 in. (87 cm)

Space for service personnel to remove and install hardware components

Rear of the chassis

17.4 in. (44.2 cm)

Space for service personnel to remove and install hardware components

Between front-mounting flange and rack or cabinet edge

2.5 in. (6.35 cm)

Space for cable management and organization

Between both sides of the chassis and any non-heat-producing surface such as a wall or cabinet side

6.0 in. (15.24 cm)

Space for the cooling system to function properly and to maintain unrestricted airflow around the chassis

SRX4100 Services Gateway Rack Requirements

The SRX4100 Services Gateway is designed to be installed on four-post racks. Table 5 provides the rack requirements and specifications for the services gateway.

Table 5: Rack Requirements

Rack Requirement


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 device can be mounted in any rack that provides holes spaced at that distance.

Rack size and strength

  • Ensure that the rack complies with the size and strength standards of a 19-in. rack as defined in Cabinets, Racks, Panels, and Associated Equipment (document number EIA-310–D) published by the Electronics Industry Association (

  • The rack must be strong enough to support the weight of the services gateway.

  • Ensure that the spacing of rails and adjacent racks provides for proper clearance around the services gateway 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 for maximum stability.

Cabinet Requirements for SRX4100 Services Gateways

You can install the SRX4100 Services Gateway in a 19 in. (48.7 cm) cabinet. Table 6 provides the cabinet requirements and specifications.

Table 6: Cabinet Requirements and Specifications

Cabinet Requirement


Cabinet size

You can mount the services gateway in a cabinet that contains a 19-in. rack as defined in Cabinets, Racks, Panels, and Associated Equipment (document number EIA-310–D) published by the Electronics Industry Association (

Cabinet clearance

  • The outer edges of the mounting brackets extend the width of the chassis to 19 in. (48.2 cm).

  • 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 services gateway in a cabinet, you must ensure that ventilation through the cabinet is sufficient to prevent overheating.

  • 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.

  • Ensure adequate cool air supply to dissipate the thermal output of the services gateway.

  • Route and dress all cables to minimize the blockage of airflow to and from the chassis.

  • A cabinet larger than the minimum required provides better airflow and reduces the chance of overheating.