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ACX7509 Site Guidelines and Requirements

SUMMARY The proper function of the ACX7509 router 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 ACX7509 routers.

Environmental Requirements and Specifications for ACX7509 Routers

You must install the router in a rack or cabinet 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 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, and the router temperature monitor might shut down the device to protect the hardware components.

Table 1 lists the environmental conditions required for normal router operation.

Table 1: ACX7509 Router Environmental Tolerances




6000 ft (1828 m)

Relative operating humidity

5% to 90% (noncondensing)

Relative nonoperating humidity

5% to 95% (noncondensing)

Nominal operating temperature

0° C to 40° C (32° F to 104° F)

Shipping and storage temperature

-40° C to 70° C (-40° F to 158° F)

Pollution degree

2 (IEC 60950)

Seismic tolerance

Complies with Zone 4 earthquake requirements according to NEBS GR-63-CORE, Issue 4.


Install ACX 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 the 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.

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.

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

Table 2: Site Electrical Wiring Guidelines

Site Wiring Factor


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.

ACX7509 Grounding Cable and Lug Specifications

For installations that require a separate grounding conductor to the chassis, you must ground the router before you connect power. Grounding the router ensures proper operation and meets safety and electromagnetic interference (EMI) requirements. To ground an ACX7509 router, connect a grounding cable to earth ground, and then attach the grounding cable to the chassis grounding point.


The router is pluggable type A equipment installed in a restricted-access location. It has a separate protective earthing terminal on the chassis in addition to the grounding pin of the power supply cord. This separate protective earthing terminal must be permanently connected to earth ground for installations that require a separate grounding conductor to the chassis.


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


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


You must ensure that all cables are rated for the environment in which they are deployed.

For an ACX7509 router, you need a grounding cable and straight lug with dual holes. You also need a dual-hole straight lug connector. The grounding lug accommodates 4 AWG (10 mm²), minimum 90° C wire, or as required by the local code.

Clearance Requirements for Airflow and Hardware Maintenance of ACX7509 Routers

When planning the site for installing an ACX7509 router, you must allow sufficient clearance around the installed chassis. See Figure 1.

Figure 1: Clearance Requirements for Hardware Maintenance of ACX7509 Routers Clearance Requirements for Hardware Maintenance of ACX7509 Routers

Ensure that your installation of the ACX7509 router chassis meets the following requirements:

  • For the cooling system to function properly, the airflow around the chassis must be unrestricted. See Cooling System and Airflow in ACX7509 Routers for more information about the airflow through the chassis.

  • If you are mounting an ACX7509 router 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.

  • For service personnel to remove and install hardware components, and to accommodate the interface and power cable bend radius, allow at least 24 in. (61 cm) of space both at the front and the rear of the router. NEBS GR-63 recommends that you allow at least 30 in. (76.2 cm) behind (at the rear of) the router.

  • The chassis and cables must not interfere with the cooling of other systems in the rack. Use fillers in the rack as needed to ensure that heated exhaust air is not recirculated to the front of the rack. Ensure that cables don't block airflow or cause recirculation of heated air toward the router chassis.