ACX7020 Site Guidelines and Requirements

Environmental Requirements and Specifications for ACX7020 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:

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, and the router temperature monitor might shut down the device to protect the hardware components.
For outside plant installation (OSP) or indoor non-office environment, you must protect the router against dust, fog, salt fog, pests, moisture, and other airborne contaminants. For OSPs, we recommend that you install the device in a sealed cabinet such as an IP65-IP66 cabinet with a heat exchanger. The cabinet must also comply with Telcordia GR487 specification.

Note: The sealed cabinet should always remain closed. However, if the cabinet door is opened for any maintenance service, ensure that the door remains open only for the minimum required service time. If the cabinet door remains open for an extended period, outside contaminants (such as dust and moisture) can enter the cabinet and affect the functioning of the device within the cabinet.

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

Table 1: ACX7020 Router Environmental Tolerances
Description	Tolerance
Altitude	Up to 6000 ft (1828 m) at 65 °C ambient temperature Up to 1000 ft (304.8 m) at 70 °C ambient temperature
Relative operating humidity	5% to 90% (noncondensing)
Operating temperature	–40 °F (–40 °C) through 158 °F (70 °C)
Shipping and storage temperature	–40 °F (–40 °C) through 158 °F (70 °C)

General Site Guidelines

Efficient device operation requires proper site planning. For the device to operate properly, you must 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 2 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 2: 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 occurring when wires exceed recommended distances or pass between buildings. Damage to unshielded conductors and electronic devices as a result of electromagnetic pulses (EMPs) caused by lightning.
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 need 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.

Chassis Physical Specifications for ACX7020 Routers

The ACX7020 router chassis is a rigid sheet-metal structure that houses the hardware components. The table below summarizes the physical specifications of ACX7020 routers.

Table 3: Physical Specifications for ACX7020 Router Chassis
Item	Height	Width	Depth	Weight
ACX7020	1.72 in. (4.37 cm)	17.36 in. (44.09 cm)	9.25 in. (23.5 cm)	4.45 kg (9.8 lb)

Grounding Cable and Lug Specifications for ACX7020 Routers

For installations that require a separate grounding conductor to the chassis, you must ground the router properly before you connect power. Grounding ensures proper operation and satisfies safety and electromagnetic interference (EMI) requirements. To ground an ACX7020 router, connect a grounding cable to earth ground, and then attach the grounding cable to the chassis grounding points.

CAUTION:

Before you install the router, a licensed electrician must attach a cable lug to the grounding cables that you supply. See Connect Earth Ground to ACX7020 Routers. A cable with an incorrectly attached lug can damage the router.

The ACX7020 router uses a Panduit LCD6-14AF grounding lug, and the grounding lug accommodates a 6 AWG, 90 °C wire (yellow green), or as required by local electric code.

Rack Requirements for ACX7020 Routers

We've designed the ACX7020 routers to be installed on two-post racks. Table 4 provides the rack requirements and specifications for ACX7020 routers.

Table 4: Rack Requirements and Specifications
Rack Requirement	Guidelines
Rack type	Use a two-post 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 you can mount the device in any rack that provides holes that are 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 by the Electronic Components Industry Association (http://www.ecianow.org). 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 of the chassis to 19-in. (48.2 cm). The rack must be strong enough to support the weight of the device. The fully configured ACX7020 router weighs about 9.8 lb (4.45 kg). Ensure that the spacing of rails and adjacent racks provides for proper clearance around the device and rack.
Securing rack to building structure	If your geographical area is earthquake-prone, secure the rack to the floor. Secure the rack to the ceiling brackets as well as wall or floor brackets for maximum stability.

Cabinet Requirements for ACX7020 Routers

Table 5 provides the cabinet requirements and specifications.

Table 5: Cabinet Requirements and Specifications
Cabinet Requirement	Guidelines
Type and strength	Inside the cabinet, use a two-post 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).
Cabinet airflow requirements	When you mount the device in a cabinet, ensure that ventilation through the cabinet is sufficient to prevent overheating. Ensure 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 help remove 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 dress 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 there is proper clearance around the device and cabinet. A cabinet larger than the minimum required provides better airflow and reduces the chance of overheating.
Securing cabinet to building structure	If your geographical area is earthquake-prone, secure the cabinet to the floor. Secure the cabinet to the ceiling brackets as well as wall or floor brackets for maximum stability.

Clearance Requirements for Hardware Maintenance of ACX7020 Routers

When planning the site for installing an ACX7020, you must allow sufficient clearance around the installed chassis

Figure 1: Clearance Requirements for Hardware Maintenance of ACX7020 Routers

For the cooling system to function properly, the airflow around the chassis must be unrestricted. See Cooling System and Airflow in ACX7020 Routers for more information about the airflow through the chassis.
If you are mounting an ACX7020 router in a rack that has other equipment installed, ensure that the exhaust from other equipment does not blow into the intake vents of the chassis.
Leave adequate space at the front of the router for service personnel to remove and install hardware components. Allow at least 24 in. (61 cm) of space at the front and the rear of the router.

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