ACX7024 and ACX7024X Site Guidelines and Requirements

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 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.

ACX7024 and ACX7024X Site Electrical Wiring Guidelines

Table 1 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 1: 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: 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.

Warning:

The intrabuilding port(s) (MGMT and CON ports) of the equipment or subassembly must use shielded intrabuilding cabling or wiring that is grounded at both ends.

Chassis Physical Specifications for ACX7024 and ACX7024X Routers

The ACX7024 and ACX7024X router chassis is a rigid sheet-metal structure that houses the hardware components. Chassis Physical Specifications for ACX7024 and ACX7024X Routers summarizes the physical specifications of an ACX7024 and ACX7024X router and its components.

Table 2: Physical Specifications for ACX7024 and ACX7024X Router Chassis and FRUs
Item	Height	Width	Depth	Weight
ACX7024 and ACX7024X	1.75 in. (4.4 cm)	19 in. (48.2 cm)	9.6 in. (24.4 cm)	With FRUs installed: 12.5 lb (5.66 kg) With no FRUs installed: 10 lb (4.55 kg)
PSM	1.57 in. (4.0 cm)	1.97 in. (5.0 cm)	9.0 in. (23.0 cm)	1.3 lb (0.59 kg)

Environmental Requirements and Specifications for ACX7024 Routers

You must install the router in a rack or cabinet. To ensure proper functioning of the router, house it in a dry, clean, well-ventilated, and temperature-controlled environment.

Follow these environmental guidelines:

Keep the site as dust-free as possible. 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 cabinet with 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 3 provides the required environmental conditions for normal router operation.

Table 3: ACX7024 Router Environmental Tolerances
Description	Tolerance
Altitude	No performance degradation up to 6000 feet (1,829 meters)
Relative humidity	Normal operation ensured in relative humidity range of 5% through 90%, noncondensing.
Temperature	Normal operation ensured in temperature range of –40°F through 149°F (–40°C through 65°C). Nonoperating storage temperature in shipping container: –40°F through 158°F (–40°C through 70°C).

Environmental Requirements and Specifications for ACX7024X Routers

You must install the router in a rack or cabinet. To ensure proper functioning of the router, house it in a dry, clean, well-ventilated, and temperature-controlled environment.

Follow these environmental guidelines:

Keep the site as dust-free as possible. 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 4 provides the required environmental conditions for normal router operation.

Table 4: ACX7024X Router Environmental Tolerances
Description	Tolerance
Altitude	No performance degradation up to 6000 feet (1,829 meters)
Relative humidity	Normal operation ensured in relative humidity range of 5% through 90%, noncondensing.
Temperature	Normal operation ensured in temperature range: 32°F through 104°F (0°C through 40°C). Short term operating temperature (GR63-NEBS) environment : 131°F (55°C). Nonoperating storage temperature in shipping container: –40°F through 158°F (–40°C through 70°C).

Grounding Cable and Lug Specifications for ACX7024 and ACX7024X 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 ACX7024 or ACX7024X router, connect a grounding cable to earth ground, and then attach the grounding cable to the chassis grounding points.

The grounding points are in the form of studs that are sized for #10–32 screws.

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 ACX7024 or ACX7024X Routers. A cable with an incorrectly attached lug can damage the router.

The ACX7024 and ACX7024X router uses an LCD6 2-hole grounding lug and the grounding lug accommodates a 6 AWG, 90 °C stranded copper wire (green with yellow insulation), or as required by local electric code.

Clearance Requirements for Hardware Maintenance of ACX7024 and ACX7024X Routers

When planning the site for installing an ACX7024 or ACX7024X router, you must allow sufficient clearance around the installed chassis (see Figure 1).

Figure 1: Clearance Requirements for Hardware Maintenance of ACX7024 and ACX7024X Routers

For the cooling system to function properly, the airflow around the chassis must be unrestricted. See Cooling System and Airflow in ACX7024 and ACX7024X Routers for more information about the airflow through the chassis.
If you are mounting an ACX7024 or ACX7024X 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 to install hardware components. Allow at least 24 in. (61 cm) of space at the front and 6 in. (15.2 cm) at the rear of the router.

Rack Requirements for ACX7024 and ACX7024X Routers

We've designed the ACX7024 and ACX7024X routers to be installed on two-post racks. Table 5 provides the rack requirements and specifications for ACX7024 and ACX7024X routers.

Table 5: 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 ACX7024 or ACX7024X router weighs about 12.5 lb (5.66 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 ACX7024 and ACX7024X Routers

Table 6 provides the cabinet requirements and specifications.

Table 6: Cabinet Requirements and Specifications
Cabinet Requirement	Guidelines
Cabinet size and clearance	The minimum total clearance inside the cabinet is 6 in. (15.2 cm) between the inside of the front door and the inside of the rear door.
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.

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