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MX304 Site Guidelines and Requirements

MX304 Router Environmental Specifications

Refer to Table 1 for the environmental specifications required for normal router operation. Also, make sure the site is as dust-free as possible.

Table 1: Router Environmental Specifications

Description

Value

Altitude

No performance degradation up to 6,000 ft (1,800 m).

Relative humidity

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

Temperature

Normal operation ensured in temperature range of 32°F (0°C) through 104°F (40°C).

Nonoperating storage temperature in shipping container: –40°F (–40°C) through 158°F (70°C).

Seismic

Designed to meet Telcordia Technologies Zone 4 earthquake requirements.

Maximum thermal output (1200 W)

Note:

This specification assumes there are two Routing Engines and two LMICs with 32x 100 Gigabit Ethernet transceivers at 5 W each at 25°C.

1200 W * 3.412 = 4095 BTU/hour.
Note:

Install the router 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.

MX304 Router Grounding Specifications

Specifications for Grounding Points

To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, the router must be adequately grounded before power is connected. To ground AC-powered, DC-powered, and HVDC/AC-powered routers, you must connect a grounding cable to earth ground and then attach it to the chassis grounding points by using the two screws provided.

Figure 2 shows the grounding point location on the router.

You need a protective earthing terminal bracket for connecting the chassis to earth ground. This two-holed bracket attaches on the rear of the chassis and provides a protective earthing terminal for the switch. The grounding points are studs sized for M6 hex screws. The accessory kit includes the M6 hex screws with integrated washers. The grounding points are spaced at 0.63-in. (16-mm) centers.

There are two threaded holes on the rear side of the chassis for connecting the router to earth ground. The grounding points fit M6 pan head screws.

Note:

Additional grounding is provided to an AC-powered router when you plug its power supplies into grounded AC power receptacles.
Figure 1: Grounding Point on the MX304 Router Grounding Point on the MX304 Router

Grounding Cable Lug Specifications

The accessory box shipped with the router includes the grounding lug and the M6 hex screws for securing the grounding cable to the grounding points.

CAUTION:

Before you install the router, 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 router.

Grounding Cable Specifications

The grounding lug required is a Panduit LCD6-14A-L or equivalent (provided). The grounding lug accommodates #6 AWG (4.11 mm²) stranded wire. The grounding cable that you provide for the chassis must be the same size or heavier than the input wire of each power supply. Minimum recommendations are 6 AWG (4.11 mm²) stranded wire, 60°C wire, or as permitted by local code.

Figure 2: Grounding Lug Grounding Lug

MX304 Router Clearance Requirements for Airflow and Hardware Maintenance

When planning the installation site, allow sufficient clearance around the rack (see Figure 3):

  • For the cooling system to function properly, the airflow around the chassis must be unrestricted. Allow at least 6 in. (15.2 cm) of clearance between routers. Allow 2.8 in. (7 cm) between the side of the chassis and any non-heat-producing surface such as a wall.

  • For service personnel to remove and to install hardware components, there must be adequate space at the front and back of the router. At least 24 in. (61 cm) are required both in front of and behind the router. It is recommends that you allow at least 30 in. (76.2 cm) in front of the rack and 24 in. (61 cm) behind the router.

  • To accommodate power cable bend radius at the rear of the chassis and the interface cable bend radius at the front of the chassis, provide at least 2.75 in. (7 cm) at the rear and 3.5 in. (8.9 cm) at the front.

Figure 3: MX304 Chassis Dimensions and Clearance Requirements (for a Rack Enclosure) MX304 Chassis Dimensions and Clearance Requirements (for a Rack Enclosure)
Figure 4: MX304 Clearance Requirements for Airflow MX304 Clearance Requirements for Airflow
Figure 5: MX304 Clearance Requirements for Maintenance (with the Air Filter and Cover) MX304 Clearance Requirements for Maintenance (with the Air Filter and Cover)
Figure 6: MX304 Clearance Requirements for Maintenance (without the Air Filter and Cover) MX304 Clearance Requirements for Maintenance (without the Air Filter and Cover)

MX304 Router Physical Specifications

Table 2 summarizes the physical specifications for the router.

Table 2: Router Physical Specifications

Description

Weight

Width

Depth

Height

Chassis fully loaded with all FRUs (two Routing Engines and two LMICs)

AC-powered chassis: 70.54 lb (32 kg)

17.36 in. (44.08 cm)

30.78 in. (78.2 cm) with the cable management brackets, and handles for fans and power supplies

3.5 in. (8.89 cm; 2 U)

DC-powered chassis: 70.54 lb (32 kg)

17.36 in. (44.08 cm)

30.78 in. (78.2 cm) with the cable management brackets, air filter unit, and handles for fans and power supplies

3.5 in. (8.89 cm; 2 U)

HVAC/DC-powered chassis: 70.54 lb (32 kg)

17.36 in. (44.08 cm)

30.78 in. (78.2 cm) with the cable management brackets,and handles for fans and power supplies

3.5 in. (8.89 cm; 2 U)

Chassis without any FRUs

35.27 lb (16 kg)

17.36 in. (44.08 cm)

24.01 in. (61 cm) without the cable management brackets, air filter unit, and handles for fans and power supplies

3.5 in. (8.89 cm)

LMIC (model number: MX304-LMIC16-BASE;

6.17 lb (2.8 kg)

8.01 in. (20.35 cm)

13.07 in. (33.2 cm)

1.58 in. (4.01 cm)

Routing Engine

3.41 lb (1.55 kg)

8.01 in. (20.35 cm)

8. in. (20.32 cm)

1.58 in. (4.01 cm)

Fan module

1.32 lb (.60 kg)

0.31 in. (0.80 cm)

5.62 in. (14.3 cm)

0.31 in. (0.78 cm)

AC power supply

2.42 lb (1.1 kg)

2.89 in. (7.35 cm)

7.81 in. (19.85 cm)

1.57 in. (4.01 cm)

DC power supply

2.42 lb (1.1 kg)

2.89 in. (7.35 cm)

7.81 in. (19.85 cm)

1.57 in. (4.01 cm)
HVAC/DC power supply

2.42 lb (1.1 kg)

2.89 in. (7.35 cm)

7.81 in. (19.85 cm)

1.57 in. (4.01 cm)
JNP-FLTRDR-2RU 3.25 lb (1.47 kg) 18.9 in. (48.2 cm) 5.31 in. (13.5 cm) 3.46 in. (8.8 cm)
JNP-AIRFLTR-2RU 0.2 lb (0.09 kg) 17.32 in. (44 cm) 0.2 in. (0.60 cm) 0.78 in. (1.98 cm)
JNP304-BLNK 0.9 lb (0.40 kg) 8.01 in. (20.35 cm) 2.79 in. (7.1 cm) 1.58 in. (4.01 cm)
JNP-CABLEMGMT-2RU 1.0 lb (0.45 kg) 0.98 in. (2.5 cm) 5.01 in. (12.75 cm) 3.42 in. (8.70 cm)
Note:

For router maintenance and to accommodate power cable bend radius, allow at least 30 in. (76.2 cm) in front of the rack and 24 in. (61 cm) behind the router (see MX304 Router Clearance Requirements for Airflow and Hardware Maintenance).

MX304 Router Rack Requirements

The router can be installed in a standard 19-in. rack. Many types of racks are acceptable, including four-post (telco) racks and open-frame racks. Table 3 summarizes rack requirements and specifications for the router.

Table 3: Router Rack Requirements and Specifications

Rack Requirement

Guidelines

Rack type and mounting bracket hole spacing

Use a four-post rack. You can mount the router on any four-post rack that provides bracket holes or hole patterns spaced at 1 U (1.75-in./4.44-cm) increments and that meets the size and strength requirements specified in this table.

A U is the standard rack unit defined in Cabinets, Racks, Panels, and Associated Equipment (document number EIA-310–D) published by the Electronics Components Industry Association (http://www.ecianow.org/).

Rack size and strength

  • Ensure that the rack is a 19-in. rack as defined in Cabinets, Racks, Panels, and Associated Equipment (document number EIA-310–D) published by the Electronics Components Industry Association (http://www.ecianow.org/).

  • Ensure that the rack is one of the following standard lengths:

    • 30.0 in. (762 mm)

    • 31.5 in. (800 mm)

  • The rack rails must be spaced widely enough to accommodate the router chassis's external dimensions (see MX304 Router Physical Specifications). The outer edges of the mounting brackets extend the width to 19 in. (48.3 cm). The spacing of rails and adjacent racks must also allow for the clearances around the router and rack that are specified in MX304 Router Clearance Requirements for Airflow and Hardware Maintenance.

  • The router ships with the front-mounting brackets fixed in the front-mount position on the chassis. You can move the rear-mounting brackets based on the depth of the rack.

  • The chassis height of 3.5 in. (8.89 cm) is approximately 2 U (rack unit).

  • The rack must be strong enough to support the weight of the fully configured router.

  • Either end of the router must be mounted flush with the rack and still be adjustable for racks with different depths. The front and rear rack rails must be spaced between 23.6 in. (60 cm) and 31.4 in. (80 cm) front to back.

  • Ensure that the spacing of rails and adjacent racks allows for the proper clearance around the router and rack as specified in MX304 Router Clearance Requirements for Airflow and Hardware Maintenance.

    Note:

    The rack must be strong enough to support the weight of the fully loaded router.

Rack connection to the building structure

  • Secure the rack to the building structure.

  • If earthquakes are a possibility in your geographic area, secure the rack to the floor.

  • Secure the rack to the ceiling brackets as well as wall or floor brackets for maximum stability.

MX304 Router Cabinet Requirements and Specifications

Table 4 summarizes cabinet requirements and specifications for MX304 router.

Table 4: Cabinet Requirements and Specifications for an MX304 Router

Cabinet Requirement

Guidelines for the MX304 Router

Cabinet size and clearance

  • The minimum-sized cabinet that can accommodate the router is 19-in. (482-mm) wide, and 30.0-in. (762-mm) deep. A cabinet larger than the minimum requirement provides better airflow and reduces the chance of overheating. If you provide adequate cooling air and airflow clearance, you can stack several routers in a cabinet that has sufficient usable vertical space. Each router requires 2 U.

    A U is the standard rack unit defined in Cabinets, Racks, Panels, and Associated Equipment (document number EIA-310-D) published by the Electronic Components Industry Association (ECIA) (http://www.ecianow.org).

  • With adequate cooling air and airflow clearance, you can stack multiple MX304 routers in a cabinet with a four-post rack. In all cases, the rack must meet the strength requirements to support the weight.

  • The minimum total clearance inside the cabinet is 30.7 in. (780 mm) between the inside of the front door and the inside of the rear door.

Cabinet airflow requirements

When you install the router in a cabinet, you must ensure that ventilation through the cabinet is sufficient to prevent overheating. Consider the following requirements to when planning for chassis cooling:

  • Airflow must always be from front to back with respect to the rack. If the device has side to rear airflow, then provisions must be made to ensure that fresh air from the front of the rack is supplied to the inlets, and exhaust exits from the rear of the rack. The device must not interfere with the cooling of other systems in the rack. Fillers must be used as appropriate in the rack to ensure there is no recirculation of heated exhaust air back to the front of the rack. Care must also be taken around cables to ensure no leakage of air in situations where recirculation might result.

  • Ensure that the cabinet allows the chassis hot exhaust air to exit from the cabinet without recirculating into the router. An open cabinet (without a top or doors) that employs hot air exhaust extraction from the top allows the best airflow through the chassis. If the cabinet contains a top or doors, perforations in these elements assist with removing the hot air exhaust. For an illustration of chassis airflow, see Figure 7.

  • Ensure that the cool air supply you provide through the cabinet can adequately dissipate the thermal output of the router.

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

  • Ensure that the spacing of rails and adjacent racks allows for the proper clearance around the router and rack as specified in MX304 Router Clearance Requirements for Airflow and Hardware Maintenance.

  • Install the router as close as possible to the front of the cabinet so that the chassis just clears the inside of the front door. This maximizes the clearance in the rear of the cabinet for critical airflow.
Figure 7: Airflow Through Chassis Airflow Through Chassis