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MX204 Site Guidelines and Requirements

MX204 Router Physical Specifications

Table 1 summarizes the physical specifications for the router.

Table 1: Router Physical Specifications

Description

Weight

Width

Depth

Height

Chassis fully loaded with all FRUs

AC-powered chassis: 22.7 lb (10.3 kg)

19 in. (48.26 cm)

18.50 in. (47.0 cm)

20.43 in. (51.89 cm) with fan and power handles

1.72 in. (4.37 cm; 1 U)

Fan tray

1.5 lb (0.68 kg)

1.89 in. (4.8 cm)

5.78 in. (14.68 cm)

1.64 in. (4.17 cm)

AC power supply

2.2 lb (1 kg)

2.23 in. (5.66 cm)

14.50 in. (36.83 cm)

1.58 in. (4.01 cm)

DC power supply

2.2 lb (1 kg)

2.23 in. (5.66 cm)

14.53 in. (36.91 cm)

1.67 in. (4.24 cm)

See Also

MX204 Router Environmental Specifications

Table 2 specifies the environmental specifications required for normal router operation. In addition, the site should be as dust-free as possible.

Table 2: Router Environmental Specifications

Description

Value

Altitude

No performance degradation up to 10,000 ft (3048 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)

  • Short-term operation ensured in temperature range of 23° F (–5° C) through 131° F (55° C).

    Note:

    As defined in NEBS GR-63-CORE, Issue 4, short-term events can be up to 96 hours in duration but not more than 15 days per year.

  • 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

1705 BTU/hour (500 W)
Note:

Install the router only in restricted-access 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.

See Also

MX204 Router Grounding Specifications

Grounding Points Specifications

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 and DC-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 1 shows the grounding point location on the router.

A protective earthing terminal bracket is required for connecting the chassis to earth ground. This two-holed bracket attaches on the side of the chassis through the mounting rail and provides a protective earthing terminal for the router. The grounding points are studs sized for 10–32 screws. The 10–32 screws are provided with the MX204 router. The grounding points are spaced at 0.75-in. (19.1-mm) centers.

Two threaded holes are provided on the rear left side of the chassis for connecting the router to earth ground. The grounding points fit 10–32 screws.

Note:

Additional grounding is provided to an AC-powered router when you plug its power supply modules into grounded AC power receptacles.

You must install the MX204 router in a restricted-access location and ensure that the chassis is always properly grounded. The MX204 router has a two-hole protective grounding terminal provided on the chassis. See Figure 1. We recommend that you use this protective grounding terminal as the preferred method for grounding the chassis regardless of the power supply configuration. However, if additional grounding methods are available, you can also use those methods. For example, you can use the grounding wire in the AC power cord or use the grounding terminal or lug on a DC power supply. This tested system meets or exceeds all applicable EMC regulatory requirements with the two-hole protective grounding terminal.

Figure 1: Grounding Points on the Router Grounding Points on the Router

Grounding Cable Lug Specifications

You must provide one grounding cable lug that attaches to the grounding cable and 10–32 screws used to secure 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 LCD10-10A-L or equivalent (not provided). The grounding lug accommodates 12 AWG (2.5 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 module. Minimum recommendations are 12 AWG (2.5 mm²) stranded wire, 60° C wire, or as permitted by local code.

See Also

MX204 Router Rack Requirements

The MX204 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: Rack Requirements and Specifications for an MX204 Router

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 19-in. wide 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 of one of the following standard depths:

    • 23.6 in. (600 mm)

    • 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 MX204 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.

  • 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 1.72 in. (4.37 cm) is approximately 1 U (rack unit).

  • The rack must be strong enough to support the weight of the fully configured router, up to 22.7 lb (10.3 kg).

  • 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 23.62 in. (600 mm) and 31.5 in. (800 mm) front to back.

  • Ensure that the spacing of rails and adjacent racks allows for the proper clearance around the router and rack.

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.

See Also

MX204 Router Cabinet Requirements and Specifications

Table 4 summarizes cabinet requirements and specifications for the MX204 router.

Table 4: Cabinet Requirements and Specifications for an MX204 Router

Cabinet Requirement

Guidelines for the MX204 Router

Cabinet size and clearance

  • The minimum-sized cabinet that can accommodate the router is 19-in. (482-mm) wide, and 23.62-in. (600-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 1 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 MX204 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 2.

  • 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 MX204 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 2: Airflow Through MX204 ChassisAirflow Through MX204 Chassis

See Also

MX204 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 side-cooled 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 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. NEBS GR-63 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: MX204 Chassis Dimensions and Clearance RequirementsMX204 Chassis Dimensions and Clearance Requirements