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MX104 Site Guidelines and Requirements

MX104 Router Physical Specifications

The MX104 router is a rigid sheet-metal structure that houses the hardware components. Table 1 summarizes the physical specifications of the MX104 router and its components.

Table 1: Physical Specifications of the MX104 Router Chassis

Component

Weight

Width

Height

Depth

Chassis

  • Chassis without power supplies, fan tray, or MICs: 19.56 lb (9 kg)

  • Chassis with power supplies, fan tray, and MICs: 32 lb (14.5 kg)

17.22 in. (43.7 cm)

19.2 in. (48.7 cm) with mounting brackets attached

6.09 in. (15.47 cm)

9.461 in. (24 cm)

Fan tray

1 lb (0.45 kg)

1.48 in. (3.8 cm)

5.39 in. (13.7 cm)

8.58 in. (21.8 cm)

MIC

Maximum up to 1.2 lb (0.54 kg)

6.25 in. (15.9 cm)

1.9 in. (3.28 cm)

7.38 in (18.74 cm)

AC power supply

2.5 lb (1.13 kg)

4 in. (10.16 cm)

1.75 in. (4.45 cm)

8.88 in. (22.55 cm)

DC power supply

3 lb (1.36 kg)

4 in. (10.16 cm)

1.75 in. (4.45 cm)

8.88 in. (22.55 cm)

Routing Engine

8.9 oz (0.3 kg)

4.59 in. (11.66 cm)

0.87 in. (2.2 cm)

7.25 in. (18.42 cm)

MX104 Router Environmental Specifications

The router must be installed in a rack or cabinet housed in a dry, clean, well-ventilated, and temperature-controlled environment.

Ensure that these environmental guidelines are followed:

  • 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, leading to the router temperature monitor shutting down the router to protect the hardware components.

Note:

Depending on the ambient temperature, it may take up to 5 minutes for the router to heat up to the operating temperature.

Table 2 provides the required environmental conditions for normal router operation.

Table 2: MX104 Environmental Specifications

Description

Value

Altitude

No performance degradation to 6,000 ft (1,900 m)

Relative humidity

Normal operation ensured in relative humidity range of 5% to 85%, noncondensing

Temperature

  • Harsh environment: –40° F (–40° C) to 149° F (65° C), de-rate 1° C for every 1000 ft.

  • Central office environment: 23° F (–5° C) to 131° F (55° C)

Commercial grade SFP/SFP+ temperature

  • Harsh environment: –40° F (–40° C) to 122° F (50° C)

  • Central office environment: –40° F (–40° C) to 104° F (40° C)

Seismic

Designed to meet Telcordia Technologies Zone 4 earthquake requirements

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.

Note:

The MX104 complies with GR3108 as Class-2 equipment.

MX104 Chassis Grounding Cable and Lug 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 using two washers and two screws (see Figure 1).

Two threaded holes are provided on the front the router chassis for connecting the router to earth ground. The grounding points fit SAE 10-32 screws (American). The grounding points are spaced at 0.625-in. (15.86-mm) centers.

You must install the MX104 router in a restricted-access location and ensure that the chassis is always properly grounded. The MX104 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 MX104 Routers Grounding Points on the MX104 Routers
Note:

All bare grounding connection points to the router must be cleaned and coated with an antioxidant solution before grounding the router.

Note:

All surfaces on the router that are unplated must be brought to a bright finish and treated with an antioxidant solution before connecting the router.

Note:

All nonconductive surfaces on the router must be removed from all threads and connection points to ensure electrical continuity.

Grounding Cable Lug Specifications

The grounding cable lug is used to secure the grounding cable to the grounding points on the chassis. The grounding cable lug attaches to the grounding cable and is secured to the router by two SAE 10-32 screws. We recommend using washers between the grounding lug and the screws. The grounding cable lug, screws, and washers are supplied with the router. See Figure 2 for AC systems and Figure 3 for 24 VDC systems.

Figure 2: Grounding Cable Lug for MX104 AC SystemsGrounding Cable Lug for MX104 AC Systems
Figure 3: Grounding Cable Lug for MX104 24 VDC SystemsGrounding Cable Lug for MX104 24 VDC Systems
CAUTION:

Before router installation begins, 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.

CAUTION:

The maximum torque rating of the grounding screws on the router is 4.34 lb-in. (0.49 Nm). The grounding screws may be damaged if excessive torque is applied. Use only a torque-controlled driver to tighten screws. Use an appropriately sized driver, with a maximum torque capacity of 5 lb-in. or less. Ensure that the driver is undamaged and properly calibrated and that you have been trained in its use. You may wish to use a driver that is designed to prevent overtorque when the preset torque level is achieved.

Grounding Cable Specifications

You must provide one grounding cable that meets the following specifications:

  • For AC systems, use 14-AWG (2.08 mm2) 90° C wire. See, Figure 2

  • For 24 VDC systems, use 6-AWG (13.3 mm2) 60° C wire, or as required by the local code. See Figure 3

Rack Requirements for MX104 Routers

You can mount the router on two-post racks or four-post racks.

Rack requirements consist of:

  • Rack type

  • Mounting bracket hole spacing

  • Rack size and strength

  • Rack connection to the building structure

Table 3 provides the rack requirements and specifications for the router.

Table 3: Rack Requirements and Specifications for the Router

Rack Requirement

Guidelines

Rack type

Use a two-post rack or a four-post rack. You can mount the router on any two-post or four-post rack that provides bracket holes or hole patterns spaced at 1 U (1.75 in., or 4.45 cm) increments and that meets the size and strength requirements to support the weight.

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/).

The rack must meet the strength requirements to support the weight of the chassis.

Mounting bracket hole spacing

The holes in the mounting brackets are spaced at 1 U (1.75 in., or 4.45 cm) so that the router can be mounted in any rack that provides holes spaced at that distance.

Rack size and strength

  • Ensure that the rack complies with this standard:

    • A 19-in. (48.3 cm) rack as defined in Cabinets, Racks, Panels, and Associated Equipment (document number EIA-310-D) published by the Electronics Industry Association (http://www.eia.org).

  • Ensure that the rack rails are spaced widely enough to accommodate the external dimensions of the router chassis. The outer edges of the front-mounting brackets extend the width of the chassis to 19.2 in. (48.7 cm).

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

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

Rack connection to building structure

  • Secure the rack to the building structure.

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

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

One pair of mounting brackets for mounting the router on two posts of a rack is supplied with each router. For mounting the router on four posts of a rack or cabinet, you can order a four-post rack-mount kit separately.

Cabinet Requirements for MX104 Routers

You can mount the router in a cabinet that contains a 19-in. (48.3 cm) rack.

Cabinet requirements consist of:

  • Cabinet size

  • Clearance requirements

  • Cabinet airflow requirements

Table 4 provides the cabinet requirements and specifications for the router.

Table 4: Cabinet Requirements and Specifications for the MX104 Router

Cabinet Requirement

Guidelines

Cabinet size

  • You can mount the router in a cabinet that contains a 19-in. (48.3 cm) rack as 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).

    Note:

    The rack must meet the strength requirements to support the weight of the router.

  • The minimum cabinet size must be able to accommodate the maximum external dimensions of the router.

Cabinet clearance

  • The outer edges of the mounting brackets extend the width of the chassis to 19 in. (48.3 cm).

  • The minimum total clearance inside the cabinet is 30 in. (76.2 cm) between the inside of the front door and the inside of the rear door.

Cabinet airflow requirements

When you mount the router in a cabinet, ensure that ventilation through the cabinet is sufficient to prevent overheating.

  • Ensure an adequate cool air supply to dissipate the thermal output of the router or routers.

  • Ensure that the cabinet allows the hot exhaust air from the chassis to exit 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.

  • Install the router in the cabinet in a way that maximizes the open space on the side of the chassis that has the hot air exhaust. This space maximizes the clearance for critical airflow.

  • 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 allows for proper clearance around the router and cabinet.

  • A cabinet larger than the minimum required provides better airflow and reduces the chance of overheating.

Clearance Requirements for Airflow and Hardware Maintenance on MX104 Routers

When planning the installation site, allow sufficient clearance around the rack (see Figure 4):

  • 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) is required both in front of and behind the router. NEBS GR-63 recommends that you allow at least 30 in. (72.6 cm) in front of the rack and 24 in. (61.0 cm) behind the router.

Figure 4: MX104 Chassis Dimensions and Clearance RequirementsMX104 Chassis Dimensions and Clearance Requirements