• Never attempt to lift an object that might be too heavy for you to lift by yourself.
• Always disconnect the power source and unplug all power cables before lifting, moving or working on the chassis.
• Keep the work area clear and dust free during and after installation.
• Keep tools and chassis components away from walk areas.
• Do not wear loose clothing, jewelry (including rings and chains), or other items that could get caught in the chassis.
• Fasten ties or scarfs and sleeves.
• Check that the Cisco CRS 4-slot LCC operates safely when it is used in accordance with its electrical ratings and product usage instructions.
• Do not work alone if potentially hazardous conditions exist.
• Always unplug the power cables when performing maintenance or working on the chassis, unless the replacement part is capable of online insertion and removal (OIR).
• Confirm that the installation of your chassis is in compliance with national and local electrical codes: in the United States, National Fire Protection Association (NFPA) 70, United States National Electrical Code; in Canada, Canadian Electrical Code, part I, CSA C22.1; in other countries, International Electrotechnical Commission (IEC) 364, part 1 through part 7.
• Before installing, configuring, or maintaining the chassis, review the safety warnings listed in Cisco CRS Carrier Routing System Regulatory Compliance and Safety Information, which accompanied your chassis.
• Confirm that the AC powered Cisco CRS 4-slot LCC is shipped with a three-wire electrical grounding-type plug that fits only into a grounding-type power outlet. This is a safety feature. The equipment grounding should be in accordance with local and national electrical codes.

The Cisco CRS 4-slot LCC is designed to meet regulatory, compliance, and safety approval requirements. If you require additional compliance information, see Cisco CRS Carrier Routing System Regulatory Compliance and Safety Information that is shipped with your chassis.

Electrostatic discharge (ESD) damage to chassis components can occur if the parts are handled improperly. Such mishandling can result in intermittent or complete failures of the equipment.

When handling any chassis components, observe the following guidelines to prevent ESD damage.

• Always use an ESD-preventive ankle or wrist strap and ensure that the strap makes adequate contact with your skin.
• The ankle or wrist strap protects equipment from ESD voltages on the body only; ESD voltages on clothing can still cause damage to electronic components.
• Use an ESD antistatic strap and follow its instructions for use.

Caution

Periodically check the resistance value of the antistatic ankle or wrist strap. The resistance measurement should be between 1 and 10 megohms.

Physical Layer Interface Modules (PLIMs) are equipped with lasers, which emit invisible radiation. Do not stare into open PLIM ports.

A fully configured Cisco CRS 4-slot LCC weighs approximately 361 lb. (163.7 kg). Before installing the chassis, ensure that your site is properly prepared so you can avoid having to move the chassis later to accommodate power source and network connections.

Each time you lift any heavy assembly, refer to these lifting guidelines:

• Never attempt to lift an object that might be too heavy for you to lift by yourself
• Have a second person available to help lift the assembly
• Ensure that your footing is solid; balance the weight of the object between your feet
• Lift the assembly slowly; never move suddenly or twist your body as you lift
• To prevent injury to your back, keep your back straight while lifting the shelf and lift the equipment with your legs as you stand up
• If you must bend down to lift the assembly, bend at the knees, not at the waist, to reduce the strain on your lower back muscle
• Always disconnect the power source and unplug all power cables before lifting, moving or working on the chassis

The field replaceable units (FRUs) in the Cisco CRS 4-slot LCC offer online insertion and removal (OIR) capability, which means an FRU is hot swappable and can be removed and replaced while the system is operating without presenting an electrical hazard or damage to the system.

The following FRUs feature OIR:

• MSCs, FPs, and PLIMs
• RPs—Only when two are installed in the chassis
• SFCs
• Air filter

Note	For more information on installing and removing components, see the Cisco CRS Carrier Routing System 4-Slot Line Card Chassis Installation Guide.

Before installing the Cisco CRS 4-slot LCC in a rack, consider the following general rack-mounting guidelines.

• As you face the rear of the chassis, the fan tray assembly is located on the top portion of the chassis. Air flow to the air inlet on the front of the chassis and the rear fan tray assembly should not be blocked.

Note	Warm air exhausts at the back of the chassis through the fan tray. Allow sufficient air flow by maintaining a minimum of 6 inches (15 cm) of clearance at the front and rear of the chassis.

• A ventilation system that is too powerful in an enclosed rack can also prevent cooling by creating negative air pressure around the chassis and redirecting the air away from the air intake vent. If necessary, operate the chassis with the rack door open or in an open rack.
• The correct use of baffles inside an enclosed rack can assist in cooling the chassis.
• Equipment located near the bottom of the rack can generate excessive heat that is drawn upward and into the intake ports of equipment above, leading to possible overheat conditions.

Note	The rack-mounting hardware included with the Cisco CRS 4-slot LCC is suitable for most 19-inch (48-cm) equipment racks.

• For the CRS-4-LCC to meet GR-63-CORE Zone 4 Earthquake Requirements, a 19" rack designed to withstand GR-63-CORE Zone 4 earthquakes for the intended rack weight loading must be used.
• Be sure that the rack is bolted to the floor. The chassis mounts to the two rack posts, and the rest of the chassis is cantilevered off of the posts.
• Ensure that the weight of the chassis does not make the rack unstable.
• Some racks are secured to ceiling brackets, if necessary, because of the weight of the equipment in the rack. Make sure that the rack you are installing the chassis in is secured.
• If mounting the chassis on a four-post rack, it must be recessed no more than 1.5 inches (3 cm) for the front door to fully open and close and to provide adequate room for cable routing.

The figure below shows a top view of the Cisco CRS 4-slot LCC footprint. The front of the chassis is at the top of the figure.

Figure 1. Top View of the 4-Slot Line Card Chassis

Make sure that enough space exists at the installation site to install the line card chassis and allow sufficient airflow. The floor plan must also provide enough room to access chassis components for maintenance (for example, to remove fan trays, power supplies, cables, and the air filter). The figure below shows a typical floor plan and the table below lists the minimum clearances required.

Figure 2. Line Card Chassis Floor Plan

The table below lists the minimum installation and maintenance access clearances required for the chassis.

Note	The most up-to-date clearance requirement information is located in the Cisco CRS Carrier Routing System 4-Slot Line Card Chassis Unpacking, Moving, and Securing Guide.

Note	For front-to-front row alignment and back-to-back row alignment: we recommend that adjacent rows of chassis align the front intake to front intake or rear exhaust to rear exhaust.

This section describes the power and grounding requirements you must consider when planning the site facilities for the line card chassis. In addition, see the AC Power System and the DC Power System for additional power requirements.

Note

A certified electrician should review the information in these sections to ensure that the installation site meets these requirements. For larger system configurations, you may want to consult a facilities electrical expert to understand the load that the routing system may put on the facility power plant.

• Installation of the Cisco CRS 4-slot LCC must follow national and local electrical codes:
• In the United States—United States National Fire Protection Association (NFPA) 70 and United States National Electrical Code (NEC)
• In Canada—Canadian Electrical Code, part I, CSA C22.1
• In other countries—International Electrotechnical Commission (IEC) 60364, parts 1 through 7
• Four separate and independent AC or DC power sources are needed to provide 1+1 redundancy for system power. Each pair of power supplies has its own circuit breaker.
• Each power source must provide clean power to the site. If necessary, install a power conditioner.
• Sites must provide short-circuit (over-current) protection for devices.
• Proper grounding is required at the site to ensure that equipment is not damaged by lightning and power surges. In addition:
• For AC-powered systems, a grounding-type AC power outlet is required.
• For DC-powered systems, the installation must have a ground connection of the appropriate gauge to the DC power shelf ground lug.
• When planning power for the site, be sure to include the power requirements for any external terminals and test equipment you will use with your system.

Note	Be sure to review the safety warnings in Cisco CRS Carrier Routing System Regulatory Compliance and Safety Information.

This section offers site wiring guidelines for setting up the plant wiring and cabling at your site. When planning the location of the new system, consider the following:

• Electromagnetic interference (EMI)
• Distance limitations for signaling and unshielded conductors

Each AC-powered line card chassis requires 4270 watts (4.27 kW) of AC input power. Two of the four 2000-watt power supplies must be functioning in order to properly power the chassis. The power supplies are 92percent efficient.

Each AC-powered chassis includes a single power shelf consisting of four power supplies. This “two and two” configuration within the single power shelf provides 1+1 redundancy. Each power supply requires one input power connection. The power shelf supports four AC-to-DC power supplies that are FRUs. The AC-to-DC power supplies convert 200 to 240 VAC power to –54 VDC used by the Cisco CRS 4-slot LCC.

The power cables, which are 13 feet (4 m) long, are not shipped preattached to the power shelf. The figure below shows the AC power cord plug. AC power input is 2 wires + protective earthing. The gauge of the earth conductor must be equal to or larger than that of the phase conductor.

Figure 3. AC Power Cord Plug

For additional power system details, see the Cisco CRS Carrier Routing System Line Card Chassis Installation Guide.

The Cisco CRS 4-slot LCC DC power shelf consists of two major components (see the figure below):

• DC power input shelf (Cisco product number: CRS-4-DC-INPUT)
• Power input module (PIM) (Cisco product number: CRS-4-DC-PIM)

When installing the DC power shelf, these two components are mated to create the complete DC power shelf.

The figure below shows the PIM and the DC power input shelf.

Figure 4. DC Power Shelf: DC Power Input Shelf and Power Input Module (PIM)

The Cisco CRS 4-slot LCC DC power system provides 4,000 watts to power the chassis. (To provide power redundancy, up to 8,000 watts are available.) Each DC-powered chassis contains four DC power supplies for 2N redundancy. The PIM provides the input power connections. Note that each power connection has two cables: –48 VDC and return. The PIM, DC power input shelf, and the power supplies are field replaceable.

The Cisco CRS 4-slot LCC requires a total of four dedicated pairs of 60-A DC input power connections, one pair for each of the power supplies, to provide redundant DC power to the Cisco CRS 4-slot LCC midplane.

For full 2N redundancy, we recommend that you have two independent –48 VDC power sources to provide power to the Cisco CRS 4-slot LCC. Connect the two 60-A DC inputs on the left to one wiring block, and the two 60-A DC inputs on the right to the other wiring block.

For more information, see Chapter 2, “Installing and Removing Power Components,” in the Cisco CRS Carrier Routing System Line Card Chassis Installation Guide .

This section offers guidelines for operating your Cisco CRS 4-slot LCC in various environments. Included are airflow, temperature, and humidity recommendations. To assure normal operation and avoid maintenance difficulty, plan and prepare your site before you install the chassis.

The operating environmental site requirements are listed in Cisco CRS 4-Slot Line Card Chassis System Specifications of the Cisco CRS Carrier Routing System 4-Slot Line Card Chassis Site Planning Guide The temperature and humidity ranges listed are those within which the chassis continues to operate. You can maintain normal operation by anticipating and correcting environmental irregularities before they approach critical values.

The environmental monitoring functionality built into the chassis protects the system and components from potential damage from overvoltage and overtemperature conditions.

You must provide the MSC and PLIM interface cables. You also provide the cable management trays for these cables from the Cisco CRS 4-slot LCC to your facility interconnect. Interfaces vary with each system site, plan these data cable runs in advance of the system installation.

The Cisco CRS 4-slot LCC has cable-management features for the front of the chassis. These cable-management features consist of horizontal cable-management trays above the card cage. These trays have a special telescoping feature that allows them to be extended when the chassis is upgraded with higher-density cards. This extension feature also helps in installing the cables in the chassis.

For detailed information about chassis cabling and cable management, see the Cisco CRS Carrier Routing System 4-Slot Line Card Chassis Installation Guide.

The following is a list of tasks you can consider doing to configure the line card chassis for high availability, which helps to ensure that service is not disrupted due to failures:

• Consider installing a redundant line card chassis, whose user interface links mirror the links on the other line card chassis. This way, if something happens to one line card chassis, the links are still operational on the other line card chassis.

To provide more high availability, you can also install each line card chassis in a different room, located in a different fire and power zone. This way, a problem in one room should not affect the operation of the other chassis.

• Consider running the power cables from the power shelf along different routes through the facility or at the installation site.
• Consider running PLIM user interface cables along different routes.