The following guidelines help ensure your safety and protect the equipment. This list does not include all the potentially hazardous situations. Therefore, you should be on alert.

• Before moving the system, always disconnect all the power cords and interface cables.
• Never assume that power is disconnected from a circuit; always check.
• Before and after installation, keep the chassis area clear and dust free.
• Keep tools and assembly components away from walk areas where you or others could trip over them.
• Do not work alone if potentially hazardous conditions exist.
• Do not perform any action that creates a potential hazard to people or makes the equipment unsafe.
• Do not wear loose clothing that may get caught in the chassis.
• When working under conditions that may be hazardous to your eyes, wear safety glasses.

Be sure to observe the following safety precautions when you work on the router.

Warning

Class 1 laser product. Statement 1008

Warning

Do not stare into the beam or view it directly with optical instruments. Statement 1011

Warning

Invisible laser radiation present. Statement 1016

Warning

Invisible laser radiation may be emitted from disconnected fibers or connectors. Do not stare into beams or view directly with optical instruments. Statement 1051

Warning

Before working on a chassis or working near power supplies, unplug the power cord on AC units; disconnect the power at the circuit breaker on DC units. Statement 12

Warning

Before working on equipment that is connected to power lines, remove jewelry (including rings, necklaces, and watches). Metal objects will heat up when connected to power and ground and can cause serious burns or weld the metal object to the terminals. Statement 43

Warning

Avoid using or servicing any equipment that has outdoor connections during an electrical storm. There may be a risk of electric shock from lightning. Statement 1088

Warning

Before performing any of the following procedures, ensure that power is removed from the DC circuit. Statement 1003

Warning

Read the installation instructions before connecting the system to the power source. Statement 1004

Warning

This product relies on the building’s installation for short-circuit (overcurrent) protection. For a DC installation, ensure that the branch circuit breaker is rated a maximum 15A for DC systems. For AC systems, 15A for voltages greater than 200Vac; 20A for voltages below 127Vac. Statement 1005

Warning

Take care when connecting units to the supply circuit so that wiring is not overloaded. Statement 1018

Warning

The plug-socket combination must be accessible at all times, because it serves as the main disconnecting device. Statement 1019

Warning

To avoid electric shock, do not connect safety extra-low voltage (SELV) circuits to telephone-network voltage (TNV) circuits. LAN ports contain SELV circuits, and WAN ports contain TNV circuits. Some LAN and WAN ports both use RJ45 connectors. Use caution when connecting cables. Statement 1021

Warning

A readily accessible two-poled disconnect device must be incorporated in the fixed wiring. Statement 1022

Warning

To reduce the risk of fire, use only 26 AWG or larger telecommunication line cord. Statement 1023

Warning

This equipment must be grounded. Never defeat the ground conductor or operate the equipment in the absence of a suitably installed ground conductor. Contact the appropriate electrical inspection authority or an electrician if you are uncertain that suitable grounding is available. Statement 1024

Warning

Use copper conductors only. Statement 1025

Warning

This unit might have more than one power supply connection. All connections must be removed to de-energize the unit. Statement 1028

Warning

To prevent personal injury or damage to the chassis, never attempt to lift or tilt the chassis using the handles on modules (such as power supplies, fans, or cards); these types of handles are not designed to support the weight of the unit. Statement 1032

Warning

Connect the unit only to DC power source that complies with the safety extra-low voltage (SELV) requirements in IEC 60950 based safety standards. Statement 1033

Warning

When installing or replacing the unit, the ground connection must always be made first and disconnected last. Statement 1046

Warning

This equipment must be grounded. Never defeat the ground conductor or operate the equipment in the absence of a suitably installed ground conductor. Contact the appropriate electrical inspection authority or an electrician if you are uncertain that suitable grounding is available. Statement 1024

Warning

Installation of the equipment must comply with local and national electrical codes. Statement 1074

Warning

Hazardous voltage or energy may be present on power terminals. Always replace cover when terminals are not in service. Be sure uninsulated conductors are not accessible when cover is in place. Statement 1086

When working on equipment that is powered by electricity, follow these guidelines:

• Locate the room’s emergency power-off switch. If an electrical accident occurs, you know where to quickly turn off the power.

• Before starting work on the system, turn off the DC main circuit breaker and disconnect the power terminal block cable.

• Disconnect all power when:

  • Working on or near power supplies

  • Installing or removing a device chassis or network processor module

  • Performing most hardware upgrades

• Never install equipment that appears damaged.

• Carefully examine your work area for possible hazards, such as moist floors, ungrounded power extension cables, and missing safety grounds.

• Never assume that power is disconnected from a circuit; always check.

• Never perform any action that creates a potential hazard to people or makes the equipment unsafe.

• If an electrical accident occurs and you are uninjured:

  • Use caution to avoid injuring yourself.

  • Turn off power to the device.

  • If possible, send another person to get medical aid. Otherwise, determine the condition of the victim, and then call for help.

  • Determine whether the person needs rescue pulsing or external cardiac compressions; then take appropriate action.

Use the following guidelines when working with any equipment that is disconnected from a power source, but connected to telephone wiring or network cabling:

• When installing or modifying telephone lines, use caution.

• Never install telephone jacks in wet locations unless the jack is designed to handle such locations.

• Never install telephone wiring during a lightning storm.

Check the power at your site to ensure that you are receiving clean power (free of spikes and noise). If necessary, install a power conditioner.

Warning

This equipment needs to be grounded. Use a green and yellow 6 AWG ground wire to connect the host to earth ground during normal use. Statement 383

Electrostatic discharge (ESD) can damage equipment and impair electrical circuitry. ESD may occur when electronic printed circuit cards are improperly handled and can cause complete or intermittent failures. When removing and replacing modules, always follow ESD prevention procedures:

• Ensure that the router chassis is electrically connected to earth ground.
• Wear an ESD-preventive wrist strap, ensuring that it makes good skin contact. To channel unwanted ESD voltages safely to ground, connect the clip to an unpainted surface of the chassis frame. To guard against ESD damage and shocks, the wrist strap and cord must operate effectively.
• If no wrist strap is available, ground yourself by touching a metal part of the chassis.
• When installing a component, use any available ejector levers or captive installation screws to properly seat the bus connectors in the backplane or midplane. These devices prevent accidental removal, provide proper grounding for the system, and help to ensure that bus connectors are properly seated.
• When removing a component, use available ejector levers or captive installation screws, if any, to release the bus connectors from the backplane or midplane.
• Handle components by their handles or edges only; do not touch the printed circuit boards or connectors.
• Place a removed component board side up on an antistatic surface or in a static-shielding container. If you plan to return the component to the factory, immediately place it in a static-shielding container.
• Avoid contact between the printed circuit boards and clothing. The wrist strap only protects components from ESD voltages on the body; ESD voltages on clothing can still cause damage.
• Never attempt to remove the printed circuit board from the metal carrier.

Note	For the safety of your equipment, periodically check the resistance value of the antistatic wrist strap. It should be between 1 and 10 Mohm.

Observe the following general precautions when using and working with your Cisco ASR 920 Router:

• Keep your system components away from radiators and heat sources and do not block cooling vents.
• Do not spill food or liquids on your system components and never operate the product in a wet environment.
• Do not push any objects into the openings of your system components. Doing so can cause fire or electric shock by shorting out interior components.
• Position system cables and power supply cable carefully. Route system cables and the power supply cable and plug so that they are not stepped on or tripped over. Be sure that nothing else rests on your system component cables or power cable.
• Do not modify power cables or plugs. Consult a licensed electrician or your power company for site modifications. Always follow your local and national wiring rules.
• If you turn off your system, wait at least 30 seconds before turning it on again to avoid damage of system components.

Use the following checklist to perform and account for all the site planning tasks described in this chapter:

• The site meets the environmental requirements.
• The site’s air conditioning system can compensate for the heat dissipation of the Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router.
• The floor space that the Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router occupies can support the weight of the system.
• Electrical service to the site complies with the requirements.
• The electrical circuit servicing the Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router complies with the requirements.
• Consideration has been given to the console port wiring and limitations of the cabling involved, according to TIA/EIA-232F.
• The Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router Ethernet cabling distances are within the prescribed limitations.
• The equipment rack in which you plan to install the Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router complies with prescribed requirements.
• When selecting the location of the rack, careful consideration must be given to safety, ease of maintenance, and proper airflow.

The Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router require specific environmental operating conditions. Temperature, humidity, altitude, and vibration can affect the performance and reliability of the router. The following sections provide specific information to help you plan for the proper operating environment.

The Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router are designed to meet the industry EMC, safety, and environmental standards described in the Regulatory Compliance and Safety Information for the Cisco ASR 920 Series Router document.

The Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router have specific power and electrical wiring requirements. Adhering to these requirements ensures reliable operation of the system. Follow these precautions and recommendations when planning your site power for the Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router:

• The redundant power option provides a second, identical power supply to ensure that power to the chassis continues uninterrupted if one power supply fails or input power on one line fails.
• Connect each of the two power supplies to a separate input power source. If you fail to do this, your system might be susceptible to total power failure due to a fault in the external wiring or a tripped circuit breaker.
• To prevent a loss of input power, be sure that the total maximum load on each circuit supplying the power supplies is within the current ratings of the wiring and the breakers.
• Check the power at your site before installation, and periodically after installation to ensure that you are receiving clean power. Install a power conditioner, if necessary.
• Provide proper grounding to avoid personal injury and damage to the equipment due to lightning striking power lines or due to power surges. The chassis ground must be attached to a central office or other interior ground system.

Caution

This product requires short-circuit (overcurrent) protection to be provided as part of the building installation. Install only in accordance with national and local wiring regulations.

Note

The Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router installation must comply with all the applicable codes, and is approved for use with copper conductors only. The ground bond-fastening hardware should be of compatible material and preclude loosening, deterioration, and electrochemical corrosion of hardware and joined material. Attachment of the chassis ground to a central office or other interior ground system must be made with a 6-AWG gauge wire copper ground conductor at a minimum.

For information on power specifications, see Power Supply Specification table.

This section contains guidelines for wiring and cabling at your site. When preparing your site for network connections to the Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router, consider the type of cable required for each component, and the cable limitations. Consider the distance limitations for signaling, electromagnetic interference (EMI), and connector compatibility. Possible cable types are fiber, thick or thin coaxial, foil twisted-pair, or unshielded twisted-pair cabling.

Also consider any additional interface equipment you need, such as transceivers, hubs, switches, modems, channel service units (CSU), or data service units (DSU).

Before you install the Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router, have all the additional external equipment and cables on hand. For information about ordering, contact a Cisco customer service representative.

The extent of your network and the distances between the network interface connections depend, in part, on the following factors:

• Signal type
• Signal speed
• Transmission medium

The distance and rate limits referenced in the following sections are the IEEE-recommended maximum speeds and distances for signaling purposes. Use this information as a guideline when planning your network connections prior to installing the Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router.

If wires exceed the recommended distances, or if wires pass between buildings, give special consideration to the effect of a lightning strike in your vicinity. The electromagnetic pulse caused by lightning or other high-energy phenomena can easily couple enough energy into unshielded conductors to destroy electronic devices. If you have had problems of this sort in the past, you may want to consult experts in electrical surge suppression and shielding.

When wires are run for any significant distance, there is a risk that stray signals will be induced on the wires as interference. If interference signals are strong, they may cause data errors or damage to the equipment.

The sections describe the sources of interference and how to minimize their effects on the Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router system.

The sections provide guidelines for rack-mounting the Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router.

To assist you with your installation and to provide a record of what was done by whom and when, photocopy the Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router Installation Checklist shown in the table below. Use this to record the completion and verification of each procedure. After the checklist is completed, place it in your Site Log along with the other records pertaining to your new Cisco router.

The Site Log provides a record of all the actions related to installing and maintaining the router. Keep it in an accessible place near the chassis so that anyone who performs tasks has access to it.

Create the Site Log prior to the installation. (See Site Log section for more information about the Site Log as well as a sample Site Log that can be used to make copies.)

The chassis is not intended to be moved frequently. Before you install the system, ensure that your site is properly prepared so that you can avoid having to move the chassis later to accommodate power sources and network connections.

Each time you lift the chassis or any heavy object, follow these guidelines:

• Ensure that your footing is solid, and balance the weight of the chassis between your feet.
• Lift the chassis slowly; never move suddenly or twist your body as you lift.
• Keep your back straight and lift with your legs, not your back. If you must bend down to lift the chassis, bend at the knees, not at the waist, to reduce the strain on your back muscles.
• Do not remove installed components from the chassis.
• Always disconnect all external cables before lifting or moving the chassis.

Warning

To prevent personal injury or damage to the chassis, never attempt to lift or tilt the chassis using the handles on modules (such as power supplies, fans, or cards); these types of handles are not designed to support the weight of the unit. Statement 1032

You need the following tools and equipment to install and upgrade the router and its components:

• ESD-preventive cord and wrist strap
• Antistatic mat or antistatic foam
• Number 1 and Number 2 Phillips-head screwdrivers
• #12-24 pan-head screws to secure the router to the equipment rack
• Cables for connecting to the network ports (depending on the configuration)

Note	For more information about cable specifications, see the Troubleshooting section.

• Ethernet hub, switch, or PC with a network interface card for connecting to the Ethernet ports
• Console terminal (an ASCII terminal or a PC running terminal emulation software) that is configured for 9600 baud, 8 data bits, no parity, no flow control, and 1stop bit
• Console cable for connecting to the console port
• Ratcheting torque screwdriver with a Phillips head that exerts up to 30-pound force per square inch (in-lb) or 0.02-kilograms force per square millimeter (kgf/mm2) of pressure
• Crimping tool as specified by the ground lug manufacturer
• Wire-stripping tools for stripping both 6-AWG and 12-AWG wires
• Tape measure and level

Warning

Only trained and qualified personnel should be allowed to install or replace this equipment. Statement 49