This section describes the warning definition and then lists the core safety warnings for the Cisco VG420 Voice Gateway.

Follow these guidelines to ensure general safety:

• Never attempt to lift an object that might be too heavy for you to lift by yourself.

• Keep the chassis area clear and dust-free during and after installation.

• If you remove the chassis cover, place it in a safe place.

• Keep tools and chassis components away from walk areas.

• Do not wear loose clothing that could get caught in the chassis. Fasten any tie or scarf and roll up sleeves.

• Wear safety glasses when working under conditions that might be hazardous to your eyes.

• Do not perform any action that may create a hazard to people, or which makes the equipment unsafe.

Follow these guidelines when working on the equipment powered by electricity:

• Locate the emergency power-off switch in the room in which you are working. If an electrical accident occurs, you can quickly turn off the power.

• Disconnect all the power source before you install or remove a chassis and before you work near power supplies.

• Look carefully for possible hazards in your work area such as moist floors, ungrounded power extension cables, frayed power cords, and missing safety grounds.

• Do not work alone if hazardous conditions exist.

• Never assume that the power is disconnected from a circuit. Always check.

• Never open the enclosure of the internal power supply.

• If an electrical accident occurs to another person, proceed as follows:

  • Use caution; do not become a victim yourself.

  • Turn off the power supply to the device.

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

  • Determine if the person needs rescue breathing or external cardiac compressions; then take appropriate actions.

In addition, use the following guidelines when working with any equipment that is disconnected from a power source but has telephone wiring or other network cabling connections:

• Never install a telephone wiring during a lightning storm.

• Never install telephone jacks in wet locations unless the jack is specifically designed for it.

• Never touch uninsulated telephone wires or terminals unless the telephone line is disconnected at the network interface.

• Use caution when installing or modifying telephone lines.

• Remove all the power cables from all the installed power supplies before opening the chassis.

This section describes the requirements your site must meet for the safe installation and operation of your router. Ensure that the site is properly prepared before beginning installation. If you are experiencing shutdowns or unusually high errors with your existing equipment, the guidelines provided in this section can also help you isolate the cause of failures and prevent future problems.

Environmental monitoring in the router protects the system and components from damage caused by excessive voltage and temperature conditions. To ensure normal operation and avoid unnecessary maintenance, plan and prepare your site configuration before installation. After installation, ensure the site maintains the required environmental characteristics.

The Cisco VG420 Voice Gateway includes brackets for use with a 19-inch equipment frame rack or, if specified in your order, optional larger brackets for use with a 23-inch equipment frame rack.

The following information can help you plan your equipment rack configuration:

• Allow clearance around the rack for maintenance.

• Enclosed racks must have adequate ventilation. Ensure that the rack is not congested, because each device generates heat. An enclosed rack should have louvered sides and a fan to provide cooling air. Heat generated by equipment at the bottom of the rack can be drawn upward into the intake ports of the equipment above it.

• If you have installed the chassis using slide rails, check for blocked ventilation ports when it is in position in the rack or cabinet. Ensure that the ventilation ports of the Cisco VG420 Voice Gateway are not blocked.

• Baffles can help isolate exhaust air from intake air. Baffles also help draw cooling air through the cabinet. The best location for the baffles depends on the airflow patterns in the rack. You can test the airflow by experimenting with different equipment arrangements.

Warning

Statement 1076— Clearance Around the Ventilation Openings To prevent airflow restriction, allow clearance around the ventilation openings to be at least:1 in (25.4mm).

The location of your hardware and the layout of your equipment rack or wiring room are extremely important considerations for proper operation. Equipment placed too close together, inadequate ventilation, and inaccessible panels can cause malfunctions and shutdowns, and can make maintenance difficult. Plan for access to both front and rear panels of the hardware.

When planning your site layout and equipment locations, refer to the General Site Requirements section. If you are currently experiencing shutdowns or an unusually high number of errors with your existing equipment, these precautions and recommendations may help you to isolate the cause of failure and prevent future problems.

• Ensure that the room where your voice gateway operates has adequate air circulation. Electrical equipment generates heat. Without adequate air circulation, ambient air temperature may not cool equipment to acceptable operating temperatures.

• Always follow the ESD-prevention procedures to avoid damage to equipment. Damage from static discharge can cause immediate or intermittent equipment failure.

• Ensure that the chassis cover and the module rear panels are secure. All empty network module slots, interface card slots, and power supply bays must have filler panels installed. The chassis is designed to allow cooling air to flow within it, through specially designed cooling slots. A chassis with uncovered openings permits air leaks, which may interrupt and reduce the flow of air across internal components.

• Baffles can help isolate exhaust air from intake air. Baffles also help to draw cooling air through the chassis. The best placement of the baffles depends on the airflow patterns in the rack. Find the best placement by experimenting with different configurations.

• If an equipment installed in a rack (particularly in an enclosed rack) fails, try operating the equipment individually. Power off other equipment in the rack (and in the adjacent racks) to allow the hardware maximum cooling air and clean power.

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

To handle power failure conditions, an uninterrupted power supply (UPS) is needed. A separate UPS for Cisco VG420 Voice Gateway is a viable option when the ISR/UPS is not co-located with it.

The Cisco VG420 Voice Gateway supports both AC and DC power supply. For more information on power supply, see Power Supplies chapter in this guide.

For additional information on the power requirements, see the Cisco VG420 Voice Gateway Datasheet.

Warning

Statement 1005— Circuit Breaker This product relies on the building’s installation for short-circuit (overcurrent) protection. To reduce risk of electric shock or fire, ensure that the protective device is rated not greater than 20A.

Warning

Statement 1022—Disconnect Device To reduce the risk of electric shock and fire, a readily accessible disconnect device must be incorporated in the fixed wiring.

Warning

Statement 1033—Safety Extra-Low Voltage (SELV)—IEC 60950/ES1–IEC 62368 DC Power Supply To reduce the risk of electric shock, connect the unit to a DC power source that complies with the SELV requirements in IEC 60950-based safety standards or ES1 and PS1 requirements in IEC 62368-based safety standards or to a Class 2 power supply.

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

• Standard flat-blade screwdriver as required for attaching the brackets for rack mounting.

• Phillips screwdriver for attaching the brackets to the voice gateway.

• Mounting brackets and screws for the 19 or the 23 inches rack, if required.

• Four telco machine screws, for installing the chassis in a rack (use the screw size required by the rack).

• An ESD-preventive wrist strap.

• A modem for remote configuration.

In addition, you might also need the following external equipment:

• A Console terminal or PC with terminal emulation software

• A PC running terminal emulation software for administrative access

• A modem for remote access

• Analog voice RJ-21 and RJ-11 cables

• An ethernet switch

We recommend that you maintain a site log to record all actions relevant to the system. A site log typically includes:

• Installation - Print a copy of the installation checklist and insert it into the site log.

• Upgrades and maintenance - Use the site log to record ongoing maintenance and expansion history. Update the site log to reflect the following:

  • Configuration changes

  • Maintenance schedules, requirements, and procedures performed

  • Comments, notes, and problems

  • Changes and updates to Cisco IOS software