Preparing the Installation Site

Warning To prevent bodily injury when mounting or servicing this unit in a rack, you must take special precautions to ensure that the system remains stable. The following guidelines are provided to ensure your safety:

This unit should be mounted at the bottom of the rack if it is the only unit in the rack.
When mounting this unit in a partially filled rack, load the rack from the bottom to the top with the heaviest component at the bottom of the rack.
If the rack is provided with stabilizing devices, install the stabilizers before mounting or servicing the unit in the rack.

Warning Two people are required to lift the chassis. Grasp the chassis underneath the lower edge and lift with both hands. To prevent injury, keep your back straight and lift with your legs, not your back. To prevent damage to the chassis and components, never attempt to lift the chassis with the handles on the power supplies or on the interface modules. These handles were not designed to support the weight of the chassis.

Warning Make sure that your equipment rack is properly ventilated.

Warning To prevent the system from overheating, do not operate it in an area that exceeds the maximum recommended ambient temperature of 104°F (40°C).

: Note that equipment near the bottom of the rack might generate excessive heat that is drawn upward and into the intake ports of equipment above, leading to overtemperature conditions in the chassis at or near the top of the rack.

Consider the equipment and cabling that is already installed in the rack. Ensure that cables from other equipment will not obstruct the airflow through the chassis or impair access to the power supplies or switching modules. Route cables away from field-replaceable components to avoid disconnecting cables unnecessarily to perform equipment maintenance or upgrades.
Allow at least 3 to 4 ft (91.4 to 121.9 cm) of clearance behind the rack for maintenance and removal of equipment.

2.1.1.1 Unpacking and Moving New Systems

Consider the following issues when preparing to unpack and move your system:

The unpacking and installation process requires the following logistical steps:
- Unloading the unit from the vehicle in which it is shipped
- Using a forklift or similar device to move the unit to an unpacking site
- Moving the unpacked unit to the installation site
Select an unpacking location with adequate surrounding space for the unloading process. You must allow for the shipping crate and pallet.
Choose an installation site that can accommodate your Cisco MGC hardware. If you plan to add additional Cisco MGC hardware in the future, leave room for at least one additional rack that will accommodate 19-inch equipment.
Plan a smooth and unobstructed route from the offloading site to the installation site. The floor that you traverse to the installation site must be able to support a fully loaded cabinet.
Verify that you have adequate standard tools. See the "Tools Required" section.

2.1.1.2 Lifting the Chassis Safely

System chassis are not intended to be moved frequently. Before you install the equipment, ensure that your site is properly prepared. Proper preparation keeps you from having to move the chassis later to accommodate power sources and network connections.

A minimum of two people are required to lift a chassis. Whenever you lift a chassis or any heavy object, follow these guidelines:

Never attempt to lift a chassis by yourself. The size and weight of a chassis requires two people to lift and move safely without causing injury or damaging the equipment.
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 lower back muscles.
Leave all switch field-replaceable units (FRUs) installed (such as switching modules, power supplies, and fan assembly).
Always disconnect all external cables before lifting or moving the chassis.

2.1.2 Mounting Racks to the Floor

Part of preparing your site for Cisco MGC hardware installation is to drill mounting holes that you will use to anchor the rack to the floor. Use the rack bolt-down procedures found in Appendix A:

2.2 Safety Recommendations

The following guidelines will help to ensure your safety and protect the equipment. This list does not cover all potentially hazardous situations, so be alert.

The installation of your Cisco MGC hardware should be in compliance with national and local electrical codes. In the United States, the relevant code is National Fire Protection Association (NFPA) 70, United States National Electrical Code. In Canada, it is Canadian Electrical Code, part I, CC22.1. In other countries, you should observe the standards of the International Electrotechnical Commission (IEC) 364, part 1 through part 7.
Never attempt to lift an object that might be too heavy for 1 person to lift alone.
Always turn OFF all power supplies and unplug all power cables before opening, installing, or removing a Cisco MGC hardware shelf.
Keep the 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 might become trapped in the chassis. Fasten your tie or scarf and roll up your sleeves.
Be sure to use Cisco MGC hardware in accordance with its marked electrical ratings and product usage instructions to guarantee safe operation.

2.2.1 Safety with Electricity

The port adapters and power supplies in the router shelves are designed to be removed and replaced while the Cisco MGC hardware is operating without presenting an electrical hazard or damage.

Follow these basic guidelines when working with any electrical equipment.

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.

Before beginning any procedures requiring access to the chassis interior, locate the emergency power-off switch for the room in which you are working.
Disconnect all power and external cables before installing or removing a chassis.
Do not work alone when potentially hazardous conditions exist.
Never assume that power has been disconnected from a circuit; always check.
Do not perform any action that creates a potential hazard to people or makes the equipment unsafe.
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.

In addition, use the following guidelines when working with any equipment that is disconnected from a power source, but is still connected to telephone wiring or other network cabling.

Never install telephone wiring during a lightning storm.
Never install telephone jacks in wet locations unless the jack is specifically designed for wet locations.
Never touch noninsulated telephone wires or terminals unless the telephone line has been disconnected at the network interface.
Use caution when installing or modifying telephone lines.

Warning

2.2.2 Preventing Electrostatic Discharge Damage

Electrostatic discharge (ESD) damage occurs when electronic cards or components are improperly handled, which can result in complete or intermittent system failures.

Although the carrier helps protect the boards, use an antistatic strap whenever handling the network processing engine, I/O controller, and port adapters. Handle the carriers by the handles and the carrier edges only; never touch the boards or connector pins.

Following are guidelines for preventing ESD damage:

Always use an ESD wrist strap or ankle strap and ensure that it makes good skin contact.
When handling a removed network processing engine, I/O controller, or port adapter, make sure that the equipment end of your ESD strap is attached to an unfinished chassis surface of the device in which it is housed. Do not touch the printed circuit board, and avoid contact between the printed circuit board and your clothing.
Always place the network processing engine, I/O controller, or port adapter component side up on an antistatic surface or in a static shielding bag. If you are returning the item to the factory, immediately place it in a static shielding bag.
Ensure that the I/O controller and network processing engine are fully inserted in their respective chassis slots and that their captive installation screws are tightened. The captive installation screws prevent accidental removal, provide proper grounding for the system, and help to seat the bus connectors in the midplane.
Verify that each port adapter is fully inserted in its chassis slot and that the respective port adapter lever is in the locked position.

Caution For safety, periodically check the resistance value of the antistatic strap. The measurement should be between 1 and 10 megohm (Mohm).

2.3 Environmental Requirements

The environmental monitoring functionality in the Cisco MGC hardware protects the equipment from potential damage from overvoltage and overtemperature conditions. After installation, make sure that the site maintains a normal ambient temperature of 32 to 104ºF (0 to 40ºC). The operating ambient can reach 122ºF (50ºC) for a maximum of 96 consecutive hours and a total of not more than 15 days in 1 year. Keep the area around the chassis as free from dust as is practical.

The following sections address the site environment requirements for the Cisco MGC hardware.

Note To assure normal operation and avoid unnecessary maintenance, plan your site configuration and prepare your site before installation.

2.3.1 Plant Wiring

Following are guidelines for setting up the plant wiring and cabling at your site. When planning the location of the new syst em, consider the distance limitations for signaling, EMI, and connector compatibility. Each issue and its effect on Cisco MGC hardware site planning is described in the sections below.

2.3.1.1 Interference Considerations

When wires are run for any significant distance in an electromagnetic field, interference can occur between the field and the signals on the wires. The potential presence of interference has two implications for the construction of plant wiring:

Bad wiring practice can result in radio interference emanating from the plant wiring.
Strong EMI, especially when it is caused by lightning or radio transmitters, can destroy the signal drivers and receivers in the Cisco MGC hardware. EMI can even create an electrical hazard by conducting power surges through lines and into equipment. For more information on the effects of EMI, review the safety warnings in the section "Preventing Electrostatic Discharge Damage".

Note

rence (RFI).

Follow these guidelines to reduce the possibility of extraneous interference and damage from EMI pulses:

Use twisted-pair cable in your plant wiring with a good distribution of grounding conductors to reduce or eliminate the chance of radio interference. If you must exceed the recommended wiring distances, use a high-quality twisted-pair cable with one ground conductor for each data signal.

If wires exceed recommended distances or 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 might want to consult experts in electrical surge suppression and shielding.

2.3.1.2 Distance Limitations and Interface Specifications

The size of your networks and the distances between connections depend on the type of signal, the signal speed, and the transmission media (the type of cabling used to transmit signals). For example, standard coaxial cable has a greater channel capacity than twisted-pair cabling and can transmit signals more clearly for a greater distance.

The distance and rate limits in the following descriptions are the IEEE (Institute of Electrical and Electronics Engineers) recommended maximum speeds and distances for signaling.

Note Cisco recommends that you do not exceed specified transmission rate and distance limits. However, if you understand the electrical problems that might arise and can compensate for them, you can obtain good results with rates and distances greater than those shown here. For example, the recommended maximum rate for V.35 is 2 Mbps. Still, it is commonly used at 4 Mbps without any problems. Be advised that you exceed the recommended limits at your own risk.

When preparing your site for network connections to the Cisco MGC hardware, you should consider a number of factors related to each type of interface:

Type of cabling required for each type (fiber, thick or thin coaxial, shielded twisted-pair [STP], or unshielded twisted-pair [UTP] cabling)

Distance limitations for each signal type

Specific cables you need to connect each interface

Any additional interface equipment you need, such as transceivers, hubs, switches, modems, channel service units (CSUs), or data service units (DSUs)

Cable pinouts if you intended to build your own cables (see "Cabling and Connections" for more information.

For ordering information for any additional special equipment that you might require, contact a Cisco customer service representative. Keep in mind, however, that the Cisco MGC hardware is preconfigured in the configuration that you ordered. All devices, cables, documentation, and miscellaneous parts should be included with the system.

2.3.1.3 Equipment Racks

When planning your rack installation, consider the following guidelines:

Caution To prevent chassis overheating, never install the Cisco MGC hardware in a room that is not properly ventilated or air conditioned.

Always install new equipment as low as possible in the rack to maintain a low center of gravity and prevent the rack from falling over.
Be careful not to loosen cable connections when installing or removing a device.
Allow easy access to the equipment:
- Sun Netra t 1120 and Sun Netra t 1125 field-replaceable units (FRUs) are accessible from the top of the units
- Sun E450 FRUs are accessible from the side of the unit
- A/B Switch FRUs are accessible from the rear of the unit

In addition to the preceding guidelines, review the precautions for avoiding overtemperature conditions in the following section, "Site Environment Specifications."

2.3.1.4 Site E nvironment Specifications

Table 2-1 lists operating and nonoperating environmental site requirements. However, a measurement that is approaching the minimum or maximum of a range indicates a potential problem. You can maintain normal operation by anticipating and correcting environmental anomalies before they approach a maximum operating range. For additional equipment specifications, see the "Cisco MGC Product Components" section of "Cisco Media Gateway Controller Product Introduction."

Table 2-1: General Environment Specifications

Specification Minimum Maximum

Temperature, ambient operating (continuous)

32ºF (0ºC)

104ºF (40ºC)

Temperature, ambient operating (short term)

23ºF (-5ºC)

122ºF (50ºC)

Temperature, ambient nonoperating and storage

-4ºF (-20ºC)

149ºF (65ºC)

Humidity, ambient (noncondensing) operating

10%

90%

Humidity, ambient (noncondensing) nonoperating and storage

5%

95%

Altitude, operating and nonoperating

Sea level (0 ft [0 m])

10,000 ft (3050 m)

Specification	Minimum	Maximum
Temperature, ambient operating (continuous)	32ºF (0ºC)	104ºF (40ºC)
Temperature, ambient operating (short term)	23ºF (-5ºC)	122ºF (50ºC)
Temperature, ambient nonoperating and storage	-4ºF (-20ºC)	149ºF (65ºC)
Humidity, ambient (noncondensing) operating	10%	90%
Humidity, ambient (noncondensing) nonoperating and storage	5%	95%
Altitude, operating and nonoperating	Sea level (0 ft [0 m])	10,000 ft (3050 m)

2.3.2 Preventiv e Site Configuration---Maintaining Normal Operation

Planning a proper location for the Cisco MGC hardware and the layout of your equipment rack or wiring closet are essential for successful operation. Equipment placed too close together or inadequately ventilated can cause system overtemperature conditions. In addition, chassis panels made inaccessible by poor equipment placement can make system maintenance difficult.

Following are precautions that can help avoid problems during installation and ongoing operation.

2.3.2.1 General Precautions

Follow these general precautions when planning your equipment locations and connections:

Router Shelves only---The environmental monitor continually checks the interior chassis environment; it provides warnings for high temperature and maximum and minimum voltages and creates reports on any occurrences. Use the show environment command regularly to check the internal system status on the router shelves. If warning messages are displayed, take immediate action to identify the cause and correct the problem.
Keep the Cisco MGC hardware out of any area that tends to collect dust.
Follow ESD prevention procedures to avoid damage to equipment. Damage from static discharge can cause immediate or intermittent equipment failure.

2.3.2.2 Power Considerations

Observe these precautions when planning power connections to your Cisco MGC hardware:

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.
Install proper grounding to avoid damage from lightning and power surges.

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Preparing the Installation Site