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:

If this unit is the only one in the rack, mount it at the bottom of the rack.
If 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 Four 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 levers or handles on the interface modules. These handles were not designed to support the weight of the chassis.

Warning Make sure that your equipment rack has the proper clearances and airflow to ensure adequate ventilation.

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 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.

Note Consider the equipment and cabling that is already installed in the rack. Ensure that cables from other equipment do 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.

Note Allow at least 3 to 4 ft. (91.4 to 121.9 cm) of clearance behind the rack for maintenance and removal of equipment.

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 room for the shipping crate and pallet.
Choose an installation site that can accommodate the MGX 8260 chassis. If you plan to add additional hardware in the future, leave room for at least one additional rack that accommodates 19-inch or 23-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 chassis.
Verify that you have adequate standard tools. See the "Tools Required" section on page 3-1.

Lifting the Chassis Safely

The chassis is 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 four 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 four people to lift and move it 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.
Always disconnect all external cables before lifting or moving the chassis.

Safety Recommendations

The following guidelines 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 MGX 8260 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 switch all power supplies off and unplug all power cables before opening, installing, or removing a Cisco 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 MGX 8260 hardware in accordance with its marked electrical ratings and product usage instructions to guarantee safe operation.

Safety with Electricity

The circuit cards are designed to be removed and replaced while the 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 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 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 Read the installation instructions before you connect the system to its power source.

Preventing Electrostatic Discharge Damage

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

Although the carrier helps protect the boards, use an antistatic strap whenever handling all cards. 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 circuit cards or cables, make sure 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 circuit boards 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 all circuit cards are fully inserted in their respective chassis slots, that the respective extraction lever is in the locked position, and the captive installation screws are hand tightened. The captive installation screws prevent accidental removal, provide proper grounding for the system, and help to seat the bus connectors in the receptacles.

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

Environmental Requirements

The environmental monitoring functionality in the MGX 8260 Media Gateway protects the equipment from potential damage from overvoltage and overtemperature conditions.

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

Plant Wiring

Following are guidelines for setting up the plant wiring and cabling at your site. When planning the location of the new system, consider the distance limitations for signaling, EMI, and connector compatibility. Each issue and its effect on site planning for Cisco MGX 8260 hardware is described in the sections below.

Caution To comply with FCC requirements, segregate the DC power cables from the signal and I/O cables. Route the signal and I/O cables vertically up the rear of the MGX 8260 chassis and route the DC power cables away from the signal and I/O cables.

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 2 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 MGX 8260 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" on page 2-4.

Note To predict and remedy strong EMI, you might also need to consult experts in radio frequency interference (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 1 ground conductor for each data signal.
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.

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.

Note Cisco recommends that you do not exceed specified transmission rate and distance limits.

When preparing your site for network connections to the MGX 8260 hardware, you should consider a number of factors related to each type of interface :

Type of cabling required for each media 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

Equipment Racks

When planning your rack installation, consider the following guidelines:

Caution To prevent chassis overheating, never install the MGX 8260 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 devices.
Allow easy access to the equipment. The MGX 8260 chassis requires both front and rear access.

Power Considerations

Observe these precautions when planning power connections to your MGX 8260 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.

Temperature, Humidity, and Altitude Guidelines

Planning a proper location for the MGX 8260 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:

Specification	Minimum	Maximum
Temperature, ambient operating (continuous)	5°C	40°C
Temperature, ambient operating (short term)	-5°C	50°C
Temperature, ambient nonoperating and storage	-40°C	70°C
Humidity, ambient (noncondensing) operating	5%	85%
Humidity, ambient (noncondensing) short term operating	5%	90%¹
Altitude, operating only	60 m. below sea level	1800 m.

Table 1-1: General Environment Specifications

Specification Minimum Maximum

Temperature, ambient operating (continuous)

5°C

40°C

Temperature, ambient operating (short term)

-5°C

50°C

Temperature, ambient nonoperating and storage

-40°C

70°C

Humidity, ambient (noncondensing) operating

5%

85%

Humidity, ambient (noncondensing) short term operating

5%

90%¹

Altitude, operating only

60 m. below sea level

1800 m.

¹Not to exceed 0.024 kg of water per kg of dry air

Table of Contents

Preparing the Installation Site