Table Of Contents
Preparing for Installation
Safety Guidelines
Electrical Equipment Guidelines
Chassis Lifting Guidelines
Site Requirement Guidelines
Rack-Mounting Guidelines
Temperature and Humidity Requirements
Power Connection Guidelines
Plant Wiring Guidelines
Shipping Container Contents
Tools and Parts Required
Preparing for Installation
This chapter describes the tasks you must perform before beginning to install a Cisco uMG9820. The chapter includes the following major sections:
•
Safety Guidelines
• Site Requirement Guidelines
• Shipping Container Contents
• Tools and Parts Required
Warning Only trained and qualified personnel should be allowed to install, replace, or service this equipment. Statement 1030
Warning Read the installation instructions before connecting the system to the power source. Statement 1004
Safety Guidelines
Any device that uses electricity must be handled carefully; follow these guidelines to ensure general safety:
•Keep the chassis area clear and dust-free during and after installation.
•Keep tools 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 your tie or scarf and roll up your sleeves.
•Wear safety glasses if you are working under any conditions that might be hazardous to your eyes.
•Do not perform any action that creates a potential hazard to people or makes the equipment unsafe.
•Never attempt to lift an object that might be too heavy for you to lift by yourself.
•Make sure that all faceplates and cover panels are in place.
Warning Blank faceplates and cover panels serve three important functions: they prevent exposure to hazardous voltages and currents inside the chassis; they contain electromagnetic interference (EMI) that might disrupt other equipment; and they direct the flow of cooling air through the chassis. Do not operate the system unless all cards, faceplates, front covers, and rear covers are in place. Statement 1029
•Use caution when installing or modifying network cables.
•Always unplug the power cable before installing or removing a chassis.
•The AC-powered Cisco uMG9820 ships with a three-wire electrical grounding-type plug, which only fits into a grounding-type power outlet. This is a safety feature. The equipment should be grounded in accordance with local and national electrical codes.
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
•Install the Cisco uMG9820 in compliance with national and local codes: in the United States, National Fire Protection Association (NFPA) 70, United States National Electrical Code; in Canada, Canadian Electrical Code, part I, C22.1.
Electrical Equipment Guidelines
Warning Do not work on the system or connect or disconnect cables during periods of lightning activity. Statement 1001
Follow these guidelines when you work on equipment powered by electricity:
Warning The plug-socket combination must be accessible at all times, because it serves as the main disconnecting device. Statement 1019
•Locate the emergency power-off switch for the room in which you are working. Then, if an electrical accident occurs, you can act quickly to turn off the power.
•Disconnect all power before installing or removing a chassis.
•Do not work alone if potentially hazardous conditions exist.
•Never assume that power is disconnected from a circuit. Always check.
•Look carefully for possible hazards in your work area, such as moist floors, ungrounded power extension cables, frayed power cords, and missing safety grounds.
•A battery is soldered onto the processor card. Do not attempt to replace the battery. Handle the card carefully, and ensure the proper disposal of the card and battery should that be necessary.
Warning Ultimate disposal of this product should be handled according to all national laws and regulations. Statement 1040
•If an electrical accident occurs, proceed as follows:
–Use caution; do not become a victim yourself.
–Turn off power to the system.
–If possible, send another person to get medical aid. Otherwise, assess the condition of the victim and then call for help.
–Determine whether the person needs rescue breathing or external cardiac compressions; then take appropriate action.
Warning Class 1 laser product. Statement 1008
Chassis Lifting Guidelines
A fully configured Cisco uMG9820 weighs approximately 17.5 pounds (7.9 kg). The chassis is not intended to be moved frequently. Before you install the Cisco uMG9820, ensure that your site is properly prepared so you can avoid having to move the chassis later to accommodate power sources and network connections.
Whenever you lift the chassis or any heavy object, follow these guidelines:
•Always disconnect all external cables before lifting or moving the chassis.
•Ensure that your footing is solid, and balance the weight of the object 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.
•Lift the chassis from the bottom; grasp the underside of the chassis exterior with both hands.
Site Requirement Guidelines
Warning This unit is intended for installation in restricted access areas. A restricted access area can be accessed only through the use of a special tool, lock and key, or other means of security. Statement 1017
Warning To prevent the system from overheating, do not operate it in an area that exceeds the maximum recommended ambient temperature of: 32 to 104°F (0 to 40°C) Statement 1047
The environmental monitoring functions of the Cisco uMG9820 protect the system and components from potential damage from overvoltage and overtemperature conditions. To ensure normal operation and avoid unnecessary maintenance, plan your site configuration and prepare your site before installation. After installation, make sure that the site maintains an ambient temperature of 32 to 104°F
(0 to 40°C), and keep the area around the chassis as free from dust as is practical.
Planning a proper location for the Cisco uMG9820 and the layout of your equipment rack or wiring closet is essential for successful system 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. The following precautions can help prevent problems during installation and ongoing operation:
•Keep the Cisco uMG9820 off the floor and out of any area that tends to collect dust.
•Ensure that the room where the chassis operates has adequate ventilation. Remember that electrical equipment generates heat. Ambient air temperature may not cool equipment to acceptable operating temperatures without adequate ventilation.
•Plan for access to both front and rear panels of the chassis.
•Use the show env all command regularly to check the internal system status (operating temperature, operating voltages, and so on). If warning messages are displayed, take immediate action to identify the cause and correct the problem.
•Follow ESD prevention procedures to avoid damage to equipment. Damage from static discharge can cause immediate or intermittent equipment failure.
Rack-Mounting Guidelines
The Cisco uMG9820 can be mounted in two ways:
•In a standard 19-inch rack
•In a four-post rack having a depth of 23 to 25 inches.
For the first option, simply use the front rack-mount brackets integrated into the front of the unit. For the second option, use the rear rack-mount kit included with the unit, to secure the back of the chassis to the rack.
As an alternative, you can mount the chassis on an equipment shelf—provided that the rack dimensions allow you to secure the Cisco uMG9820 to the shelf, and the overall configuration permits safe installation and access. However, we recommend rack-mounting the Cisco uMG9820.
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. Statement 1006
When rack-mounting the Cisco uMG9820, consider the following guidelines:
•When mounting the chassis between two posts or rails, the inner clearance (the width between the inner sides of the two posts or rails) must be at least 17.70 inches (45.0 cm).
•The height of the chassis is 1.72 inches (4.37 cm).
•It is necessary to secure only the front of the chassis to a 19-inch rack. When mounting the chassis in a four-post rack that is between 23 and 25 inches deep, use the supplied rear rack-mount kit to secure the back of the chassis to the rack.
•If you plan to use an equipment shelf, ensure that the shelf is constructed to support the weight and accommodate the dimensions of the chassis.
When planning your rack installation, consider the following guidelines:
•Install the QAM gateway in an open rack whenever possible. If installation in an enclosed rack is unavoidable, ensure that the rack has adequate ventilation.
Caution To prevent chassis overheating, never install the chassis in an enclosed rack or room that is not properly ventilated or air conditioned. An enclosed rack should have louvered sides and a fan to provide cooling air, because heat generated by equipment near the bottom of the rack can be drawn upward into the intake ports of the equipment above.
•Ensure that the rack is not congested, because each unit in the rack generates heat. To allow for adequate airflow, maintain a minimum clearance of 3 inches (7.6 cm) in front of and behind the chassis, for the cooling air inlet and exhaust ports, respectively.
Caution Do not place the chassis where heated exhaust air from other systems could enter the air intake at the front of the chassis. This could cause the system to overheat.
•Baffles can isolate exhaust air from intake air, which also helps to draw cooling air through the chassis. The best placement of the baffles depends on the airflow patterns in the rack, which can be found by experimenting with different configurations.
•When equipment installed in a rack (particularly in an enclosed rack) fails, try operating the equipment by itself, if possible. Power off other equipment in the rack to allow the unit under test a maximum of cooling air and clean power.
•Allow sufficient clearance around the rack for maintenance. If the rack is mobile, you can push it back near a wall or cabinet for normal operation and pull it out for maintenance, such as installing or replacing a QAM card, or connecting cables. If the rack is stationary, allow 3 to 4 feet (0.9 to 1.2 m) of clearance in front of and behind the chassis.
•Install the chassis, and external devices to which it will connect, in a contiguous stack.
•To maintain a low center of gravity and prevent the rack from falling over, always install heavier equipment in the lower half of a rack.
•If you use telco-type racks, be sure that the rack is bolted to the floor and secured, because in these types of installations only the front of the chassis mounts to the two rack posts. Ensure that the weight of the chassis does not make the rack unstable.
Temperature and Humidity Requirements
Table 1-2 lists operating and nonoperating environmental site requirements. The ranges listed are those within which the Cisco uMG9820 continues to operate; however, a measurement 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 minimum or maximum operating threshold.
Power Connection Guidelines
Follow these precautions and recommendations when planning power connections to a Cisco uMG9820:
•Make sure that the plug-socket combination is accessible.
Warning The plug-socket combination must be accessible at all times, because it serves as the main disconnecting device. Statement 1019
•To ensure that you are receiving clean power, install a power conditioner if necessary.
Warning Take care when connecting units to the supply circuit so that wiring is not overloaded. Statement 1018
•To avoid damage from lightning and power surges, use a grounded AC power outlet and install proper grounding.
•To prevent thermal buildup, keep the Cisco uMG9820 off the floor and out of any area that tends to collect dust.
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
•The AC-input power supply operates on input voltage and frequency within the ranges of 100 to 240 VAC and 50-60 Hz without the need for operator adjustments. This power supply also incorporates an active power-factor corrector that minimizes the unwanted generation of line current harmonics, which can cause overloading of site electrical distribution systems.
Plant Wiring Guidelines
The 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, as described in the following sections:
• Interference Considerations
• Distance Limitations and Interface Specifications
Interference Considerations
When wires extend for any significant distance in an electromagnetic field, interference can occur between the field and the signals on the wires. This has two implications for the construction of plant wiring:
•Bad wiring can result in radio interference emanating from the plant wiring.
•Strong electromagnetic interference (EMI), especially when it is caused by lightning or radio transmitters, can destroy the signal drivers and receivers in the Cisco uMG9820, and can even create an electrical hazard by conducting power surges through lines and into equipment. (Review the safety warnings in the Electrical Equipment Guidelines.)
Note To predict and remedy strong EMI, you may also need to consult experts.
If you use twisted-pair cable in your plant wiring with a good distribution of grounding conductors, the plant wiring is unlikely to emit radio interference. If you exceed the recommended distances, use a high-quality twisted-pair cable with one ground conductor for each data signal.
If wires exceed 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.
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 the signals).
Note We recommend that you do not exceed specified transmission rate and distance limits.
When preparing your site for network connections to a Cisco uMG9820, you must consider a number of factors related to each type of interface:
•The type of cabling required for each type (fiber, thick or thin coaxial, foil-twisted pair [FTP], or unshielded twisted-pair [UTP] cabling)
•Distance limitations for each signal type
•The specific cables you need to connect each interface
•Any additional interface equipment you need
•Cable pinouts if you plan to build your cables
Note The specific interface information you need is contained in the documentation that is shipped with each field-replaceable unit.
Shipping Container Contents
To ensure its safety during shipping and handling, the Cisco uMG9820 comes in a specially designed shipping container.
Caution To avoid damaging the Cisco uMG9820, unpack the container carefully.
The shipping container includes the following items:
•One Cisco uMG9820 QAM gateway with two to six QAM cards installed. The number of QAM cards installed depends upon the configuration ordered.
•One accessory kit (System D —74-3343-01 Accessory Kit), to include the following:
–One left-rear (with respect to the front) rack extension (labeled Part #1)
–One right-rear rack extension (labeled Part #2)
–Two rear rack-mount brackets (labeled Part #3)
–Four 6-32 x 1/4-inch pan-head Phillips screws
–Four 6-32 x 1/4-inch flat-head Phillips screws
–Eight 10-32 x 5/8-inch oval-head Phillips screws
–Eight black-plastic cup washers
–One RF-monitor port-adapter cable (MCX to F-connector female, for use with optional RF test equipment)
–RJ-45 to RJ-45 rollover cable
–RJ-45 to DB-9 female DTE adapter (labeled TERMINAL)
–One 7/64-inch hex key (required to remove the hex-head retaining screw on the power supply module, if removal is necessary)
–Electrostatic discharge (ESD)-preventive wrist strap
•Documentation Set:
–Quick Start Guide—Rack-Mounting the Cisco uMG9820 uMG9820 QAM Gateway
–Cisco uMG9820 QAM Gateway Regulatory Compliance and Safety Information
Keep the shipping container in case you must return the Cisco uMG9820 to the factory.
Tools and Parts Required
The Cisco uMG9820 is fully assembled at the factory; no additional assembly is required prior to installing the unit. In addition to the accessory kit that is provided, the following items are recommended:
•Number 2 Phillips screwdriver
•Torque wrench (to ensure that F-connectors on RF ports are tightened to 15 inch-pounds)
