Cisco UBR904 User Manual
CHAPTER
2
Preparing for Installation
This chapter describes the equipment and site requirements for installing the Cisco uBR904
cable modem. The chapter contains the following sections:
• Safety Recommendations
• Site Requirements
• Tools for Installation
• Configuration Information
• Cisco uBR904 Cable Modem Installation Checklist
• Site Log
Before installing the Cisco uBR904 cable modem, you should consider the power and
cabling requirements that must be in place at the installation site, the equipment you will
need to install the Cisco uBR904 cable modem, and the environmental conditions the
installation site must meet to maintain normal operation. This chapter guides you through
the process of preparing for the Cisco uBR904 cable modem installation.
Note The Cisco uBR7246 universal broadband router installed at the cable headend must
be properly configured to successfully install the Cisco uBR904 cable modem. Additional
configuration information is downloaded from the Cisco uBR7246 to the Cisco uBR904
cable modem.
W e highly recommend that a cable headend technician be av ailable, or on-call, to assist you
with troubleshooting Cisco uBR904 cable modem installations; especially during the early
field installations. Contact your cable service provider for more information.
Preparing for Installation 2-1
Safety Recommendations
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 uBR904 cable modem should be in compliance with
national and local electrical codes. In the United States, National Fire Protection
Association (NFPA) 70, United States National Electrical Code. In Canada, Canadian
Electrical Code, part I, CC22.1. In other countries, International Electrotechnical
Commission (IEC) 364, part 1 through part 7.
• The cable system must be in accordance with Article 820-40 of the National Electric
Code. This code specifies that the shield of the coaxial cable must be connected to the
grounding system of the building where it is installed, as close to the point of cable entry
as practical.
• Always unplug the power cable before installing or removing a Cisco uBR904 cable
modem.
• Keep the Cisco uBR904 cable modem area clear and dust free during and after
installation.
• Keep tools and Cisco uBR904 cable modem components away from walk areas.
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• Do not wear loose clothing, jewelry (including rings and chains), or other items that
could get caught on the Cisco uBR904 cable modem. Fasten your tie or scarf and roll
up your sleeves.
• The Cisco uBR904 cable modem ships with a three-wire electrical grounding-type plug,
which will only fit into a grounding-type power outlet. This is a safety feature. The
equipment grounding should be in accordance with local and national electrical codes.
• The Cisco uBR904 cable modem operates safely when it is used in accordance with its
marked electrical ratings and product usage instructions.
Cisco uBR904 Cable Modem Installation and Configuration Guide
Safety with Electricity
Follow these basic guidelines when working with any electrical equipment:
• Disconnect all power and external cables before installing or removing a Cisco uBR904
cable modem.
• 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 guidelines that follow when working with any equipment that is
disconnected from a power source, but still connected to cable wiring.
• Never install coaxial wiring during a lightning storm.
• Never install cable jacks in wet locations unless the jack is specifically designed for wet
locations.
Safety with Electricity
• Never touch uninsulated cable wires or terminals unless the line has been disconnected
at the network interface.
• Use caution when installing or modifying cable lines.
Preventing Electrostatic Discharge Damage
Electrostatic discharge (ESD) damage, which occurs when electronic cards or components
are improperly handled, can result in complete or intermittent system failures. The
Cisco uBR904 cable modem consists of a printed circuit board that is housed in a metal
enclosure. Electromagnetic interference (EMI) shielding and connectors are integral
components of the enclosure. Although the enclosure helps protect the boards, use an
antistatic strap (if one is available) whenever handling the Cisco uBR904 cable modem.
Preparing for Installation 2-3
Safety Recommendations
Following are guidelines for preventing ESD damage:
• If you use an ESD wrist strap or ankle strap, ensure that it makes good skin contact and
that the equipment end of the ESD strap is attached to an unfinished surface of the
Cisco uBR904 cable modem.
• Always place the Cisco uBR904 cable modem 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.
Caution For safety, periodically check the resistance value of the antistatic strap. The
measurement should be between 1 and 10 megohm.
FCC Requirements
For Class A Equipment
This equipment has been tested and found to comply with the limits for a Class A digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses, and can radiate radio frequency
energy and, if not installed and used in accordance with the instruction manual, may cause
harmful interference to radio communications. Operation of this equipment in a residential
area is likely to cause harmful interference in which case the user will be required to correct
the interference at his own expense.
For Class B Equipment
This equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This
equipment generates, uses and can radiate radio frequency energy and, if not installed and
used in accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will not occur in a
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Cisco uBR904 Cable Modem Installation and Configuration Guide
particular installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and on, the user
is encouraged to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
Note If the system contains several subsystems/cards then the warning notice has only to
appear in the main control systems user manual/guide.
CISPR 22 Requirements
Specifications covered:
• EN55022:1994 - EU requirements
CISPR 22 Requirements
• AS/NZS 3548:1995 - Australia
Site Requirements
To assure normal operation and avoid unnecessary maintenance, plan your site
configuration and prepare your site before installation. After installation, make sure the site
maintains an ambient temperature of
chassis as free from dust as is practical.
The following sections address the site environment requirements for the Cisco uBR904
cable modem.
23° to 113°F (-5° to 45°C), and keep the area around the
Preparing for Installation 2-5
Site Requirements
AC Power
The AC-input power supply in the Cisco uBR904 cable modem uses a power factor
corrector that allows the Cisco uBR904 cable modem to operate on input voltage and
frequency within the ranges of 100 to 240 VAC and 50/60 Hz.
Refer to Table 1-1 in the chapter “Product Overview” for system power specifications,
including input voltage and operating frequency ranges.
Wiring and Cabling
Following are guidelines for setting up the wiring and cabling at the installation site. When
planning the location of the Cisco uBR904 cable modem, consider the issues of
electromagnetic interference (EMI), coaxial cable quality, and distance limitations for
signaling, as described in the following sections.
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. This fact has two implications for the
construction of plant wiring:
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• 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 receiv ers in the Cisco uBR904 cable modem, and can ev en create
an electrical hazard by conducting power surges through lines and into equipment.
(Review the safety warnings in the section “Safety with Electricity” earlier in this
chapter.)
Note To predict and remedy strong EMI, you might also need to consult experts in radio
frequency interference (RFI).
Cisco uBR904 Cable Modem Installation and Configuration Guide
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