Cisco UBR904 Manual de usuario

CHAPTER

Preparing for Installation 2-1

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.

We highly recommend that a cable headend technician be available, 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.

Safety Recommendations

Cisco uBR904 Cable Modem Installation and Configuration Guide

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 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.

•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.

•TheCiscouBR904cablemodemshipswithathree-wireelectricalgrounding-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.

Preparing for Installation 2-3

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.

•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.

Safety Recommendations

Cisco uBR904 Cable Modem Installation and Configuration Guide

2-4

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.

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

Caution For safety, periodically check the resistance value of the antistatic strap. The

measurement should be between 1 and 10 megohm.

Preparing for Installation 2-5

CISPR 22 Requirements

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

•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 23° to 113°F (-5° to 45°C), and keep the area around the

chassis as free from dust as is practical.

The following sections address the site environment requirements for the Cisco uBR904

cable modem.

Site Requirements

Cisco uBR904 Cable Modem Installation and Configuration Guide

2-6

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

Whenwiresare run for any significantdistance 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:

•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 uBR904 cable modem, and can even 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).

Preparing for Installation 2-7

Wiring and Cabling

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 might want to consult experts in electrical surge suppression and shielding.

Coaxial Cable Quality

CATV coaxial cable quality can vary dramatically at each installation site. Poor insulation,

improperly installed additional outlets, the condition and length of the cable’s center

conductor, and the quality of the cable can negatively affect the connectivity and

performanceof the Cisco uBR904 cable modem for digitaldatatransmission. Coaxial cable

tolerances for the transmission of two-way digital data are much lower than the tolerances

for the transmission of downstream-only video. Coaxial cable used to carry two-way digital

data must be of very high quality.

Note A 5 dB reduction in signal quality for analog downstream video might cause a slight

degradation of picture clarity, which might or might not be noticeable to a subscriber.

A small reduction in signal quality for digital data might completely disrupt service to a

Cisco uBR904 cable modem user.

Check the cables for general quality level, tears or cuts in the insulation, insulation that is

at least 80% braid with foil, a broken or bent center conductor at the conductor ends, the

length of the center conductor, and splitters or amplifiers that have been added to extend

video connectivity at the installation site.

Note The center conductor should extend 1/8 in. (3.2 mm) beyond the end of the

conductor.

Site Requirements

Cisco uBR904 Cable Modem Installation and Configuration Guide

2-8

We recommend that you replace any cable that is in question to begin the installation with

clean, two-way digital data transmission media. If the cable is of high-quality and was

recently installed, replacing the connectors with high-quality connectors can also improve

performance.

Distance Limitations

The size of your networks and the distances between connections on the CATV network

can affect the successful installation of a Cisco uBR904 cable modem.

When preparing a site for network connections to the Cisco uBR904 cable modem, you

must consider several factors related to the cabling:

•The number of amplifiers from the installation site to the nearest node

•The number of outlets and amplifiers at the installation site

•Cable pinouts if you plan to build your cables

Potential distance limitation problems in the CATV network can be reduced by ensuring the

following factors:

•A correct, linear unity gain two-way sweep procedure is in place

•Industry-standard configuration practices are used at the headend

•The downstream frequency is known at the time of installation

•The absolute downstream signal level can be measured where it enters the

Cisco uBR904 cable modem

Caution If you replace a connector, be careful not to score the center conductor. A

scored conductor can reduce or impair performance for channels broadcast between 550

and 860 MHz.

Preparing for Installation 2-9

Personal Computer Hardware and Software

The Cisco uBR904 cable modem must be connected to a personal computer at the

installation site. We recommend a personal computer with the following configuration:

•A Pentium or 486 processor-based personal computer running the Windows 95

operating system.

•Ethernet 10BaseT network interface card and applicable drivers installed in the

computer.

•Web browsing software, such as Microsoft Internet Explorer or Netscape Navigator

installed in the computer.

•Internet Protocol (IP) set as the networking protocol; as opposed to Point-to-Point

Protocol (PPP), which is commonly used in dial-up Internet connection. See the user

guides that accompanied your computer and your network interface card for more

information on how to set this option.

•Network settings configured to enable DHCP service for dynamic IP address

assignment; as opposed to manual IP address assignment. See the user guides that

accompanied your computer and your network interface card for more information on

how to set this option.

Installing the Cisco uBR904 Cable Modem at the Headend

You can mount the Cisco uBR904 cable modem on an equipment shelf at the headend

provided that the rack dimensions allow you to secure the router to the shelf, and the overall

configuration permits safe installation and access.

Note We recommend that you install at least one cable modem at each headend site to

assist field troubleshooting and to detect potential problems at subscriber installation sites.

Figure 2-1 shows the Cisco uBR904 cable modem footprint and outer dimensions.

Site Requirements

Cisco uBR904 Cable Modem Installation and Configuration Guide

2-10

Figure 2-1 Cisco uBR904 Cable Modem Footprint and Outer Dimensions

Site Environment

Table 2-1 lists the operating and nonoperating environmental site requirements. The

following ranges are those within which the Cisco uBR904 cable modem will continue to

operate; 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.

•Operating temperature range: 32° though 114°F (0° through 40°C).

•Operating humidity range: 5 to 95%, noncondensing.

•Airflow: Keep the back, sides, and bottom of the Cisco uBR904 cable modem clear of

obstructions and away from the exhaust of other equipment.

Caution To prevent chassis overheating, never install the Cisco uBR904 cable modem

in an enclosed rack or room that is not properly ventilated or air conditioned.

11615

2.30 i

9.50 in.

Cisco uBR900

SERIES

13.30 in.

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