CHAPTER 2 Preparing for Installation This chapter describes the equipment and site requirements for installing the Cisco uBR904 cable modem.
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. 2-2 • 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.
Safety with Electricity 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 install equipment that appears damaged. Never assume that power has been disconnected from a circuit; always check.
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.
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.
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.
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.
Site Requirements 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. 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.
Personal Computer Hardware and Software 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.
Site Requirements Figure 2-1 Cisco uBR904 Cable Modem Footprint and Outer Dimensions Cisco uBR900 SERIES 2.30 in. 13.30 in. 11615 9.50 in. 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.
Preventive Site Configuration: Maintaining Normal Operation Table 2-1 Specifications for Operating and Nonoperating Environments Specification Minimum Maximum Temperature, ambient operating 32°F (0°C) 114°F (40°C) Temperature, ambient nonoperating and storage –13°F (–25°C) 95°F (70°C) Humidity, ambient (noncondensing) operating 5% 95% Humidity, ambient (noncondensing) nonoperating and storage 5% 95% Altitude, operating and nonoperating Sea level 10,000 ft (3,050 m) Vibration, operating
Tools for Installation Power Considerations Follow these precautions and recommendations when planning power connections to the Cisco uBR904 cable modem: • Check the power at your site before installation and during 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.
Making a Crossover Ethernet Cable Connection Making a Crossover Ethernet Cable Connection The RJ-45 receptacle supports standard straight-through and crossover Category 5 UTP (RJ-45) cables. Cisco Systems does not supply Category 5 UTP cables; these cables are available commercially. Figure 2-2 shows the RJ-45 receptacle and plug. Table 2-2 lists the pinouts and signals for the RJ-45 receptacle.
Configuration Information Note Referring to the RJ-45 pinout in Table 2-2, proper common-mode line terminations should be used for the unused Category 5 UTP cable pairs 4/5 and 7/8. Common-mode termination reduces electromagnetic interference (EMI). To identify the RJ-45 cable type, hold the two ends of the cable next to each other so you can see the colored wires inside the ends, as shown in Figure 2-3.
Cisco uBR904 Cable Modem Installation Checklist Note If an error message is displayed on the uBR904, you can find its explanation in the Cisco Cable CPE Error Messages book, viewable online at www.cisco.com/univercd/cc/td/doc/product/cable/cab_modm/ubcmerrs.pdf . Cisco uBR904 Cable Modem Installation Checklist To assist you with your installation and to provide a historical record of what was done and by whom, use the Cisco uBR904 Cable Modem Installation Checklists in Table 2-3 and Table 2-4.
Site Log Task Ethernet cable connected (straight-through for single computer, crossover for hub) Console port set for 9600 baud, 8 data bits, no parity, and 2 stop bits (9600 8N2) System power turned on (power LED is on) System configuration complete (cable and Ethernet LEDs are on) Internet browser running and a test web page can be accessed on the computer Console screen displays correct hardware configuration (displayed after system banner) Verified by Date Site Log A site log provides a historical r
Site Log Table 2-5 Date Site Log Example Description of Action Performed or Symptom Observed Initials Preparing for Installation 2-17
Site Log 2-18 Cisco uBR904 Cable Modem Installation and Configuration Guide
