Cisco UBR904 Manuale di istruzioni

CHAPTER

Installing the Cisco uBR904 Cable Modem 3-1

Installing the Cisco uBR904

Cable Modem

This chapter explains the procedures for installing and starting the Cisco uBR904 cable

modem. The chapter contains the following sections:

•Connecting the CATV Coaxial Cable

•Connecting Ethernet Cables to the Cisco uBR904 Cable Modem

•Connecting the Cisco uBR904 Cable Modem to the Computer

•Connecting Console Cables

•Connecting Power

•Starting the Cisco uBR904 Cable Modem

The most common installation location for a Cisco uBR904 cable modem is on a desktop

next to a personal computer. You can also install a Cisco uBR904 cable modem on a shelf

in an equipment rack, for example, if you are installing a Cisco uBR904 cable modem at a

headend site for test purposes.

Connecting the CATV Coaxial Cable

Cisco uBR904 Cable Modem Installation and Configuration Guide

3-2

Connecting the CATV Coaxial Cable

Follow these steps to connect the CATV coaxial cable to the Cisco uBR904 cable modem:

Step 1 Locate the coaxial cable at the installation site and move the cable end, or install

a two-way splitter as necessary, to provide a connection near the Cisco uBR904

cable modem location.

Note If the quality or general condition of the coaxial cable at the installation

site is in question, we recommend that you replace the coaxial cable. For more

information on the effects of substandard cabling on the Cisco uBR904 cable

modem installation, see the section “Wiring and Cabling” in the chapter

“Preparing for Installation.”

Step 2 Connect the CATV coaxial cable end to the F connector on the back of the

Cisco uBR904 cable modem. This connector is labeled “Cable TV In.”

(See Figure 3-1.)

Figure 3-1 Connecting the CATV Coaxial Cable to the Cisco uBR904 Cable

Modem

This completes the procedure for connecting the CATV coaxial cable to the Cisco uBR904

cable modem.

To cable source

11616

F connector (Cable TV In)

Installing the Cisco uBR904 Cable Modem 3-3

Connecting Ethernet Cables to the Cisco uBR904 Cable Modem

Connecting Ethernet Cables to the Cisco uBR904 Cable

Modem Follow these steps to connect the Ethernet cables to the Cisco uBR904 cable modem at the

installation site:

Step 1 Locate the straight-through yellow Ethernet cable that was included with your

Cisco uBR904 cable modem. Note that only one cable is included. For

additional cables, see your commercial vendor. (See Figure 3-2.)

Note If you are connecting the Cisco uBR904 cable modem directly to a single

computer, use the straight-through Ethernet cable that was included with the

Cisco uBR904 cable modem.

If you are connecting the Cisco uBR904 cable modem to a hub for multiple

computer connections, you must use a crossover Ethernet cable. A crossover

Ethernet cable is not provided with the Cisco uBR904 cable modem; however,

Ethernet cables are widely available from other commercial vendors. For details

on making a crossover connection, see the section, “Making a Crossover

Ethernet Cable Connection” in the chapter, “Preparing for Installation,” for

details. If your hub has an uplink port, you might be able to use a

straight-through cable to connect the hub directly to your computer.

Figure 3-2 Ethernet Cable and RJ-45 Connectors

H2936

87654321

J-45 connector

Connecting Ethernet Cables to the Cisco uBR904 Cable Modem

Cisco uBR904 Cable Modem Installation and Configuration Guide

3-4

Step 2 Connect one end of the Ethernet cable to one of the Ethernet ports (labeled 1X,

2X, 3X, or 4X) on the rear panel of the Cisco uBR904 cable modem. Press the

cable end firmly into the receptacle. When properly connected, the Ethernet

cable will be locked into the receptacle and can only be removed by pressing the

plastic tab located on the connector while pulling the cable back from the

receptacle. (See Figure 3-3.)

Figure 3-3 Connecting the Ethernet Cable to the Cisco uBR904 Cable Modem

Step 3 Repeat Step 2 for other Ethernet connections.

This completes the procedure for connecting Ethernet cables to the Cisco uBR904 cable

modem.

11617

o cable

source

Ethernet 10BaseT

(RJ-45)

To computer

Ethernet cable

Installing the Cisco uBR904 Cable Modem 3-5

Connecting the Cisco uBR904 Cable Modem to the Computer

Connecting the Cisco uBR904 Cable Modem to the

Computer

Follow these steps to connect the Cisco uBR904 cable modem to the computer at the

installation site:

Step 1 Locate the unconnected end of the yellow Ethernet cable that you just connected

to the Cisco uBR904 cable modem in the previous section, “Connecting

Ethernet Cables to the Cisco uBR904 Cable Modem,” and connect this end to

the Ethernet port on the personal computer. (See Figure 3-4.)

Note The Ethernet port is located on the back of the computer if an internal

Ethernet card is installed. On a laptop computer, the Ethernet port is usually

located on an adapter cable connected to a PCMCIA card installed in the

computer’s PCMCIA slot.

If you need additional information to locate the Ethernet port on the computer,

consult the user documentation for the computer.

Figure 3-4 Connecting the Cisco uBR904 Cable Modem to the Computer

Step 2 Repeat Step 1 for other cable modem and personal computer connections.

This completes the procedure for connecting the Cisco uBR904 cable modem to a

computer.

To cable

source

10BaseT

11618

Connecting Console Cables

Cisco uBR904 Cable Modem Installation and Configuration Guide

3-6

Connecting Console Cables

The console port for the Cisco uBR904 cable modem is located on the back of the unit. This

section contains connection equipment and pinout information for the console port on the

Cisco uBR904 cable modem.

Note The console port is provided on the Cisco uBR904 cable modem to aid in

troubleshooting. Most troubleshooting can be completed without using the console port.

We recommend that you only use the console port if all other troubleshooting steps fail to

pinpoint a failure.

If you do not plan to use the console port, proceed to the section “Connecting Power,” later

in this chapter.

Console Port Connection Equipment

The console port is configured as data communications equipment (DCE). There is one

console port on the back of the Cisco uBR904 cable modem; it uses an RJ-45 connector.

RJ-45-to-DB-25 adapters are available for connection to modems and other external

communications equipment.

Note The console port is an asynchronous serial port; any devices connected to this port

must be capable of asynchronous transmission. (Asynchronous is the most common type

of serial device.)

Before connecting a hand-held terminal to the console port, configure the terminal to match

the Cisco uBR904 cable modem console port as follows: 9600 baud, 8 data bits, no parity,

2 stop bits (9600 8N2). You need an RJ-45 console cable to connect the terminal to the

console port. After you establish normal Cisco uBR904 cable modem operation, you can

disconnect the terminal.

Installing the Cisco uBR904 Cable Modem 3-7

Connecting Power

Console Port Signals

The Data Set Ready (DSR) signal is active when the system is running. The console port

does not support modem control or hardware flow control. Table 3-1 lists the signals used

on the console port. The console port requires an RJ-45 cable.

Table 3-1 Console Port Signals

This completes the information necessary for connecting the console cables.

Connecting Power

Use the following procedures (see also Appendix Figure 3-5) to connect AC-input power

to the Cisco uBR904 cable modem.

Step 1 At the rear of the Cisco uBR904 cable modem, locate the power receptacle.

Step 2 Insert the cable from the power supply into the power receptacle.

Step 3 Plug one end of the power cord into the power supply.

Step 4 Plug the other end of the power supply into an AC power source.

This completes the procedure for connecting AC-input power.

Pin Signal Direction Description

1– – –

2 DTR —> Data Terminal Ready

3TxD —> Transmit

4GND – –

5GND – –

6 RxD <— Receive

7 DSR <— Data Set Ready (always on)

8– – –

Starting the Cisco uBR904 Cable Modem

Cisco uBR904 Cable Modem Installation and Configuration Guide

3-8

Note The cable modem has power when you connect it to the power outlet. It is meant to

be left on at all times, therefore it has no power switch. To turn the cable modem off, unplug

the power cord.

Figure 3-5 Connecting the Power Cord

Starting the Cisco uBR904 Cable Modem

After installing the Cisco uBR904 cable modem and connecting the cables, start the

Cisco uBR904 cable modem as follows:

Step 1 Connect the power supply to the cable modem. See the earlier section

“Connecting Power” for details.

Step 2 Watch the LEDs (lights) on the front of the cable modem. The OK (power) LED

on the front of the unit blinks for up to one minute. When the

Cisco uBR904 cable modem boot is complete (a few minutes), the OK LED

stays on and the ACT (cable) LED goes on.

11619

To cable

source

Power

supply

Installing the Cisco uBR904 Cable Modem 3-9

Starting the Cisco uBR904 Cable Modem

Step 3 Configure the Cisco uBR904 cable modem. When you start up the

Cisco uBR904 cable modem, a connection should be established to the

Cisco uBR7246 universal broadband router installed at the cable headend. The

Cisco uBR904 cable modem will be automatically configured by the universal

broadband router.

Note If the Cisco uBR904 cable modem does not complete each of the steps in the startup

procedure, proceed to the chapter “Troubleshooting the Installation,” for troubleshooting

recommendations and procedures.

If the Cisco uBR904 cable modem completes each of the steps in the startup procedure,

proceed to the section “Verifying the Installation” to verify that the connection to the

network is working properly.

This completes the installation of the Cisco uBR904 cable modem.

Starting the Cisco uBR904 Cable Modem

Cisco uBR904 Cable Modem Installation and Configuration Guide

3-10

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