Installing the Cisco uBR910 Series DSU

Cisco uBR910 Series Installation Checklist

Verifying Power Requirements

Installing the Chassis

Cisco uBR914 DSU

Mounting Guidelines

Attaching the Rack-Mount Brackets

Installing the Cisco uBR914 in a Rack

Connecting to the Cable System

Connecting the Serial Cable to the Access Router

Connecting Power

Power-On and Initialization Sequence

Installing the Cisco uBR910 Series DSU

This chapter contains the following sections that provide instructions on installing the Cisco uBR910 series cable data service unit (DSU), initial power-on, and verifying the installation:

Caution Before proceeding with the installation, verify that you have fulfilled all of the requirements listed in "Preparing for Installation." Also read and follow the safety guidelines in the "Safety" section, as well as those contained in this chapter.

Cisco uBR910 Series Installation Checklist

Table 3-1 presents a checklist, identifying the installation tasks to complete at each subscriber site. Use this table as a guide while installing the Cisco uBR910 series DSU.

Table 3-1: Installation Checklist

Checked Off Task For More Information, See...

Ensure the selected location for installation is free of dust and meets all requirements.

"Environmental" section

Check the power at the subscriber site before and after installation to ensure that you are receiving clean power. Ensure proper grounding.

"Verifying Power Requirements" section

For the Cisco uBR914 with the optional redundant power supply (RPS), install the RPS adapter plate into the Cisco uBR914 chassis and connect it to the RPS.

The documentation that accompanies the RPS adapter plate and the RPS.

Install the Cisco uBR910 series DSU:

Close to the cable drop connection and to the access router serving as the gateway for the local area network (LAN).

Close to the power source---depending on the country of operation, the power source must be a grounded 100 to 240 VAC outlet.

For the Cisco uBR914---If in a rack-mount, near the existing access router and the cable drop connection. If not in a rack-mount, on a stable, flat surface or desktop close to the devices to be connected such that your cables reach all devices, but in a location where the bottom, sides, and rear of the chassis are clear of obstructions and away from the exhaust of other equipment.

"Installing the Chassis" section

Connect the F-connector on the back panel to the cable TV coaxial drop cable. (If the subscriber also subscribes to cable TV services, install a cable splitter/directional coupler and high-pass filter as appropriate.)

"Connecting to the Cable System" section

Connect the Cisco uBR910 series to the access router at the site.

"Connecting the Serial Cable to the Access Router" section

Connect the Cisco uBR910 series to the power supply:

For the Cisco uBR914 with an AC power supply---Connect the plug-end of the power supply cord to the power connector on the back panel of the Cisco uBR914 DSU. Plug the three-prong end of the power supply cord in to the wall outlet. Turn on the Cisco uBR914 DSU by turning the power switch on the rear panel to the ON position.

For the Cisco uBR914 with the RPS option---Connect the RPS cable to the RPS adapter plate on the Cisco uBR914 back panel and then to the DC power connector on the RPS back panel. Power on the RPS and watch the system power on and initialize. Turn on the Cisco uBR914 DSU by turning the power switch on the rear panel to the ON position.

"Connecting Power" section

Power on all other devices at the subscriber site, including the access router.

"Power-On and Initialization Sequence" section

Ensure the data channel frequency has a sufficient RF signal level to meet your cable plant specifications and verify the RF input levels relative to a nearby analog video level:

Check the RF signal with an RF power meter at the Type F coax connector to verify the DOCSIS system signal.

Verify the nearby analog video signal is within the correct range---0 to +15 dBmV for most CATV systems.

Checked Off	Task	For More Information, See...
	Ensure the selected location for installation is free of dust and meets all requirements.	"Environmental" section
	Check the power at the subscriber site before and after installation to ensure that you are receiving clean power. Ensure proper grounding.	"Verifying Power Requirements" section
	For the Cisco uBR914 with the optional redundant power supply (RPS), install the RPS adapter plate into the Cisco uBR914 chassis and connect it to the RPS.	The documentation that accompanies the RPS adapter plate and the RPS.
	Install the Cisco uBR910 series DSU: Close to the cable drop connection and to the access router serving as the gateway for the local area network (LAN). Close to the power source---depending on the country of operation, the power source must be a grounded 100 to 240 VAC outlet. For the Cisco uBR914---If in a rack-mount, near the existing access router and the cable drop connection. If not in a rack-mount, on a stable, flat surface or desktop close to the devices to be connected such that your cables reach all devices, but in a location where the bottom, sides, and rear of the chassis are clear of obstructions and away from the exhaust of other equipment.	"Installing the Chassis" section
	Connect the F-connector on the back panel to the cable TV coaxial drop cable. (If the subscriber also subscribes to cable TV services, install a cable splitter/directional coupler and high-pass filter as appropriate.)	"Connecting to the Cable System" section
	Connect the Cisco uBR910 series to the access router at the site.	"Connecting the Serial Cable to the Access Router" section
	Connect the Cisco uBR910 series to the power supply: For the Cisco uBR914 with an AC power supply---Connect the plug-end of the power supply cord to the power connector on the back panel of the Cisco uBR914 DSU. Plug the three-prong end of the power supply cord in to the wall outlet. Turn on the Cisco uBR914 DSU by turning the power switch on the rear panel to the ON position. For the Cisco uBR914 with the RPS option---Connect the RPS cable to the RPS adapter plate on the Cisco uBR914 back panel and then to the DC power connector on the RPS back panel. Power on the RPS and watch the system power on and initialize. Turn on the Cisco uBR914 DSU by turning the power switch on the rear panel to the ON position.	"Connecting Power" section
	Power on all other devices at the subscriber site, including the access router.	"Power-On and Initialization Sequence" section
	Ensure the data channel frequency has a sufficient RF signal level to meet your cable plant specifications and verify the RF input levels relative to a nearby analog video level: Check the RF signal with an RF power meter at the Type F coax connector to verify the DOCSIS system signal. Verify the nearby analog video signal is within the correct range---0 to +15 dBmV for most CATV systems.

Verifying Power Requirements

The Cisco uBR914 uses an internal AC-input power supply or the redundant power supply (RPS) option. The Power and Activity LEDs on the front panel indicate that the system is receiving power and is operational. The RPS LED on the front panel indicates that the optional RPS is connected and supplying power to the unit.

The power supply uses a power factor corrector that allows the Cisco uBR910 series DSU to operate in any country where the input voltage is between 100 and 240 VAC, and 50 or 60 Hz. Different power cords are available to suit the country of operation. Refer to Table A-1 for AC-input power supply specifications, including input voltage and operating frequency ranges.

Caution Do not connect the Cisco uBR910 series DSU to power at this point because the system will begin its initial power-on sequence and attempt to connect to the network. The unit should be powered on only after all other connections have been made, as described later in this chapter.

Cisco recommends that you follow these precautions:

Check the power at the subscriber site before and after installation to ensure that you are receiving clean power. Install a power conditioner if necessary.
If plugging the Cisco uBR910 series into an uninterruptible power supply (UPS), verify that the total power and current requirements used by all devices plugged in to the UPS are within the maximum limits of the UPS.
Install proper grounding to avoid damage from lightning and power surges. If using a North American (NEMA 5-15P) plug, you must plug the unit into a three-lead receptacle to ensure proper grounding.

Warning 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.

Ensure that a fuse or circuit breaker no larger than 120 VAC, 15A U.S. (240 VAC, 10A International) is used on the phase conductors (all current-carrying conductors providing power to the device).
Do not work on the system or connect or disconnect any cables (Ethernet, cable, or power) during periods of lightning activity---the possibility of serious physical injury exists if lightning should strike and travel through those cables. In addition, the equipment could be damaged by the higher levels of static electricity present in the atmosphere.

Note Adhere to the safety guidelines presented in the "Safety" section before following procedures in the remainder of this chapter. Be sure all equipment to be connected to the Cisco uBR910 series is powered off.

Installing the Chassis

This section describes how to physically install the chassis for the Cisco uBR910 series DSU. The Cisco uBR914 DSU can be mounted in a standard 19-inch rack (or a 24-inch rack with the optional extender brackets).

Cisco uBR914 DSU

The Cisco uBR914 DSU can be installed in a standard 19-inch rack, or a standard 24-inch rack with the optional extender brackets. See the following sections for guidelines and instructions in mounting the Cisco uBR914 DSU.

Mounting Guidelines

When mounting the Cisco uBR914 in a 19-inch or 24-inch rack, use the following guidelines for personal safety and to ensure the system remains stable:

If the Cisco uBR914 will be the first unit in the rack, mount it at the bottom of the rack.
If the rack is partially filled, load the rack from the bottom to the top, with the heaviest component at the bottom of the rack.
If the rack contains stabilizing devices, install the stabilizers prior to mounting or servicing any units in the rack.
When mounting a chassis in an open rack, ensure that the rack frame does not block the intake or the exhaust ports. If the Cisco uBR914 is installed on slides, check the position of the chassis when it is seated all the way into the rack.
Verify that the distribution of units in the rack allows for proper ventilation and heat dissipation. If the rack is an enclosed rack, ensure it has adequate ventilation, with louvered sides and a fan that distributes cooling air.
In an enclosed rack with a ventilation fan in the top, excessive heat generated by equipment near the bottom of the rack can be drawn upward and into the intake ports of the equipment above it in the rack. Ensure that you provide adequate ventilation for equipment at the bottom of the rack.
Baffles can help to 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 arrangements.

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.

Caution The Cisco uBR914 DSU does not support wall-mounting.

Attaching the Rack-Mount Brackets

This section describes the procedures for rack-mounting the Cisco uBR914. The Cisco uBR914 ships with brackets for use with a 19-inch rack or, if specified in your order, optional extender brackets for use with a 23- or 24-inch rack. The brackets are shown in Figure 3-1.

Figure 3-1: Rack-Mount Brackets for the Cisco uBR914

To install the chassis in a rack, attach the brackets in one of the following ways, using the Cisco-supplied screws:

With the front panel forward (see Figure 3-2 and Figure 3-3)
With the rear panel forward (see Figure 3-4 and Figure 3-5)
In a center-mount rack, with the rear panel forward (see Figure 3-6)

Note When installing a Cisco uBR914 in a 19-inch rack with a 17.5-inch opening, orient the rack-mount brackets so that, when installed, they do not increase the width of the chassis, as shown in Figure 3-2. When installing a Cisco uBR914 DSU in a 19-inch EIA-standard rack with a 17.75-inch opening or when installing in a 24-inch rack, orient the rack-mount brackets so that, when installed, they increase the width of the chassis, as shown in Figure 3-3.

Note The following illustrations show how to connect the bracket to one side of the chassis. The second bracket connects to the opposite side of the chassis.

Figure 3-2: Bracket Installation---Front P anel Forward (19-Inch Rack with a 17.5-Inch Opening)

Note When installed in a 19-inch rack with a 17.75-inch opening, the Cisco uBR914 will protrude beyond the front of the rack.

Figure 3-3: Bracket Installation---Front P anel Forward (19-Inch Rack with a 17.75-Inch Opening or a 24-Inch Rack)

Figure 3-4: Bracket Installation---Rear P anel Forward (19-Inch Rack with a 17.5-Inch Opening)

Figure 3-5: Bracket Installation---Rear Panel Forward (19-Inch Rack with a 17.75-Inch Opening or a 24-Inch Rack)

Figure 3-6: Center-Mount Bracket Instal lation---Rear Panel Forward

Installing the Cisco uBR914 in a Rack

After the brackets are secured to the chassis, you can rack-mount it. Using screws that you provide, attach the chassis to the rack. (See Figure 3-7 and Figure 3-8).

Figure 3-7: Mounting the Chas sis in a Rack (19-Inch Rack with a 17.5-Inch Opening)

Figure 3-8: Mounting the Chas sis in a Rack (19-Inch Rack with a 17.75-Inch Opening or a 24-Inch Rack)

Connecting to the Cable System

To connect the Cisco uBR910 series DSU to the cable system:

Step 1 Verify that the unit is not connected to power.

Step 2 Locate the RF coaxial cable coming from the CATV wall outlet.

Step 3 Install a cable splitter/directional coupler if needed to separate signals for TV and computer usage. If necessary, also install a high-pass filter to prevent interference between the TV and computer signals.

Step 4 Connect the RF coaxial cable to the F-connector on the back panel. Hand-tighten the connector, making sure it is finger tight; then give it a 1/6 turn with a wrench. See Figure 3-9.

Figure 3-9: Connecting the CATV Coaxial Cable to the Cisco uBR910 Series

Caution Do not overtighten the connector. Overtightening can break off the connector. Using a torque wrench is not recommended because of the danger of tightening the connector more than the recommended 1/6 turn after it is finger tight.

Step 5 Make sure all other coaxial cable connectors---all intermediate splitters, couplers, or ground blocks---are securely tightened from the distribution tap to the Cisco uBR910 series, following instructions in step 4.

Note Loose connectors inside the building or residence can cause intermittent operation.

Caution To ensure compliance with FCC limits, connection to the cable system must be made with a high-quality, shielded cable. If the quality or general condition of the coaxial cable at the subscriber site is in question, Cisco recommends that you replace the coaxial cable. For more information on the effects of substandard cabling on the Cisco uBR910 series installation, see the "CATV Coaxial Cabling" section.

Connecting the Serial Cable to the Access Router

This section provides instructions on connecting the serial interfaces on the Cisco uBR910 series DSU and the access router. Before proceeding, be sure you have read the "Serial Interface Operations" section, and have chosen the proper interfaces and protocol for your installation.

Step 1 Verify that both the Cisco uBR910 series DSU and the access router are turned OFF. Power should not be supplied to either unit until after all cables have been connected.

Step 2 Obtain the serial cable required for your installation. See the "Serial Interface Connector and Cabling" section for information on how to select the proper cable(s).

Step 3 Connect the serial cable to the router interface module on the Cisco uBR910 series DSU.

Step 4 Connect the other end of the serial cable to the access router.

Step 5 If you used two cables for each of the two previous steps, connect the two cables together using their matching connectors.

Step 6 Secure all connectors using the screws provided on the cables.

Step 7 Verify the cabling between the units and that the cables have been secured as needed.

Proceed to the next section to connect power and complete the installation.

Connecting Power

This section describes how to connect the AC-input power supply to the Cisco uBR910 series.

Note If you purchased the redundant power supply (RPS) option, see the documentation that accompanied the RPS for instructions on installing the RPS adapter plate into the Cisco uBR914 and connecting it to the RPS.

To connect AC-input power to the Cisco uBR910 series DSU:

Step 1 Locate the power receptacle at the rear of the chassis. (See the "Verifying Power Requirements" section to verify that this power source is adequate.)

Step 2 For the Cisco uBR914, do one of the following:

a. If using the AC power supply, plug the three-prong plug into the power connector on the back panel.

b. If using the redundant power supply (RPS) option, connect the RPS adapter plate to the RPS, using the proper RPS cable, as described in the documentation that accompanied the adapter kit.

Step 3 For the Cisco uBR914 DSU using the AC power supply, plug the power supply into a standard electrical power outlet at the site. If using the RPS option, connect the RPS adapter plate on the back panel of the Cisco uBR914 to a DC connector on the back panel of the RPS. Turn on the power switch on the rear panel of the Cisco uBR914 and then, if necessary, turn on the power switch on the RPS to apply power.

Step 4 Turn ON power for all other equipment, including the access router if necessary, and wait for the devices to complete their startup processes.

Caution To prevent electrical shock, do not disconnect the AC power supply cord from the power supply while the system is operating. The Cisco uBR914 can be turned off by flipping its power switch to the OFF position.

Warning Failure to properly ground the Cisco uBR914, either by circumventing the three-wire grounding-type plug or by using a power outlet that is improperly grounded, can create a potentially hazardous electrical situation.

Power-On and Initialization Sequence

When the Cisco uBR910 series DSU is connected and powered on, it executes automatic self-diagnostic and installation procedures. The following procedure describes what you should see during this process.

Note For the Cisco uBR910 series to complete its power-on sequence, a number of tasks must be completed at the CMTS. See the "Initial Power-On and Provisioning" section for an overview of the initialization and provisioning processes.

While the Cisco uBR910 series DSU initializes:

Step 1 Watch the LEDs on the front panel. When the unit first powers on, all LEDs (except for the ACT LEDs) briefly light and then turn off. As self-test is executed, various LEDs light to reveal diagnostic progress and turn off when self-test is complete.

Step 2 The OK LED blinks as the system completes self-test and boots a Cisco IOS image. When this is finished, the OK LED lights again.

Step 3 During the system's initialization and download, the green OK and ACT LEDs blink. After completing the download procedure (which could take up to 10 minutes if downloading a new Cisco IOS image as well as a configuration file), the green OK LED remains on.

Step 4 Check that the DS, US, LINK, and DSNR LEDs remain on to indicate the Cisco uBR910 series is operational and receiving a healthy signal:

The DS LED reveals the Cisco uBR910 series is locked to a downstream channel.
The US LED reveals the Cisco uBR910 series has established connectivity with the CMTS and is operating within 6 dB of desired power level (generally within 3 dB).
The LINK LED reveals the cable interface is operational.
The DSNR LED reveals the Cisco uBR910 series is receiving a quality downstream signal, defined as a signal with a low signal-to-noise ratio (a signal that is more than 5 dB above the downstream lock threshold).

Step 5 Check that the ACT LEDs blink to indicate activity on the cable and serial interfaces.

Step 6 If all LEDs appear normal, configure the Cisco uBR910 series DSU and access router as needed so that traffic is routed between the serial interface and cable interface as desired. See the Cisco uBR910 Series Software Configuration Guide for more details.

Step 7 After verifying operations, acquaint the subscriber with the recommended ambient temperature requirements listed in "Technical Specifications." Remind the subscriber to keep the area around the chassis as free from dust as is practical and review general safety standards.

Step 8 Give the subscriber the Cisco-provided subscriber publications, along with any literature your company provides, including the instructions on how to contact your customer service department.

Table of Contents

Installing the Cisco uBR910 Series DSU