Installing the Cisco cBR Chassis
Installing the Cisco cBR Chassis
• Installation Methods, page 1
• Verifying Rack Dimensions, page 2
• Installing Chassis Installation Brackets, page 3
• Attaching the Chassis Rack-Mount Brackets, page 5
• Installing the Chassis Installation Handle (Optional), page 7
• Installing the Cisco cBR-8 In a Rack, page 9
• Attaching the Cable-Management Brackets, page 14
• Attaching the Fiber/Cable Routing Guide on the Chassis, page 15
• Attaching a Chassis Ground Connection, page 21
Installation Methods
The Cisco cBR-8 router can be either mounted on the rack at the front or in the middle. Also, the router can
be either mounted on a standard 19-inch wide four-post equipment rack unit or a two-post rack unit.
Note
The Cisco cBR-8 router usually ships fully loaded. Due to a fully configured system weighing approximately
430 lbs, components must be removed from the chassis to make the chassis lighter for rack installation.
Remove all power supplies, supervisor cards, line cards, rear PIC cards and fan modules before
rack-mounting to reduce the weight to approximately 117 lbs. For instructions on how to remove the
components, see the monitoring sections.
Note
Make sure you place the cards and modules in an anti-static bag until you install the chassis in the rack.
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Installing the Cisco cBR Chassis
Verifying Rack Dimensions
Verifying Rack Dimensions
Before You Begin
Before you install the chassis, measure the space between the vertical mounting flanges (rails) on your
equipment rack to verify that the rack conforms to the measurements shown in the figure below.
Figure 1: Equipment Rack Dimensions
Step 1
Mark and measure the distance between two holes on the left and right mounting rails.
The distance should measure 18.31 inches ± 0.06 inches (46.5 cm ± 0.15 cm).
Measure the pairs of holes near the bottom, middle and top of the equipment rack to ensure that the rack posts
are parallel.
Measure the space between the inner edges of the left front and right front mounting flanges on the equipment rack.
The space must be at least 17.7 inches (45 cm) to accommodate the chassis which is 17.45 inches (44.3 cm) wide and
fits between the mounting posts on the rack.
Note
Step 2
What to Do Next
Install chassis installation brackets.
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Installing the Cisco cBR Chassis
Installing Chassis Installation Brackets
Installing Chassis Installation Brackets
Each chassis is shipped with two chassis installation brackets in the accessory kit. These brackets aid in
installing a chassis into a 19-inch rack and are used as a support base to vertically position and set the chassis
before the rack mount screws are installed.
Step 1
Step 2
Determine the position in the rack where you want the chassis to be mounted. If you are mounting more than one chassis
in the rack, then start from the bottom or the center of the rack. Hold the chassis installation bracket where the chassis
bottom will be positioned vertically in the rack.
Secure the chassis installation bracket to the front rails with rack mount screws.
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Installing the Cisco cBR Chassis
Installing Chassis Installation Brackets
If there is a second internal rack rail that is no more than 23 inches from the front rail, position the second installation
bracket to create a rear support for the chassis during installation.
Figure 2: Chassis Installation Bracket
1
Note
Chassis Installation Bracket
After the chassis is installed and secured to the rack the chassis installation brackets can be removed from the
rack. These brackets are not needed for supporting the weight of the chassis after all rack mount screws are
secured.
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Installing the Cisco cBR Chassis
Attaching the Chassis Rack-Mount Brackets
Attaching the Chassis Rack-Mount Brackets
Before installing the chassis in the rack, you must install the rack-mount brackets on each side of the chassis.
Note
The rear RF cable-management brackets are installed on the chassis after you install the chassis rack-mount
brackets and mount the chassis in the rack.
Rack-mounting brackets can be attached either in front or middle of the chassis.
• Front Rack-Mount Bracket Installation—The chassis is shipped with the rack-mount brackets installed
at the front. Proceed to installation of the chassis in the rack.
• Middle Rack-Mount Bracket Installation—Install the mounting bracket in the middle of the chassis to
allow the chassis to be recessed in the rack or to be installed in a two-post rack unit.
Note
The chassis installation handle cannot be installed if the chassis is mid-mounted.
To install the rack-mount brackets in the middle of the chassis, complete the following steps:
Before You Begin
Required Tools and Equipment
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Installing the Cisco cBR Chassis
Attaching the Chassis Rack-Mount Brackets
• #2 Phillips torque screwdriver
Step 1
Step 2
Step 3
Step 4
Remove the rack-mount brackets installed at the front of the chassis by unscrewing the M5 undercut flat-head screws
using a #2 Phillips torque screwdriver.
Locate the threaded holes at the middle on the side of the chassis that align with the holes in the rack-mount bracket.
Install the 10 M5 undercut flat-head screws to secure each rack-mounting bracket to the chassis. Five screws must be
installed on each end of the rack-mounting bracket.
Repeat the above steps on the other side of the chassis.
Figure 3: Installing Rack-Mount Bracket
1
Chassis
2
M5 undercut flat-head screws
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3
Rack-Mount Bracket
Installing the Cisco cBR Chassis
Installing the Chassis Installation Handle (Optional)
What to Do Next
Install the chassis installation handle.
Installing the Chassis Installation Handle (Optional)
Before You Begin
Required Tools and Equipment
• #2 Phillips screwdriver
Restrictions
Do not install the chassis installation handle if the chassis is to be mid-mounted in the rack.
Step 1
Step 2
Locate two M5 threaded holes on each chassis rack mount bracket that align with the chassis lifting handle captive screw
holes.
Align and hold the chassis lifting handle screw holes with the M5 threaded holes. Insert the captive screws and tighten
them using a #2 Phillips screwdriver.
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Installing the Cisco cBR Chassis
Installing the Chassis Installation Handle (Optional)
Caution
Ensure that the captive screws are tightly secured before loading the handles to prevent injury or damage to
the chassis.
Figure 4: Attaching the Chassis Installation Handles to the Cisco CBR-8 Converged Broadband Router
1
Chassis Installation Handle
2
Captive Screw
3
Chassis
—
The rack mount brackets support both low and high installation of the handles. This is to facilitate low or high chassis
installation in the rack.
What to Do Next
Install the Cisco cBR-8 router in the rack.
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Installing the Cisco cBR Chassis
Installing the Cisco cBR-8 In a Rack
Installing the Cisco cBR-8 In a Rack
Rack mount the chassis by securing the rack-mount brackets to two posts or mounting strips in the rack. Use
at least four rack-mount screws on each side to fasten the two rack-mount brackets to the rack posts because
the rack-mount brackets support the weight of the entire chassis.
You can install the chassis in either a four-post rack unit or a two-post rack unit.
Before You Begin
1 Verify rack dimensions.
2 Install chassis installation brackets.
3 Attach the chassis rack-mount brackets.
4 Install the chassis installation handle (optional).
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.
Installing the Cisco cBR in a Four-Post Rack
Step 1
Step 2
Step 3
Ensure that all screw fasteners on the installed components are securely tightened on the chassis.
Ensure that your path to the rack is unobstructed. If the rack is on wheels, ensure that the brakes are engaged or the rack
is stabilized.
With two or more people, lift the chassis (partially unloaded) into position between the rack posts and rest it on the
chassis installation bracket. The chassis can be lifted using the installation handle, the two large side handles, the rear
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Installing the Cisco cBR Chassis
Installing the Cisco cBR in a Four-Post Rack
Power entry area handles or by placing your hands underneath the bottom of the chassis. With the installation handle
installed, you can tilt the chassis up in the front in order to get your hands underneath the bottom of the chassis.
Figure 5: Lifting the Chassis into Position
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Installing the Cisco cBR Chassis
Installing the Cisco cBR in a Four-Post Rack
Step 4
Step 5
After the rear weight of the chassis is resting on the installation bracket, one person can hold it in place while the second
person moves to the rear of the rack to help slide it into place and hold the weight while the rack mount screws are
tightened.
Position the chassis until the rack-mounting flanges are flush against the mounting rails on the rack.
Figure 6: Flushing Against Mounting Rails
Step 6
Hold the chassis in position against the mounting rails and do the following:
a) Insert a bottom screw into the rack mount ear on each side and use a hand-held screwdriver to tighten the screw to
the rack rail.
b) Insert a top screw into each side rack mount bracket and tighten the screw to the rack rail. Insert a minimum of 4
screws per bracket on both sides of the chassis.
Note
Remove the chassis installation handle before installing the fourth screw.
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Installing the Cisco cBR Chassis
Installing the Cisco cBR in a Two-Post Rack
What to Do Next
• If required, remove the chassis installation brackets after ensuring that all screws are tightly secured to
the rack unit.
• Attach the cable management bracket.
Installing the Cisco cBR in a Two-Post Rack
The Cisco cBR chassis can be installed in a two-post 19-inch rack either as a front mount or a mid-mount.
The procedure for the front mount option in a two-post rack is identical to the procedure for front mounting
in a four-post rack except you cannot use the second chassis installation bracket.
Caution
If you are using a two-post rack, secure the rack to the floor surface to prevent tipping and avoid bodily
injury and component damage.
To mid-mount the chassis, follow these steps:
Step 1
Step 2
Step 3
Step 4
Step 5
Step 6
Step 7
Ensure that all screw fasteners on the installed components are securely tightened on the chassis.
Ensure that your path to the rack is unobstructed. If the rack is on wheels, ensure that the brakes are engaged or the rack
is otherwise stabilized.
(Optional) Install the chassis installation bracket into the rack to support the chassis during installation while you secure
it to the rack.
With two or more people, lift the chassis (partially unloaded) into position between the rack posts and rest it on the
chassis installation bracket. The chassis can be lifted using the two large side handles, the rear Power entry area handles
or by placing your hands underneath the bottom of the chassis.
After the rear weight of the chassis is resting on the installation bracket, one person can hold it in place while the second
person moves to the rear of the rack to help slide it into place and hold the weight while the rack mount screws are
tightened.
Position the chassis until the rack-mounting flanges are flush against the mounting rails on the rack.
Hold the chassis in position against the mounting rails and do the following:
a) Insert a bottom screw into the rack mount ear on each side and use a hand-held screwdriver to tighten the screw to
the rack rail.
b) Insert a top screw into each side rack mount bracket and tighten the screw to the rack rail.
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Installing the Cisco cBR Chassis
Installing the Cisco cBR in a Two-Post Rack
c) Insert a minimum of four screws per bracket on both sides of the chassis.
Step 8
Ensure that all the screws on each of the side rack-mount brackets are tightened to the equipment rack before the chassis
installation bracket is removed from the rack.
Figure 7: Two-Post Rack Mounting
What to Do Next
Attach the cable management bracket.
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Installing the Cisco cBR Chassis
Attaching the Cable-Management Brackets
Attaching the Cable-Management Brackets
The rear RF cable-management brackets mount to the right rear side of the chassis to provide cable-management
to coaxial cables exiting the RF PIC modules. These brackets provide a reference configuration that allows
installation and removal of cables and modules in the rear of the chassis.
Each RF cable-management bracket for the Cisco cBR chassis contains four independent "U" type
cable-management provisions, with two captive screws for attaching to the chassis, and provides cable dressing
of each RF PIC card slot.
Before You Begin
Required Tools and Equipment
• #2 Phillips torque screwdriver
Step 1
Step 2
Align the cable-management bracket captive screws to the right rear side panel captive nuts of the chassis. There are
multiple positions that allow you to determine the position of the bracket that best suits your installation.
If the captive screws are accessible, use a #2 Phillips torque screwdriver to secure them to the chassis. Else, tighten the
knurled captive screws using your fingers.
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Installing the Cisco cBR Chassis
Attaching the Fiber/Cable Routing Guide on the Chassis
Note
Do not over tighten the cable-management captive screws when using a #2 Phillips torque screwdriver. Torque
must not exceed 7 in-lbs.
Figure 8: Installing the Cable-Management Brackets
Attaching the Fiber/Cable Routing Guide on the Chassis
The fiber/cable routing accessories are made up of:
• 2 strap-down clips
• 4 snap-on plastic fiber/cable routing guides—with upper slot for fiber and lower slot for copper cables
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Installing the Cisco cBR Chassis
Attaching the Fiber/Cable Routing Guide on the Chassis
The strap-down clips have multiple uses. They can be used:
• to strap down cable bundles or conduit (there are multiple tie down points on each strap-down clip)
• as a base for two snap-on plastic fiber/cable routing guides
Before You Begin
Required Tools and Equipment
• 4 knurled retaining screws
• T15 Torx driver (optional)
• 2 strap-down clips
• 4 snap-on plastic cable routing guides
Step 1
Insert the four knurled retaining screws on the side of the chassis and tighten them using a T15 Torx driver (up to a
torque of 6-8 in-lbs). If the screw location is not accessible for a driver, you can tighten the knurled screws by hand.
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Installing the Cisco cBR Chassis
Attaching the Fiber/Cable Routing Guide on the Chassis
1
Step 2
Knurled Retaining Screws
—
Align the slots on the strap-down clip with the knurled screws installed on the chassis and push down until it snaps in
place.
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Installing the Cisco cBR Chassis
Attaching the Fiber/Cable Routing Guide on the Chassis
Step 3
Step 4
Repeat Step 2, on page 17 for the other strap-down clip.
Attach the snap-on plastic guides on the strap-down clip, as necessary.
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Installing the Cisco cBR Chassis
Attaching the Fiber/Cable Routing Guide on the Chassis
Note
1
Ensure that the orientation of the fiber/cable routing guide is proper by placing the smaller slot used for fiber
on the top.
Strap-Down Clip
2
Snap-on Plastic Fiber/Cable Routing Guide
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Installing the Cisco cBR Chassis
Attaching the Fiber/Cable Routing Guide on the Chassis
Figure 9: Chassis with Strap-Down Clips
Figure 10: Chassis with Fiber/Cable Routing Guides and RF Cable Management Brackets
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Installing the Cisco cBR Chassis
Attaching a Chassis Ground Connection
Attaching a Chassis Ground Connection
Before You Begin
Warning
This equipment must be grounded. 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. Statement 1024
Before you connect power or turn on power to your chassis, you must provide an adequate chassis ground
(earth) connection for the chassis. A chassis ground connector is provided on each Cisco CBR-8 chassis.
Caution
The grounding wire is always the first to be installed or connected and the last to be removed or
disconnected.
Required Tools and Equipment
• Phillips Screwdriver
• ¼-20 Phillips pan head with square cone lock washer (provided in accessory kit)
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Installing the Cisco cBR Chassis
Attaching a Chassis Ground Connection
• 2 hole 4 AWG dual crimp compression lug (provided in accessory kit)
• 4 or 2 AWG grounding wire—The ground wire and lug should always be as big as the input gauge. For
example, to use 2 AWG for the DC inputs, the ground lug and wire should be 2 AWG or bigger.
• Crimping tool for ground lug
Step 1
Step 2
Step 3
Step 4
Step 5
Use the wire stripper to strip one end of the AWG #4 wire approximately 1.12 inches (28.4 mm).
Insert the AWG #4 wire into the wire receptacle on the grounding lug.
Use the crimping tool to carefully crimp the wire receptacle around the wire; this step is required to ensure a proper
mechanical connection.
Locate the chassis ground area on the rear lower left side panel of your chassis.
Insert the two ¼-20 screws (provided in the accessory kit) through the holes in the grounding lug and tighten until the
grounding lug is held firmly to the chassis.
Note
There are captive nuts provided on the rear lower left side of the chassis for attaching a two-hole ground lug.
Three nuts are provided for the attachment so the lug can be mounted horizontally or vertically depending on
wire routing preferences.
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Installing the Cisco cBR Chassis
Attaching a Chassis Ground Connection
Step 6
Connect the opposite end of the grounding wire to the appropriate grounding point at your site to ensure an adequate
chassis ground.
Figure 11: Chassis Ground Connection
1
Chassis earth ground lug and lead wire
3
Earth ground lug holes on the chassis
2
¼-20 Grounding screws
4
Earth ground symbol
The grounding lug can be mounted horizontally (as shown) or vertically depending on site preference.
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Installing the Cisco cBR Chassis
Attaching a Chassis Ground Connection
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