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Install the CMTS
Rack Mounting
95
To rack mount the chassis, follow this procedure:
1. Prior to rack mounting, ensure that proper clearance is maintained between the
G10 CMTS chassis and its surroundings to allow adequate air ventilation to flow into the
air intakes and out of the air exhaust:
! A minimum of 3 feet (0.91 m) between the front of the chassis and any other
object.
! A minimum of 2 feet (0.61 m) between the rear of the chassis and any other object.
! A minimum of 3 inches between each side of the chassis and any other object.
Figure 25 on page 96 illustrates the air flow through the chassis.
If there is no other equipment installed in the rack, you should install the G10 CMTS as
low as possible into the rack.
2. We recommend that you install an equipment shelf into the rack that can support the
maximum weight (140 lb, or 64 kg) and dimensions of the chassis. The chassis
dimensions, when viewed from the bottom, are provided in Figure 26 on page 97.
3. If the chassis will be front-rack mounted, jump ahead to step 5. If the chassis will be
mid-rack mounted, proceed to step 4.
4. Remove the seven screws fastening the mounting brackets to the front of the chassis,
align the brackets with the corresponding hole patterns in the center of the chassis, and
insert the seven screws into the chassis. Apply 20 in-lb of torque to each of the seven
screws.
In general, when more than one piece of equipment is
mounted into a rack, you should install the heaviest piece
of equipment at the bottom of the rack. Each successive
piece you install should be lighter than the piece
immediately below it. For planning purposes, a
minimally-populated G10 CMTS weighs approximately
80 lb (36 kg), and a fully-populated G10 CMTS weighs
approximately 140 lb (64 kg).
You must install the power supply faceplate prior to
powering on the G10 CMTS to ensure that proper air flow
occurs throughout the chassis.
The G10 CMTS does not require any clearance between the
bottom of the chassis and the floor. Similarly, there are no
clearance requirements between the top of the chassis and
the bottom of another G10 CMTS stacked above it on the
same rack (see Figure 29 on page 100).