2 Rev 2.2 • 27 Mar 10
1. Introduction
Product Overview
Mounting
The NV8500 family router frames mount in a standard 19″ rack. The frame heights are as follows:
NV8576, NV8576-Plus 32RU 55.97″ 1.422
m
NV8280, NV8280-Plus 16RU 27.97″ 0.710
m
NV8144 8RU 13.97″ 0.355
m
The depth of each frame is approximately 17″. With 3″ clearance for cabling, the minimum mount-
ing depth is approximately 20″. Doors add 0.8″ of depth.
When placing the rack in your facility, be sure to leave enough space for air flow through the front
and rear of the router and within easy access of an AC power source. For installation instructions,
see Rack Mount
on page 49.
Fuses
Routers in the NV8500 family have no user-serviceable fuses.
Cooling
Router frames in the NV8500 family have one or more fan trays providing forced air cooling
through five speed-controlled fans. In the NV8144, NV8280 and NV8280-Plus frames, a single fan
tray is located at the top of the chassis. For the NV8576 and NV8576-Plus frame, there are two fan
trays: one located at the top and one located at the bottom of the chassis. Fan trays are accessed
from the front of the frame. The fans draw cooling air from the center-front of the router, through
the door, and exhaust it through the rear of the frame at the top and bottom. The router must have
the door correctly installed and closed for proper airflow through the chassis.
Each fan features speed control which spins the fan at the optimal rate required to ensure that a con-
stant temperature is maintained within the router. Temperature sensors on the fans sense the exiting
temperature and increase or decrease the speed of the fan as required. By rotating only as required
to meet cooling needs, fan noise is significantly reduced in partially loaded frames or in environ-
ments with lower ambient temperatures. Maintaining a constant temperature also increases cir-
cuitry life span.
Each fan features two LEDs that indicate if the fan is receiving power and if there is a failure. For
more information, see Indicator LEDs
on page 101.
There is a removable air filter located on the inside of the door assembly. It is recommended that
maintenance filters be performed on a regular basis. For more information, see Air Flow
on page
103.
Caution If airflow is impeded, overheating may occur.
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