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NK-3G144 User Guide (v04) Hardware Overview • 15
Hardware Overview
This chapter presents information on the NK-3G144 hardware components including the chassis, front and rear
panels, and LEDs.
Front Panel
The front panel of the NK-3G144 Routing Switcher is a hinged door, held in place by a screw and two latches. It
swings open to the left. The Heartbeat LED in the name badge indicates the operational and alarm status of the unit.
Figure 3.1 NK-3G144 — Front Panel
The front panel of the door has a ventilation grill, and behind that, reusable filters. There are two banks of three fans
on the inside of the front panel (see
Figure 3.2 ). The top bank of fans intakes air at the front of the unit, then blows
this over the matrix core and the input cards. Similarly, the bottom bank of fans blows air onto the output cards. The
speed of each fan is monitored and varied as required for the measured temperature of the cards. If the fan is not at
the correct speed, or the temperature of the cards is too high, a fault is indicated.
NK - 3G144 3G HD/SD Router
Heartbeat LED
Latches Screw