NV8500 family Digital Routers • User’s Guide 101
5. Maintenance
Routers in the NV8500 family do not require any periodic electrical or physical maintenance. Other
than cleaning the fan air intake filter, all that is required is periodic inspection of the system to
make sure no failures have occurred.
It is recommended that the system’s indicator LEDs be checked on a regular basis to ensure that the
system is operating properly. (See Indicator LEDs
on page 101.) It is also a good idea to regularly
make sure cooling air flow to the power supply fans is unobstructed.
Fuse Replacement
There are no user-serviceable fuses.
Indicator LEDs
Indicator LEDs indicate whether DC power is present and if a card is operating normally. LEDs are
visible when the router front door is closed. In the following sections, LEDs are listed in the order
they appear on the cards, from top to bottom.
Power Supplies
The five green LEDs on the front of the power supply modules indicate presence of the five +48
VDC outputs of the five branch circuits. All five LEDs should be lit at all times when AC power is
present. If any LED is off, either the power supply has failed or the branch circuit is shorted.
Backplanes
Each backplane has indicator LEDs. If the red LED on the backplane lights, the card and backplane
do not match. If the green LED on the backplane lights, the card and backplane are a correcting
pairing. (See Backplanes
on page 29.)
Caution Only qualified service personnel should perform procedures in this section.
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