User's Manual

260-668066-003 Rev 002 October 2001 6-7
Eclipse Installation Manual
Fuses
The NCC and NPC are fitted with a fast-acting 25 A fuse fitted on the PCB behind the
power cable connector.
The PCC is fitted with a fast-acting PCB-mounted 20A fuse.
NCC, NPC and PCC fuses are not field-replaceable.
FAN Air Filter Option
A fan air filter option is available for installation with the FAN module in an INU, and
with the 2RU FAN module in an INUe. Where Eclipse is required to be NEBS (Network
Equipment-Building System) compliant, the fan air filter must be installed.
The fan air filter must be inspected regularly and replaced when dust
laden. In normal telecommunications equipment-room environments
inspection must be at not more than 12 monthly intervals. In other
environments where air quality is not controlled, more frequent
inspection is required.
A heavily dust-laden filter will severely restrict fan air flow and
may lead to over-heating.
Excessive heat is the number one cause of premature equipment
aging and failure.
To maximize long term component reliability, the fan air filter
must not be allowed to become clogged, and ambient
temperature limits must not be exceeded.
Fan Air Filter Installation
The fan air filter kit comprises a filter frame, filter element, and fastening screw. It is
installed in the INU/INUe to the right side of the FAN module, as illustrated in Figure
6-5 for an INUe.
1. Remove the FAN module and slide the air filter into the chassis so that it locates to
the right side of the FAN module backplane connector, and up against the chassis
side.
FAN module removal and replacement does not affect INUe traffic.
2. Fasten in place using the screw supplied. Do not over-tighten - the screw is
designed to bite into the unthreaded hole provided in the plastic frame.
3. Replace the FAN module.