- Nortel Network Multiservice Platform User's Guide

3-40 Hardware feature descriptions
OPTera Metro 3500 Multiservice Platform NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004
OPTera Metro 3500 cooling unit assembly and cooling unit fan
modules
(NTN458QA)
The cooling unit assembly (NTN458QA) contains three cooling unit fan
modules (NTN458HC) and environmental sensors. See Figure 3-23. The
cooling unit assembly forces air through the shelf when environmental
conditions require a decrease in the shelf temperature.
See Table 3-3 on page 3-6 for operational temperature ranges.
Note 1: The Universal shelf cooling unit assembly (NTN458QH) is only
supported on the OPTera Metro 3500 Universal Shelf Assembly
(NTN476AH).
Note 2: The Cooling unit assembly (NTN458QA) is only supported on the
OPTera Metro 3500 Shelf Assembly (NTN476DA and NTN476AA).
Note 3: The Fan kit (NTN458GA) is only supported on the OPTera Metro
3500 Shelf Assembly (NTN476AA).
Figure 3-23
OPTera Metro 3500 Cooling unit assembly (NTN458QA)
EX0994p
Cooling unit fan modules
Attaching screw (2)
Plenum
Retaining
screws
Front view
Plastic
baffle