3-40Hardware feature descriptions

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 3-6for 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

 

Plenum

 

Plastic

Retaining

baffle

screws

 

 

Front view

 

Attaching screw (2)

OPTera Metro 3500 Multiservice Platform NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004

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Nortel Networks NTRN10AN manual OPTera Metro 3500 Cooling unit assembly NTN458QA