Installation

Fan Module Installation

For installations where the ambient temperature is likely to be near the upper limit of the acceptable range (see Table 3-1), a fan module must be added to the carrier to provide forced air cooling.

Preinstallation Inspection

Check the unit for physical damage, such as broken blades. Spin fan blades manually to test for damage. If the fan module shows signs of damage, report this immediately to your shipping representative and also to your AT&T Paradyne representative. Otherwise, install the fan module.

Installation

The optional fan module is connected to the power transformer unit; therefore, this procedure assumes the power transformer unit has been installed.

To install the fan module:

.Procedure

1.If the fan module is being installed after the carrier has been installed, loosen the four captive screws (see Figure 3-10) that attach the cover plate to the carrier and remove the cover plate. If an SDCP is not being installed, set the cover plate aside for reinstallation after the fan module has been installed.

Table 3-1

Fan Module Cooling Requirements

Ambient

 

Circuit Card

 

Number of Carriers

 

Temperature

 

 

 

 

Configuration1

1 ± 2

3

4

5 ± 6

Range

 

 

 

 

 

 

 

 

 

 

 

 

DSUs without

 

No Fan Modules

 

1 fan module

 

 

DBMs and Model

 

 

(place in second

 

 

3151 CSUs

 

 

 

carrier from top)

 

 

 

 

 

 

 

39_± 86_F

 

DSUs with DBM,

No fan modules

1 fan module

2 fan modules

 

(4_± 30_C)

 

and Model 3811

 

(place in middle

(place in bottom

 

 

 

and 3911 dial/

 

carrier)

carrier and

1 fan module

 

 

lease modems 2

 

 

second from top)

 

 

 

 

per carrier

 

 

 

 

 

 

 

 

Model 3161 DSU/

1 fan module per carrier or 1 fan module

 

 

 

CSUs 2

per two carriers (placed in upper carrier)

 

86_± 122_F

 

Model 3161 DSU/

 

1 fan module per carrier

 

(30_± 50_C)

 

CSUs 2

(Limit of 3 carriers in a cabinet at temperatures above 40_C or 104_F) 3

1 Installing the TDM or MCMP option has no effect on this table.

 

 

2 Use the strictest cooling requirements when there is a mixture of units installed.

 

3 Allow 1.75

(IU) spacing between carriers if more than 3 carriers are required.

 

3000-A2-GA31-80

December 1994

3-15

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Paradyne 3000 manual Fan Module Installation, Configuration1 Range