Installation
Fan Module Installation
For installations where the ambient temperature is likely to be near the upper limit of the acceptable range (see Table
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
Table
Fan Module Cooling Requirements
Ambient |
| Circuit Card |
| Number of Carriers |
| ||
Temperature |
|
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|
| |||
Configuration1 | 1 ± 2 | 3 | 4 | 5 ± 6 | |||
Range |
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|
|
| |
|
| 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. |
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2 Use the strictest cooling requirements when there is a mixture of units installed. |
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3 Allow 1.75″ | (IU) spacing between carriers if more than 3 carriers are required. |
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December 1994 |
