User Manual

ADCP-75-159 • Issue 1 • August 2003 • Section 2: Description

Page 2-11

3.8 Ventilation

Vent openings are provided in the bottom of the RU cabinet to permit air exchange for cooling.

Air enters the cabinet through an opening in the front/bottom side of the cabinet A Filter

removes dirt particles so that only clean air enters the enclosure. Both the STM and LPA have

cooling fans. The STM has a rear mounted fan that pulls air through the module and exhausts it

toward the rear of the enclosure. The LPA has a fan on the front that draws air into the module

and exhausts it toward the rear of the enclosure. The heated air exits through an opening in the

rear/bottom side of the enclosure.

3.9 User Interface

The RU cabinet user interface consists of the various connectors, fittings, mounting slots, and

switches that are provided on both the interior and exterior of the enclosure. The user interface

points are described in Table 2-2 and indicated in Figure 2-4.

Table 2-2. Remote Unit Cabinet User Interface

REF

DEVICE FUNCTIONAL DESCRIPTION

1 Air inlet filter Reusable filter that prevents the entry of dirt particles when out-

side air is pulled into the cabinet for cooling.

2 AC power cord Provides AC power to the STM.

3 Door switch Indicates to the fault detection and alarm reporting system if the

cabinet door is open (major alarm) or closed.

4 LPA mounting slot Provides a mounting point for the LPA module.

5 STM mounting slot Provides a mounting point for the STM module.

6 WDM/CWDM mounting

slot

Provides a mounting point for either the WDM or CWDM mod-

ule.

7 CWDM power cord Provides DC power to the CWDM module.

8 Fiber slack spools Provide a storage place for excess fiber pigtail and patch cord

slack.

9 Lightning protector Provides lightning surge protection for the antenna connection.

10 Fiber cable connector Provides both an entry point and strain relief for the fiber optic

cable.

11 3/4-inch NPT threaded hole Provides a connection point for a 3/4-inch AC conduit fitting.

12 Grounding lug Provides a connection point for an external grounding cable.