User's Manual

ADCP-75-158 • Issue 1 • July 2003 • Section 2: Description
Page 2-6
© 2003, ADC Telecommunications, Inc.
2.11 Cooling
Continuous airflow for cooling is provided by dual fans mounted on the right side of the HU
housing. A minimum of 3 inches (76 mm) of clearance space must be provided on both the left
and right sides of the HU for air intake and exhaust. An alarm is provided if a high temperature
condition (>50º C/122º F) occurs. The fans may be field-replaced if either fan fails.
2.12 User Interface
The HU user interface consists of the various connectors, switches, terminals, and LEDs that are
provided on the HU front and rear panels. The user interface points are indicated in Figure 2-2
and described in Table 2-1.
Figure 2-2. Host Unit User Interface
Table 2-1. Host Unit User Interface
REF
NO
USER INTERFACE
DESIGNATION
DEVICE
FUNCTIONAL
DESCRIPTION
1 I/0 On/Off rocker
switch
Provides DC power on/off control.
2 PORT 1 SC connector
(single-mode)
Output connection point for the forward path
optical fiber.
3 PORT 2 SC connector
(single-mode)
Input connection point for the reverse path pri-
mary optical fiber.
4 POWER Multi-colored LED
(green/yellow)
Indicates if the HU is powered (green) or unpow-
ered (off). See Note.
5 STANDBY Multi-colored LED
(green/yellow/red)
Indicates if the system is in the Normal (off),
Standby (blinking green), Test (blinking red), or
Program Load (blinking yellow) state. See Note.
6 HOST UNIT Multi-colored LED
(green/yellow/red)
Indicates if the HU is normal (green), overheated
(yellow), or faulty (red). See Note.
(1) DC POWER 
ON/OFF SWITCH
NOTE: SHOWN WITHOUT 
CABLE MANAGEMENT TRAY
(2) 
PORT 1
(3) 
PORT 2
(REFERENCE 
ITEMS 4 - 9) 
LED INDICATORS
(10) SERVICE 
INTERFACE 
CONNECTOR
(11) NET IN 
CONNECTOR
(12) NET OUT 
CONNECTOR
(13) ALARM 
OUTPUT 
CONNECTOR
(14) REVERSE 
RF OUT
(15) FORWARD

RF IN
18532-A