User Manual

ADCP-75-159 • Issue 1 • August 2003 • Section 2: Description
Page 2-18
© 2003, ADC Telecommunications, Inc.
5.8 Powering
The STM is powered by 120 or 240 VAC (50 or 60 Hz) power which is supplied through a
three-conductor AC power cord. The power cord is provided with the RU outdoor cabinet or
indoor mounting shelf. The power cord connects to an AC connector mounted on the STM front
panel. A switch on the STM front panel provides AC power On/Off control.
5.9 Cooling
Continuous air-flow for cooling is provided by a single fan mounted on the rear side of the STM
housing. An alarm is provided that indicates if a high temperature condition (>50º C/122º F)
occurs. If the temperature falls below 32º F (0º C), the fan automatically shuts off. The fan may
be field replaced if it fails.
5.10 User Interface
The STM user interface consists of the various connectors, switches, and LEDs that are
provided on the STM front panel. The STM user interface points are described in Table 2-4 and
shown in Figure 2-8.
Table 2-4. Spectrum Transport Module User Interface
REF
NO
USER INTERFACE
DESIGNATION
DEVICE
FUNCTIONAL
DESCRIPTION
1 PORT 1 SC connector
(single-mode)
Input connection point for the forward path opti-
cal fiber.
2 PORT 2 SC connector
(single-mode)
Output connection point for the reverse path pri-
mary optical fiber.
3 I/0 On/Off rocker
switch
Provides AC power on/off control.
4 No designation 3-wire AC power
cord connector
Connection point for the AC power cord.
5 No designation 2- wire DC power
cord connector
Connection point for a back-up battery power
cord. (Not used with 20 Watt system)
6 SERVICE DB-9 connector
(female)
Connection point for the RS-232 service inter-
face cable.
7 AC POWER Multi-colored LED
(green/red)
Indicates if the STM is powered by the AC power
source (green) or the back-up battery system
(red). See Note.
8 STANDBY Multi-colored LED
(green/yellow/red)
Indicates if the system is in the Normal state (off)
Standby state (blinking green), Test state (blink-
ing red), or Program Load state (blinking yel-
low). See Note.
9 HOST UNIT Multi-colored LED
(green/yellow/red)
Indicates if no alarm (green), a minor alarm (yel-
low), or a major alarm (red) is reported by the
HU. See Note.