User Manual

ADCP-75-179 • Preliminary Issue A • September 2004 • Section 2: Description
Page 2-6
© 2004, ADC Telecommunications, Inc.
2.11 Powering
The HU is powered by ± 21 to ± 60 VDC power (nominal ± 24 or ± 48 VDC). The power is fed to
the HU through a screw-down type terminal strip located on the rear side of the unit. Power to
the HU must be supplied through a fuse panel such as the PowerWorx GMT Series Fuse Panel
(available separately). The power circuit for each HU must be protected with a 3 Amp GMT
fuse. An On/Off switch is provided on the HU front panel.
2.12 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 generated if a high temperature
condition (>50º C/122º F) occurs. The fans may be field-replaced if either fan fails.
2.13 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 HU user interface points are indicated in
Figure 2-2 and described in Table 2-1.
Figure 2-2. Typical Host Unit User Interface
(1) DC POWER
ON/OFF SWITCH
(21)
REV
(20)
FWD
(REFERENCE
ITEMS 2 - 8)
LED INDICATORS
(9) SERVICE
INTERFACE
CONNECTOR
(11) NET IN
CONNECTOR
(10) AUXILIARY
CONNECTOR
(12) NET OUT
CONNECTOR
(19) ALARM
OUTPUT CONNECTOR
(13) 806-824
REVERSE
(15) 851-869
FORWARD
(16) 935-940
FORWARD
(14) 896-901
REVERSE
20021-A
(17) DC POWER
TERMINAL STRIP
REAR VIEW
FRONT VIEW
(18) COVER PLATE
(22)
GROUNDING
STUD