Справочник Пользователя для ADC Telecommunications Inc. DVICSRIU800
ADCP-75-114 • Issue C • June 2001
Page 17
©
2001, ADC Telecommunications, Inc.
3 OPERATION
This
section provides guidelines for turning-up the RIU, verifying that the RIU is operating
properly,
setting the forward and reverse path signal levels, and correcting any installation
problems.
3.1 Tools and Materials
The
following tools and materials are required in order to complete the procedures in this section:
•
Portable
spectrum analyzer or network analyzer
•
Pencil
or pen
•
Writing
pad
3.2 Turn-Up Unit and Verify Operation
The
process of turning-up the RIU and verifying operation involves setting the forward and
reverse
path signal levels, turning on the power, verifying that the LED indicator shows normal
operation,
and then measuring the forward and reverse path signal levels. Refer to Table 3 for a
detailed
description of the ALARM LED indicator.
Table 3. Remote Interface Unit LED Indicator
INDICATOR
COLOR
DESCRIPTION
ALARM
Green
Yellow
Red
Off
Indicates
if the RIU is normal or if a fault is detected.
RIU
in normal state, no faults detected.
High
temperature fault detected. (Minor alarm)
Over
or undercurrent fault on power amplifier detected. (Major alarm)
AC
power off or RIU internal fault.
Use
the following procedure to power-up the system:
1. Temporarily disconnect the alarm system or notify the alarm system provider that testing
is
in progress.
2. Adjust the forward and reverse path signal levels as specified in sections 3.3 and 3.4.
3. Verify that the donor antenna is properly installed and connected.
3. Verify that the donor antenna is properly installed and connected.
Note: To comply with Maximum Permissible Exposure (MPE) requirements, antennas must be
installed
to provide at least 20 centimeters (8 inches) of separation from all persons per FCC
47
CFR part 2.1091.
4. Verify that the RIU is connected to the appropriate AC outlet.
5. Place the ON/OFF switch on the RIU in the ON position (press I).
6. Verify that the ALARM LED on the RIU turns green.
7. Check the forward path RF signal level at the DHU RF IN port and verify that the DHU
5. Place the ON/OFF switch on the RIU in the ON position (press I).
6. Verify that the ALARM LED on the RIU turns green.
7. Check the forward path RF signal level at the DHU RF IN port and verify that the DHU
input
signal level is –20 dBm. Re-adjust FWD LEVEL ADJ rotary switches to add or
remove
gain if required.