User's Manual

APEX 1900-24 USER MANUAL V1.0.00 Tech Support: 1-888-317-8766
4
Glossary
The following is a list of abbreviations and terms used in this manual.
Abbreviation Definition
AC Alternating Current
ANT Antenna
ATT Attenuator / Attenuation
CDMA Code Division Multiple Access
DC Direct Current
DL Downlink
GND Grounding
GUI Graphic User Interface
LED Light Emitting Diode
PLL Phase-locked loop
PSU Power Supply Unit
RF Radio Frequency
RSSI Received Signal Strength Indication
TEMP Temperature
UL Uplink
VSWR Voltage Standing Wave Ratio
AGC (Automatic Gain Control)
AGC feature prevents the repeater from exceeding its maximum output power by reducing the gain
automatically. AGC is used to adjust the gain to an appropriate level for a range of input signal
levels
.
ASD (Automatic Shutdown)
ASD does not:
1. prevent oscillation
2. protect from excessive input.
ASD helps protect the amplifier from over load. ASD helps protect the network by preventing
excessive signal output power.
There are three parameters: ASD Level, ASD Time, and ASD Iteration.
If the output power exceeds higher than the “ASD LEVEL”, the repeater will shut down for “ASD
TIME” seconds and it will turn the amp back on to measure the output power again. If this repeats at
“Iteration” times, the repeater will shut down completely.
1. Introduction
APEX1900-24 is used to fill out areas in APEX1900-24 systems, such as base station fringe areas,
business and industrial building, etc.
APEX1900-24 receives signals from a base station, amplifies and retransmits the signals to the
mobile stations. It also receives, amplifies and retransmits signals in the opposite direction. Both
directions are served simultaneously with the following features: