Atec Anritsu-MT8221B - Manual (Page 9)

9
BTS Master™ Base Station Analyzer Features
Introduction to Signal Analyzers
Signal Analyzers
LTE
GSM/GPRS/EDGE
W-CDMA/HSDPA
cdmaOne/CDMA2000 1X
CDMA2000 1xEV-DO
Fixed WiMAX
Mobile WiMAX
TD-SCDMA
Typical Signal Analyzer Options
RF Measurements
Demodulation
Over-the-Air Measurements
Signal Analyzer Features
Measurement Summary Displays
Pass/Fail Limit Testing
Signal Analyzers
The BTS Master features Signal Analyzers
for the major wireless standards around
the world. The Signal Analyzers are
designed to test and verify the:
• RF Quality
• Modulation Quality
• Downlink Coverage Quality
of the base stations’ transmitters. The
goal of these tests are to improve the Key
Performance Indicators (KPIs) associated
with:
• Call Drop Rate
• Call Block Rate
• Call Denial Rate
By understanding which test to perform
on the BTS Master when the KPIs
degrade to an unacceptable level, a
technician can troubleshoot down to
the Field Replacement Unit (FRU) in the
base station’s transmitter chain. This
will minimize the problem of costly no
trouble founds (NTF) associated with card
swapping. This will allow you to have a
lower inventory of spare parts as they are
used more efficiently.
Troubleshooting Guides
The screen shots on this page are all
measurements made over-the-air with
the MT822xB on commercial base stations
carrying live traffic. To understand
when, where, how, and why you make
these measurements Anritsu publishes
Troubleshooting Guides which explain for
each measurement the:
• Guidelines for a good measurement
• Consequences of a poor
measurement
• Common faults in a base station
These Troubleshooting Guides for Base
Stations are one-page each per Signal
Analyzer. They are printed on tear-
resistant and smudge-resistant paper
and are designed to fit in the soft case of
the instrument for easy reference in the
field. They are complimentary and their
part numbers can be found in the
ordering information.
• LTE Base Stations
• GSM/GPRS/EDGE Base Stations
• W-CDMA/HSDPA Base Stations
• CDMA2000 1X Base Stations
• CDMA2000 1xEV-DO Base Stations
• Fixed WiMAX Base Stations
• Mobile WiMAX Base Stations
• TD-SCDMA/HSDPA Base Station
RF Measurement – GSM
High Frequency Error will cause calls to drop when
mobiles travel at higher speed. In some cases, cell
phones cannot hand off into, or out of the cell.
Demodulation – HSDPA
This is the single most important signal quality
measurement. Poor EVM leads to dropped calls, low
data rate, low sector capacity, and blocked calls.
Over-the- Air Measurement - CDMA
Having low multi-path and high pilot dominance is
required for quality Rho measurements OTA. Poor Rho
leads to dropped and blocked calls, and low data rate.
Measurement Summary – LTE
Having a summary of all key measurements is a quick
way for a technician to see the health of the base
station and record the measurements for reference.