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User Manual
Airbridge cBTS3612 CDMA Base Station
Public parameter measurement: BTRM makes a regular measurement of the
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forward transmit power and Received Signal Strength Indication (RSS I), and
reports the measurement result to BCKM.
Loopback test: BTRM software receives loopback test command from the main
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control software and returns the test data. This function is used for testing the
logic link between BTRM and BCKM.
Transmit path gain compensation: BTRM software modifies the gain of the
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transmit path according to the change of ambient temperature and the present
working frequency, to ensure the stability of transmit power at antenna & feeder
port.
2) Software phase-lock
BTRM software phase-lock unit controls the thermostatic crystal oscillator with
software phase-locking algorithm so that the crystal oscillator can provide a clock
with satisfactory frequency and precision to the system.
3) Others
This part consists of 2 functional sub -modules:
Optical fiber delay calculation: when the optical fiber is long, the delay of optical
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link becomes significant. BTRM software can calculate the delay of the optical
link and reports the result to OMU so that OMU can make necessary phase
compensation.
BFMM and environment monitor box management: BTRM software exercises
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management over the BFMM and environment monitor box, including storing &
sending alarm information, sending control command and acquiring real-time
status.
4) Operation & maintenance
Public part: process messages related to OMU interface such as log
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management, board self-check, public query, interface tracing, board software
loading, link test, and related functions.
Private part: control the parameter configuration and operation status of RF
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system, monitor RF PLL status, and perform functions such as alarm collection,
alarm processing and reporting.
3-11
System Description
3 Software Architecture
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