Function
The GATM has the following functions:
l Controls the RET antenna.
l Supplies power to the TMA.
l Reports the RET control signal alarms.
l Monitors the current from the feeder.
NOTE
The GATM cannot support the TMA and RET antenna simultaneously.
LED
On the GATM there are three LEDs, which indicate the operating status of the GATM. Table
4-59 describes the LEDs on the GATM.
Table 4-59 LEDs on the GATM
LED
Color Status Description
RUN Green ON for 2s and OFF for 2s The power supply is normal, but the
communication with the BBU incurs
faults.
ON for 1s and OFF for 1s The module is functional and
communicates with the BBU
properly.
OFF There is no power supply, or the
module is faulty.
ACT Green ON The AISG link is available.
OFF The AISG link is unavailable.
Blinking irregularly The AISG link is in transmission
state.
ALM Red ON An alarm is generated, such as an
overcurrent alarm.
OFF The module is functional.
Port ID
There are eight ports on the GATM, of which six are used to supply power to the TMA or transmit
the RET control signals, one is used to connect the GATM to the BBU, and one is used as an
extended RS485 port. In addition, there is also a -48 V DC power supply socket. Table 4-60
describes the ports and socket on the GATM.
4 BTS3900 Components
BTS3900
Hardware Description
4-64 Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Issue 04 (2011-02-15)
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