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3 Board
Figure 3-38 TES functional structure
Power Supply Module
The power supply module of the TES consists of the DC/DC conversion circuit and the
DC/AC conversion circuit:
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Communication Module
The communication module realizes the communication between the TES and the TMU, and
the communication between the TES and the TEU. It also obtains the PCB version number of
the TES and the cabinet number.
The serial port communication between the TES and the TMU conforms to the RS485
standard. It is connected to CBUS3 of the TMU. The TES is connected to CBUS3 through the
level conversion circuit. The parallel communication mode between the TES and the TEU
adopts P2P mode. The parallel level is TTL.
3.18.3 Panel
Figure 3-39
3-56
TES
1st +5 V DC Output
Power Supply
2nd +5 V DC Output
Module
-5 V DC Output
75 V AC Ringing Current Output
Communication
Module
The DC/DC conversion circuit converts the +24 V DC to 2 channels of +5 V DC power
and 1 channel of –5 V DC power.
The DC/AC conversion circuit converts the +24 V DC power to 1 channel of 75 V AC
ringing signal.
shows the TES panel.
Huawei Technologies Proprietary
M900/M1800 BTS3X Series Base Transceiver Station
+24 V DC Input
For first
TEU
For second TEU
For both TEUs
For both TEUs
To TMU communication serial port
To TEU communication serial port
Hardware Description Manual
Issue 01 (2006-11-18)
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