4 BTS3012AE Double-Transceiver SubsystemAbout This Chapter

The BTS3012AE uses the DTRU subrack to perform the functions of the double-transceiversubsystem. These functions include the signal modulation and demodulation, poweramplification, and combination output.

4.1 Components of the BTS3012/BTS3012AE Double-Transceiver SubsystemThe functions of the BTS3012/BTS3012AE double-transceiver subsystem are performed by theDTRUs, which are located in the DTRU subrack.4.2 Functions of the BTS3012/BTS3012AE Double-Transceiver SubsystemThe BTS3012/BTS3012AE double-transceiver subsystem transmits RF signals, receives RFsignals, and processes baseband signals.

BTS3012AEProduct Description(for DCU) 4 BTS3012AE Double-Transceiver Subsystem

Issue 01 (2007-09-10) Huawei Technologies Proprietary 4-1

4.1 Components of the BTS3012/BTS3012AE Double-Transceiver Subsystem

The functions of the BTS3012/BTS3012AE double-transceiver subsystem are performed by theDTRUs, which are located in the DTRU subrack.

Internal CompositionFigure 4-1 shows a fully configured BTS3012/BTS3012AE DTRU subrack.

Figure 4-1 Fully configured DTRU subrack

DTRU

DTRU

DTRU

0 1 2 3 4 5

DTRU

DTRU

DTRU

External CablingFigure 4-2 shows the external cabling of the BTS3012/BTS3012AE DTRU subrack.

Figure 4-2 External cabling of the BTS3012/BTS3012AE DTRU subrack

DTRU

DTRB

RF RX signal cable

Signal cable betweenDCSU and DTRB

DTRU subrackRF TX signal cable

NOTE

The DTRB is the backplane in the DTRU subrack.

4.2 Functions of the BTS3012/BTS3012AE Double-Transceiver Subsystem

The BTS3012/BTS3012AE double-transceiver subsystem transmits RF signals, receives RFsignals, and processes baseband signals.The transmitting part of the RF signals performs the following operations:

4 BTS3012AE Double-Transceiver SubsystemBTS3012AE

Product Description(for DCU)

4-2 Huawei Technologies Proprietary Issue 01 (2007-09-10)

l Converting the baseband signals into RF signals through the modulation, up-frequencyconversion, filtering, and RF frequency hopping

l Amplifying signals and outputting combined signalsThe receiving part of RF signals performs the following operations:l Demodulating the RF signals and performing frequency hopping of RF signalsl Dividing the received RF signals and performing receive diversityThe baseband processing part performs the following operations:l Signaling processing such as encoding, decoding, interleaving, de-interleaving,

modulating, and demodulating channelsl Supporting voice and fax servicesl Supporting Phase II data services, GPRS services, and EDGE servicesl Supporting RF loop test and switchover when loop test of phase-lock fails

BTS3012AEProduct Description(for DCU) 4 BTS3012AE Double-Transceiver Subsystem

Issue 01 (2007-09-10) Huawei Technologies Proprietary 4-3

4 BTS3012AE Double-Transceiver Subsystem4.1 Components of the BTS3012/BTS3012AE Double-Transceiver Subsystem4.2 Functions of the BTS3012/BTS3012AE Double-Transceiver Subsystem