01-04 Bts3012 Double-transceiver Subsystem

BTS3012 Product Description(for 18TRX)

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4 BTS3012 Double-Transceiver Subsystem

BTS3012 Double-Transceiver Subsystem

About This Chapter The BTS3012 uses the DTRU subrack to perform the functions of the double-transceiver subsystem. These functions include the signal modulation and demodulation, power amplification, and combination output. 4.1 Components of the BTS3012 Double-Transceiver Subsystem (for 18 TRXs) The functions of the BTS3012 double-transceiver subsystem are performed by the DTRUs, which are located in the DTRU subrack. 4.2 Functions of the BTS3012 Double-Transceiver Subsystem (for 18 TRXs) The BTS3012/BTS3012AE double-transceiver subsystem transmits RF signals, receives RF signals, and processes baseband signals.

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BTS3012 Product Description(for 18TRX)

4 BTS3012 Double-Transceiver Subsystem

4.1 Components of the BTS3012 Double-Transceiver Subsystem (for 18 TRXs) The functions of the BTS3012 double-transceiver subsystem are performed by the DTRUs, which are located in the DTRU subrack.

Internal Composition Figure 4-1 shows fully configured BTS3012 DTRU subracks. Figure 4-1 Fully configured DTRU subracks

D T R U

D T R U

D T R U

0

1

2

D T R U

D T R U

3

4

D T R U

5

DTRU subrack1

D T R U

D T R U

D T R U

6

7

8

DTRU subrack0

External Cabling Figure 4-2 shows the external cabling of the BTS3012 DTRU subrack.

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BTS3012 Product Description(for 18TRX)

4 BTS3012 Double-Transceiver Subsystem

Figure 4-2 External cabling of the BTS3012 DTRU subrack DTRU subrack 1 RF RX signal cable Signal cable between DCSU and DTRB

DTRU

DTRB

RF TX signal cable Baseband FH signal cable between the DCSU and the DTRB

DTRU subrack 0 RF RX signal cable

DTRU

RF TX signal cable

NOTE

The DTRB is the backplane in the DTRU subrack.

4.2 Functions of the BTS3012 Double-Transceiver Subsystem (for 18 TRXs) The BTS3012/BTS3012AE double-transceiver subsystem transmits RF signals, receives RF signals, and processes baseband signals. The transmitting part of the RF signals performs the following operations: l

Modulating the baseband signals into RF signals, and performing up-frequency conversion, filtering, and frequency hopping

l

Amplifying and outputting the RF signals

The receiving part of the RF signals performs the following operations: l

Demodulating the RF signals into baseband signals, and performing frequency hopping

l

Dividing the received RF signals and performing receive diversity

The baseband processing part performs the following operations: l

Processes signaling, coding and decoding, interleaving and de-interleaving, modulation and demodulation, and frequency hopping of baseband signals

l

Supports voice and fax services

l

Supports Phase II data services, GPRS services, and EDGE services

l

Supports RF loop test and switchover when loop test of phase-lock fails

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