01-05 Bts3012 Rf Front-end Subsystem

BTS3012 Product Description(for 18TRX)

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5 BTS3012 RF Front-End Subsystem

BTS3012 RF Front-End Subsystem

About This Chapter The functions of the BTS3012 RF front-end subsystem are performed by the boards in the DAFU subrack. 5.1 Components of the BTS3012/BTS3012AE RF Front-End Subsystem The functions of the BTS3012/BTS3012AE RF front-end subsystem are performed through the boards in the DAFU subrack. The DAFU subrack can be configured with the DDPU, DCOM, DFCU, DFCB, or the combination of these modules. 5.2 Functions of the BTS3012/BTS3012AE RF Front-End Subsystem The BTS3012/BTS3012AE RF front-end subsystem duplexes the received and transmitted signals, combines the signals for transmission, divides received signals, and amplifies the low noise of the received signals.

Issue 02 (2007-08-15)

Huawei Technologies Proprietary

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BTS3012 Product Description(for 18TRX)

5 BTS3012 RF Front-End Subsystem

5.1 Components of the BTS3012/BTS3012AE RF Front-End Subsystem The functions of the BTS3012/BTS3012AE RF front-end subsystem are performed through the boards in the DAFU subrack. The DAFU subrack can be configured with the DDPU, DCOM, DFCU, DFCB, or the combination of these modules.

Internal Composition Part A in Figure 5-1 shows the DAFU subrack configured with the DDPU and part B in Figure 5-1 shows the DAFU subrack configured with the DFCU. Figure 5-1 Fully configured DAFU subrack

D D P U

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D D P U

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D D P U

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A

D F C U

D F C U

D F C U

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B

NOTE

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A maximum of six DDPUs can be configured in the DAFU subrack. The DCOM is used with the DDPU only when a cell is configured with more than four TRXs.

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At present, the DFCU is applied only over EGSM 900 M frequency band. It is used only in S4/4/4 or higher cell configuration.

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If the DAFU subrack is only configured with the DFCU, up to three DFCUs can be configured. The DFCB is cascaded only with the DFCU during the expansion of the DFCU, enabling the six-in-one function.

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The DDPU and the DFCU can be configured in the same subrack.

Huawei Technologies Proprietary

Issue 02 (2007-08-15)

BTS3012 Product Description(for 18TRX)

5 BTS3012 RF Front-End Subsystem

External Cabling Figure 5-2 shows the external cabling of the BTS3012/BTS3012AE DAFU subrack. Figure 5-2 External cabling of the BTS3012/BTS3012AE DAFU subrack DAFU subrack

RF Rx signal cable Signal cables between the DCTB and the DAFU subrack

DDPU/DFCU/DFCB

RF Tx signal cable RF jumper

5.2 Functions of the BTS3012/BTS3012AE RF Front-End Subsystem The BTS3012/BTS3012AE RF front-end subsystem duplexes the received and transmitted signals, combines the signals for transmission, divides received signals, and amplifies the low noise of the received signals. The RF front-end subsystem performs the following functions: l

Combining multiple routes of RF TX signals for transmission

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Transmitting and receiving signals through a duplexer

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Detecting and reporting antenna Voltage Standing Wave Ratio (VSWR) alarms and low noise amplification alarms

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Controlling the low noise amplification gain

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Detecting and reporting the transmit power on the antenna ports

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Detecting and reporting the temperature of the boards

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Detecting whether a board is in position

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Supporting online software upgrade

Issue 02 (2007-08-15)

Huawei Technologies Proprietary

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