ASC

Technical Product Description, ASC DESCRIPTION

Copyright © Ericsson 2006 – All Rights Reserved Disclaimer No part of this document may be reproduced in any form without the written permission of the copyright owner. The contents of this document are subject to revision without notice due to continued progress in methodology, design and manufacturing. Ericsson shall have no liability for any error or damage of any kind resulting from the use of this document.

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Technical Product Description, ASC

Contents 1

Product Overview

1

1.1

Main Functions

2

1.2

Variants

3

2

Dimensions

3

3

Power Consumption

3

4

Function Description

4

5

Interfaces

5

5.1

Signal and Power Interfaces

6

6

Standards, Regulations and Dependability

6

6.1

Safety Standards

6

6.2

Other Standards and Regulations

7

7

Revision History

7

7.1

Rev B to C

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Technical Product Description, ASC

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Technical Product Description, ASC

1

Product Overview This document describes the Antenna System Controller (ASC) which is an auxiliary unit for the WCDMA antenna system. Different variants of the ASC are described in this document. The figure below shows the two main types of ASC, the leftmost shows KRY 112 42/2 and KRY 112 42/3 and the rightmost shows KRY 112 42/4, KRY 112 132/1, and KRY 112 134/1.

P015656B

Figure 1

ASC Overview

The ASC consists of two dual duplex Tower Mounted Amplifiers (ddTMA) units for support of two antenna branches and control circuits for an optional Remote Electrical Tilt Unit (RETU). Each ddTMA unit supports one antenna array in a cross-polarized antenna, and is connected to one single TX/RX feeder. The ASC has two antenna ports, two RBS ports, and one RETU port. It can be installed in an upright position on a pole or a flat surface.

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Technical Product Description, ASC

Antenna

Antenna

RETU

ASC

RETU

ASC

P015571A

Figure 2

1.1

Typical Installation of ASC

Main Functions The main functions of the ASC are the following:

2

•

Amplifies RX-signals to compensate for feeder loss

•

Increases uplink coverage

•

Supervises antenna

•

Supplies power to an external unit, such as the RETU

•

Controls an external unit

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Technical Product Description, ASC

1.2

Variants The following ASC variants exist: Table 1

2

ASC Variants

Product Number

3GPP Frequency Band

KRY 112 42/2 KRY 112 42/3 KRY 112 42/4

I

KRY 112 132/1

III, IX

KRY 112 134/1

IV

Dimensions This section describes the size and weight of the ASC. Table 2

3

Size and Weight

Product No.

Height

Width

Depth

Weight

KRY 112 42/2 KRY 112 42/3

312 mm

160 mm

83 mm

5 kg

KRY 112 42/4 KRY 112 132/1 KRY 112 134/1

333 mm

201 mm

97 mm

4.55 kg

Power Consumption The maximum power consumption is 12 W, excluding the RETU.

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Technical Product Description, ASC

4

Function Description This section describes the function of the ASC.

Ant A RBS

Bias-T

DPX

LNA

DPX Ant Sup

Contr

R E T

DC/DC Ant Sup

Ant B RBS

Bias-T

DPX

LNA

DPX

P010641A

Figure 3

ASC block diagram

The ASC consists of the following functional blocks: •

Bias-T

•

Duplex filter (DPX)

•

Low Noise Amplifier (LNA)

•

DC Supply (DC/DC)

•

Antenna Supervision (Ant Sup)

•

Control and Communication Circuits (Contr)

Bias-T The Bias-T separates DC power and control signals from radio frequency signals in the feeder from the RBS. It feeds the DC power to the DC Supply and the control signals to the Control and Communication Circuits. The radio frequency signals are fed to the Duplex Filter.

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Technical Product Description, ASC

Duplex Filter The two Duplex Filters separates the RX and TX signals. RX signals are fed from the antenna to the Low Noise Amplifier and TX signals from the RBS are bypassed to the Duplex Filter at the other end of the signalling path. Low Noise Amplifier The Low Noise Amplifier amplifies the RX signal. The amplification of the Low Noise Amplifier is adjustable by software settings in the Control and Communication Circuits to compensate for variable feeder length. DC Supply The DC Supply converts the voltage supplied via the feeders to necessary internal voltages. Power to external equipment (RETU) is also provided. Power is fed to the DC Supply through feeder A, feeder B or both. Antenna Supervision The antenna is supervised by a directional coupler which monitors Voltage Standing Wave Ratio (VSWR) and forward power. This information is sent to the RBS. Control and Communication Circuits The Control and Communication Circuits convert the Frequency Shift Keying (FSK) signalling on the feeders to RS 485 or from RS 485 to FSK. They also control Low Noise Amplifier and RETU and supervise the antennas.

5

Interfaces The table below shows the external interfaces of the ASC. Table 3

External Interfaces

Description

ASC

Qty

Connector

Marking

Connection to the RBS

KRY 112 42/2 KRY 112 42/3

2

Female 7–16 connector

RX/TX A RX/TX B

KRY 112 42/4 KRY 112 132/1 KRY 112 134/1

2

Female 7–16 connector

RBS A RBS B

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Technical Product Description, ASC

5.1

Description

ASC

Qty

Connector

Marking

Connection to the antenna

Common

2

Female 7–16 connector

ANT A ANT B

Connection to the RETU

KRY 112 42/2 KRY 112 42/3

1

Female 8–pin DIN 45326

AUX

KRY 112 42/4 KRY 112 132/1 KRY 112 134/1

1

4–pin M12

RET

Signal and Power Interfaces Table 4

Nominal voltage

+30 V DC

Voltage range

+24 to +32 V DC

Non-destruction voltage

±0 V DC to +24 V DC and +32 V DC to +36 V DC

Allowed voltage ripple

120 mV peak-to-peak (0.15 MHz to 30 MHz)

Polarity

Feeder inner conductor = positive Feeder outer conductor = negative

Table 5

6

Supply voltage

Signal Interfaces

RETU signal interface

RS 485

Feeder signal communication

Frequency Shift Keying

Standards, Regulations and Dependability In this section a brief overview over standards, type approval and electromagnetic compatibility are stated.

6.1

Safety Standards In accordance to the market requirements, the ASC complies with the following product safety standards:

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Technical Product Description, ASC

6.2

•

73/23/EEC Low voltage directive

•

IP 65 according to IEC 529/NEMA 3R

•

EN 60950-1 / IEC 60950-1 / IEC 60 950:1999

Other Standards and Regulations Marking The product is marked with signs to show compliance with product safety standards. Type Approval Standards The ASC complies with the European Community requirements regarding radio performance. The product has the CE sign to show compliance to the legal requirements. Electromagnetic Compatibility (EMC) The ASC complies with the European Community requirements regarding EMC. The product has the CE sign to show compliance to the legal requirements. Dependability The Mean Time Between Failure (MTBF) for the ASC is more than 30 years.

7

Revision History Apart from editorial changes, this document has been revised as follows:

7.1

Rev B to C •

KRY 112 132/1 and KRY 112 134/1 added

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