Exhibit 8 Manual
Ericssonwide Internal DESCRIPTION Prepared (also subject responsible if other) 1( 8 ) No. / XSNSIXI 8/1551-LZA 701 0001 Uen Approved Checked CBC/XRX/M (Kai Lian) Date Rev 2011-05-05 C Reference dTRU Unit Description Copyright © Ericsson AB 2006, 2010, 2011. All rights reserved. No part of this document may be reproduced in any form without the written permission of the copyright owner.
Ericssonwide Internal DESCRIPTION Prepared (also subject responsible if other) 2( 8 ) No. / XSNSIXI 8/1551-LZA 701 0001 Uen Approved Checked CBC/XRX/M (Kai Lian) 1 Date Rev 2011-05-05 C Reference dTRU Unit Description The double Transceiver Unit (dTRU) is a 2-TRX replaceable unit. A TRX is a transmitter/receiver and signal-processing unit, which transmits and receives one carrier. Figure 1 1.1 dTRU and dTRU EDGE Product Overview The dTRU is a 2-TRX replaceable unit.
Ericssonwide Internal DESCRIPTION Prepared (also subject responsible if other) 3( 8 ) No. / XSNSIXI 8/1551-LZA 701 0001 Uen Approved Checked CBC/XRX/M (Kai Lian) Date Rev 2011-05-05 C Reference versions of dTRU EDGE have limitations on VAMOS. For details, please refer to document BTS Parameter Limitations. The dTRU has two TX antenna terminals and four RX antenna terminals. The dTRU features a built-in hybrid combiner.
Ericssonwide Internal DESCRIPTION Prepared (also subject responsible if other) / XSNSIXI 8/1551-LZA 701 0001 Uen Approved Checked CBC/XRX/M (Kai Lian) 1.4 Figure 2 4( 8 ) No.
Ericssonwide Internal DESCRIPTION Prepared (also subject responsible if other) 5( 8 ) No. / XSNSIXI 8/1551-LZA 701 0001 Uen Approved Checked CBC/XRX/M (Kai Lian) Figure 3 Date Rev 2011-05-05 C Reference Block diagram of the dTRU with switching relay The TRU consists of the following main blocks: 1.4.1 • CPU system • DSP system • RC system • Radio system CPU System The CPU system is a control unit in the RBS.
Ericssonwide Internal DESCRIPTION Prepared (also subject responsible if other) 6( 8 ) No. / XSNSIXI 8/1551-LZA 701 0001 Uen Approved Checked CBC/XRX/M (Kai Lian) 1.4.2 Date Rev 2011-05-05 C Reference DSP System The DSP system performs all baseband signal processing necessary for one TRX. For downlink, this includes Terrestrial Protocol Handling (TPH), encoding, ciphering and burst generation. For uplink it includes equalization, combining, decoding and TPH. 1.4.
Ericssonwide Internal DESCRIPTION Prepared (also subject responsible if other) 7( 8 ) No. / XSNSIXI 8/1551-LZA 701 0001 Uen Approved Checked CBC/XRX/M (Kai Lian) 1.5.
Ericssonwide Internal DESCRIPTION Prepared (also subject responsible if other) 8( 8 ) No.
