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Local Service Organization Service Manual BE INSPIRED SIEMENS COMMUNICATIONS UNLIMITED Our innovation shapes the future SIEMENS PTE LTD A55 Level 2 Service Manual Table of Contents 1 CELLULAR COMMUNICATION...2 1.1 Subscriber Identity Module (SIM)...4 2 3 4 5 WIRELESS APPLICATION PROTOCOL (WAP)...6 KEY FEATURES...8 COMPARISON WITH PERVIOUS PRODUCT...10 ACCESSORIES...11 5.1 5.2 Interface A55 with Accessories...11 Accessories Part Numbers...12 6 UNIT DESCRIPTION A55 PIRANHA...13 6.1 Exploded View of A55 Piranha...14 7 8 9 DISASSEMBLY OF A55...15 REASSEMBLY OF A55...17 MOBILE SOFTWARE PROGRAMMING...18 9.1 9.2 Mobile Software Updating...19 Flow Chart for Software Updating...20 10 11 12 13 SIEMENS SERVICE EQUIPMENT USER MANUAL...21 PICS INTERNET...22 INTERNATIONAL MOBILE EQUIPMENT IDENTITY, IMEI...27 GENERAL TESTING INFORMATION...28 Copyright © Siemens Pte Ltd. Centre All Rights Reserved ICM MP CCQ ASP/ASC Siemens Technical Support 1 of 33 Internal Use Only SIEMENS PTE LTD A55 Level 2 Service Manual 1 Cellular Communication The cellular systems are made up of numerous transmitting and receiving sites, whose individual coverage areas partially overlap. The concept of frequency reuse, same frequency is used by several sites, allows a high traffic density in a wide area. Due to the limited transmission range of the terminals, cellular systems are based on a large number of base stations on the infrastructure side, scattered over the area to cover, with each covering a fairly small geographical zone called cell. Cells are often represented by hexagons (see figure 1.1). Figure 1.1 Cellular coverage representation. GSM Net Architecture GSM network can be broadly divided into three broad parts, namely: 1. Mobile Station (MS) carried by the subscriber, 2. Base Station Sub-system (BSS) which controls the radio link with the mobile stati