sm_X1_Lvl2_V2.1.pdf

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Local Service Organization Service Manual
Xelibri X1
SIEMENS COMMUNICATIONS UNLIMITED
V2.1
Table of contents
Cellular Communication.............................................................................................................................................1
Coverage Concept...................................................................................................................................................1
GSM Network Architecture..................................................................................................................................2
Subscriber Identity Module (SIM).......................................................................................................................3
SIM Application Toolkit........................................................................................................................................4
Extended GSM 900, E-GSM.................................................................................................................................4
Level 2 Service Guide...................................................................................................................................................5
Introduction.............................................................................................................................................................5
Xelibri X1 Technical Information........................................................................................................................6
Accessories ...............................................................................................................................................................8
Xelibri X1 Mechanical Diagrams.........................................................................................................................9
Mechanical Construction ....................................................................................................................................12
Xelibri X1 Spare Parts Level 1 and Level 2 / 2.5 .............................................................................................13
Disassembly ...........................................................................................................................................................14
Assembly ................................................................................................................................................................19
Replacement of Mechanical Parts......................................................................................................................22
Phone Unblocking.................................................................................................................................................32
Xelibri X1 Service Menu.......................................................................................................................................33
Service menu structure ........................................................................................................................................33
Service menu tests.................................................................................................................................................34
General Testing Information
..............................................................................................................................37
Annex 1
.....................................................................................................................................................................40
Annex 2
.....................................................................................................................................................................40
Annex 3
.....................................................................................................................................................................41
i
Chapter
Cellular Communication
Coverage Concept
1
The cellular system is made up of numerous transmitting and receiving sites, whose individual
coverage areas partially overlap. The concept of frequency re-use, 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 below).
CELLULAR COVERAGE REPRESENTATION
1
GSM Network Architecture
GSM network can be broadly divided into three broad parts, namely:
Mobile Station (MS) carried by the subscriber, Base Station Sub-system (BSS), which controls the
radio link with the mobile station. Mobile Switching Center (MSC), which performs the switching of
calls between the mobile users, and between mobile and fixed network users.
GSM ARCHITECTURE
Each mobile station is given a unique identity. As soon as the mobile phone is turned on, it
registers with the network and is authenticated; as such the network could always find the mobile
phone.
Larger amount of data is being exchanged to and from the following functional blocks in the MSC:
Visitor Location Register, VLR
Stores information about mobile subscribers that enter it coverage area, which is associated with
the geographical area where the mobile is currently roaming. When there is an incoming call for
the mobile, the HLR is interrogated about the present address of the VLR.
Home Location Register, HLR
A database that contains all data concerning the subscription of the mobile subscriber, i.e. their
access capabilities, subscribed services, and supplementary services. It also contains information
about the VLR that is handling the mobile station currently. When the mobile changes location,
the HLR is updated accordingly. It also provides the MSC with information about the MSC area
where the mobile is actually located to allow incoming calls to be routed immediately to the called
party.
Authentication Center, AUC
Stored information that is necessary to protect communication through the air interface against
any intrusions. The legitimacy of the subscriber is established through authentication and
ciphering, which protects the user information against unwanted disclosure.
Equipment Identity Register, EIR
An option the network operator can use to enforce security. With this feature the network can
identify defective or stolen mobile that may not be used in the network.
2
Subscriber Identity Module (SIM)
SIM is a smart card, which has a computer, and memory chip that is permanently installed in the
mobile equipment. It comes in either the size of a credit card or smaller version known as the
plug-in SIM.
The subscriber information, which includes a unique number called the International Mobile
Subscriber Identity (IMSI), is stored in the SIM card. SIM card identifies the subscriber to the
network.
To protect the SIM card from improper use, a security feature, a four digits personal identification
number (PIN), is built in. The PIN is stored in the SIM card and can be changed by the subscriber.
PIN2 is required for additional functions available with a special SIM card (Consult the operator for
more information about the PIN 2).
A code (PUK) is provided for unlocking the SIM card if the SIM card is blocked
3

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