Global system for mobile communication (GSM) is a globally accepted standard This tutorial provides an introduction to basic GSM concepts, specifications. GSM Technology. Global System for Mobile Communication or. Groupe Special Mobile. To standardize cellular communication thoughout. Europe. Prior to it's. PDF | GSM means Global System for mobile communication. GSM is generally utilized mobile correspondence framework on the planet. GSM framework was.
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HUTCH. A PROJECT REPORT ON SUMMER TRAINING ON GSM ARCHITECTURE. Academic Session: At HUTCHISON ESSAR, AIRCEL. GSM word file - Free download as Word Doc .doc), PDF File .pdf), Text File .txt) or read online for free. the pdf has some probs in figures,, so this is the original. GSM is a globally accepted standard for digital cellular communications. .. Modulation is the process of transforming the input data into a suitable format for the.
Indoor coverage is also supported by GSM and may be achieved by using an indoor picocell base station, or an indoor repeater with distributed indoor antennas fed through power splitters, to deliver the radio signals from an antenna outdoors to the separate indoor distributed antenna system. These are typically deployed when significant call capacity is needed indoors, like in shopping centers or airports.
However, this is not a prerequisite, since indoor coverage is also provided by in-building penetration of the radio signals from any nearby cell.
Regardless of the frequency selected by an operator, it is divided into timeslots for individual phones. This allows eight full-rate or sixteen half-rate speech channels per radio frequency.
These eight radio timeslots or burst periods are grouped into a TDMA frame. Half-rate channels use alternate frames in the same timeslot.
The channel data rate for all 8 channels is Voice codecs[ edit ] GSM has used a variety of voice codecs to squeeze 3. Originally, two codecs, named after the types of data channel they were allocated, were used, called Half Rate 6.
These used a system based on linear predictive coding LPC. In addition to being efficient with bitrate s, these codecs also made it easier to identify more important parts of the audio, allowing the air interface layer to prioritize and better protect these parts of the signal. Finally, with the development of UMTS , EFR was refactored into a variable-rate codec called AMR-Narrowband , which is high quality and robust against interference when used on full-rate channels, or less robust but still relatively high quality when used in good radio conditions on half-rate channel.
The SIM is a detachable smart card containing the user's subscription information and phone book. This allows the user to retain his or her information after switching handsets.
Alternatively, the user can change operators while retaining the handset simply by changing the SIM. Phone locking[ edit ] Sometimes mobile network operators restrict handsets that they sell for exclusive use in their own network. This is called SIM locking and is implemented by a software feature of the phone.
It provides an overview of the discovered results in table view in CSV format and in German. It does not have support for notes, overrides and some additional information.
Like the HTML format it is neutral. TXT This creates a text file. This format is especially useful when being sent by Email.
XML The report is being exported in the native xml format. Contrary to the other formats this format contains all results and does not format them at all. Greenbone includes many report plugins by default. The report plugins define the format of the reports to be exported. Many report plugins reduce the available data in order to display it in a meaningful way. To do so use the Container Task see also section Container Task.
The overview see figure Greenbone includes many report plugins by default. For every plugin in the individual columns the following information is being displayed: Extension: The file name of the downloaded report through the respective plugin is comprised of the UUID unique internal ID of the report and this extension.
Among others, the extension supports the browser to start a compatible application in case the specified content type is not recognized. Content Type: The content type specifies the format in use and is being transmitted when being downloaded. That way a compatible application can be launched by the browser directly.
Additionally the content type is important internally: It is being used to offer suitable plugins within its context. Trust: Some plugins only consist of a data transformation while others execute more complex operations and also use support programs. To avoid misuse the plugins are digitally signed. If the signature is authentic and the publisher trusted, it is ensured that the plugin exists in the exact format as certified by the publisher.
The verification does not occur automatically rather than manually with the verify icon. The date of the verification is saved automatically. This function should definitely be used for all newly imported plugins before they are being activated.
This is not required for the supplied default plugins. Active: The plugins are only available in the respective selection menus if they were activated. Newly imported plugins are always deactivated at first. New report formats plugins can be imported easily. They do not need to be manually imported anymore.
To import a report plugin the respective xml file must be downloaded from Greenbone. Select the icon to add the new format. Imported formats should be verified before activation.
New report formats plugins can be activated easily.
Select the respective file and then import the format. After importing the new format is not active yet. Report plugins can be signed by the publisher. This signature should get verified before activation.
This verification is being done automatically when importing. The result with the date of the verification is being displayed in the Trust column. If the report plugin is trusted it can be activated afterwards. To do so, edit the report plugin by clicking the edit icon in the Actions column.