GSM Protocol Stack explained Protocol Stack GSM Layer 1 Radio Transmission GSM900 Upstream : 890 ~915 Mhz Downstream : 935 ~ 960 Mhz Duplex Interval : 45 Mhz Bandwidth : 25 Mhz Frequency Interval : 200 Khz TDM / FDMA Modulation – GMSK GSM Layer 2 – Data Link Layer DLL LAPDm Link Access Procedure…
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GSM SIM Card Identifiers are codes defined by ETSI standards MSISDN Mobile Subscriber Integrated Service Digital Number is a 10 digits number associated with a country code, this is the client mobile number! The MSISDN can have a maximum of 15 digits but isn’t defined the minimum digits. MSISDN = CC Contry Code + NDC…
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Diameter protocol was created on 1998 to be a successor of RADIUS protocol, the main goal was to create a protocol more secure and implemented on signalling network. It can use TCP or SCTP at transport layer and as TLS and DTLS for transport layer security and it has a fail over mechanism using internal…