2G GSM Technology Explained
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 Read more…
RAN – Radio Access Network BSS – Base Station Sub System NSS – Network Station SubSystem NMS – Network Management System OSS – Operation Station Subsystem
GSM Components Explained – GSM has different network components SIM – Subscriber Identification Module MS – Mobile Station BTS – Base Transceiver System BSC – Base Station Controller MSC – Mobile Switching Center HLR – Home Location Register VLR – Visitor Location Register EIR – Equipment Identity Register EIR storage Read more…
GSM Channels – GSM as two types of channels Physical and Logical. The Logical channels are divided in two sub channels one for signalling control and other for voice packets. Control / Signalling Channels Broadcast Channels BCH – Downlink BCCH – Broadcast Control Channel carrier the Cell information FCCH – Read more…
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 = Read more…
IMEI and IMEI-SV – International Mobile Station Equipment Identity and Software Version Number is a number used to unique identify a terminal (mobile phone) on 3GPP networks and satellite. IMEI As we said all mobile devices must have a IMEI number associated with each To verify your IMEI press *06# Read more…