... (EIR).Together, they form a public land mobile network (PLMN). Figure 1.2 pro-vides an overview of the GSM subsystems.4 GSM Networks: Protocols, Terminology, and Implementation BTSTRXFrequency ... determine the dialed digits. Some8 GSM Networks: Protocols, Terminology, and Implementation multiplexing technique, such a 2-Mbps PCM link can, among others, be parti-tioned into 32 independent channels, ... interface and are presented as shown in Figures 1.4(a) through 1.4(e).10 GSM Networks: Protocols, Terminology, and Implementation The following factors were major contributors to the success of GSM: ãThe...