Previous Year Question
Which among the following do/does not belong to the GSM family of wireless technologies?
EDGE
LTE
DSL
Both EDGE and LTE
Correct Answer: C
Detailed Solution
DSL is the correct answer. DSL stands for Digital Subscriber Line. It is a fixed-line technology that carries digital data over copper/twisted-pair telephone lines; it is not a cellular wireless technology.
EDGE is related to GSM technology. EDGE stands for Enhanced Data rates for GSM Evolution and was developed to enhance the data capabilities of GSM-based mobile communication systems. ETSI/3GPP specifications explicitly refer to GSM/EDGE systems.
LTE is also part of the cellular mobile evolution. 3GPP/ETSI specifications cover LTE/E-UTRA, UTRA and GSM/EDGE together in multi-standard mobile-radio specifications. Hence, in the GSM-family/evolution framing used in this question, LTE is not the technology to be excluded.
Therefore, among the given options, DSL alone does not belong to the GSM-family wireless cellular technologies. The current position is unchanged: DSL remains a fixed-line broadband technology, whereas LTE is a 4G cellular technology; hence the answer remains (c).