xDSL (Generic DSL)

xDSL is the umbrella term for the family of Digital Subscriber Line technologies that deliver broadband over copper telephone pairs, including ADSL, ADSL2+, VDSL, VDSL2, SDSL, and G.fast. xDSL has been progressively replaced by fibre-to-the-home (FTTH) and fixed wireless access, but remains in service in many markets where copper outside-plant is still in use.

Categories: Radio Access NetworkIdentity and Subscriber

xDSL in context

The radio access network is the layer where mobile devices attach to the operator's infrastructure. Attacks in this layer include IMSI catching, rogue base stations, downgrade attacks and jamming, and defenses hinge on mutual authentication, integrity-protected signaling and Open RAN supply-chain hygiene.

Subscriber identifiers (IMSI, SUPI, MSISDN, IMEI) are the anchor for authentication, charging, lawful interception and fraud analytics. Any protocol or interface that leaks a permanent identifier is treated as a serious privacy defect, which is why 5G introduced SUCI concealment on the air interface.

To place xDSL in the wider telecom-security picture, review DSL, ADSL, MNO, Broadband, Last Mile and Malware.

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