HDSL (High-Bit-Rate Digital Subscriber Line)

HDSL in context

The mobile core is where subscriber sessions, mobility and policy live. In 4G it is the EPC (MME, HSS, S/PGW); in 5G it is the Service-Based Architecture with AMF, SMF, UPF, AUSF, UDM and the NRF. Core exposure is the difference between a single-subscriber leak and a fleet-wide breach.

Telecom networks depend on Internet-style routing (BGP, DNS, MPLS) for interconnect, transport and application delivery. Route hijacks and DNS abuse can degrade or intercept signaling as easily as any application-layer attack, which is why RPKI and DNSSEC are now standard hardening for carrier networks.

To place HDSL in the wider telecom-security picture, review SDSL, SCN, A5/3, Decryption, FDD and IN.

Related terms

• SDSL
• SCN
• A5/3
• Decryption
• FDD
• IN
• SCP
• Authorization

Related topic hubs

• Diameter Security 4G/LTE Diameter threats across IPX/roaming and DEA defenses.
• Diameter Attacks S6a IDR/PUR/CLR abuse, subscriber tracking, LTE signaling attacks.
• LTE Security Training Training on 4G/LTE core, Diameter, NAS and RRC security.
• Tracking Area Update LTE TAU procedure and its signaling risks.

More from the TelcoSec Glossary

Browse the full TelcoSec Glossary, the Ultimate Guide to Mobile Network Security, or the P1 Arsenal of telecom-security tools.