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Foundations
0
How a mobile network works (the big picture)
1
SMS, end to end
2
HLR and VLR
Signalling (SS7)
3
SS7 introduction (the plain-words story)
4
SS7 deep dive (fields and protocols)
Voice & generations
9
Voice calls, from 2G circuit to VoLTE and VoNR
10
Every generation: 1G to 6G
11
4G LTE and the EPC
12
5G: New Radio and the service-based core
Radio, transport, numbers
13
Radio, spectrum and transport (how bits actually travel)
14
Identities, numbers, SIMs and services
20
Radio engineering: propagation, link budget and network planning
19
Fixed access, optical and enterprise networks
Wireless beyond cellular
18
Wi-Fi, Bluetooth, short-range and low-power wide-area networks
17
Satellite communications and Non-Terrestrial Networks (NTN)
21
Public safety, railways, vehicles and emergency communications
Law & regulation
22
Regulation, law and the Croatian market
Security & fraud
5
The SMS firewall and the fraud landscape
6
Most common cases and real incidents
15
Security across all generations and the firewall family
Practice & operations
23
Protocol trace lab: reading real signalling
24
Troubleshooting playbook and career toolkit
Reference & review
16
Cheat sheets and comparisons
7
Reference
8
Self-test
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Acronym glossary
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Wi-Fi & IoT
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