Section 03
Critical Communications
Networks built to work on the worst day. Systems specified around the worst day of the year rather than the average one.
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03.1
Why Critical Networks Are Built DifferentlyCoverage, priority and graceful failure beat peak throughput.
By Spectrum Notes
5 min read -
03.2
Push-to-Talk and Group CallsOne-to-many voice, and the design consequences that follow.
By Spectrum Notes
2 min read -
03.3
Designing for the Bad DayRedundancy, fallback and direct mode when the network is gone.
By Spectrum Notes
4 min read
From the same section
3 explainers filed here
Critical Communications
Why Critical Networks Are Built Differently
Coverage, priority and graceful failure beat peak throughput.
Critical Communications
Push-to-Talk and Group Calls
One-to-many voice, and the design consequences that follow.
Critical Communications
Designing for the Bad Day
Redundancy, fallback and direct mode when the network is gone.
Other sections
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01
The Air Interface
What happens between antenna and antenna.
- What Actually Travels Between a Handset and a Mast
- Modulation, Plainly
- What an Antenna Is Doing
- Noise, Interference and the Floor
Standards & Generations
Who writes the rules and what changed when.
- What Each Generation Actually Changed
- The Protocol Stack, Layer by Layer
- How a Standard Gets Written
Spectrum & Networks
Dividing the airwaves and covering ground.
- How Spectrum Gets Divided
- Why Physics Changes With Frequency
- Cells, Reuse and Handover
Devices & Deployment
The terminal and the site.
- What Is Inside the Terminal
- Putting a Network on the Ground