When it comes to providing protection against falls associated with fixed ladders, there are two main options - vertical ladder lines and ladder cages.
Vertical ladder with safety cage Self System
Fixed Ladder With Life Line and Cage - mtandtshrilanka
Permanent Ladder base platforms
Stiffa Vertical Fixed Ladders & Ships Ladder
Cages & Platforms - Alaco Ladder
Fixed Shaft Modular Ladder System - Best Access Doors - Canada
Safety systems, Design and install
Jess Wilkinson - Height Safety Engineers
Fixed Caged Ladder - FLC Series
When Does a Ladder Require a Cage? - Fall Protection Blog
Are Cages Required for Fixed Ladders?