ISM-1105 policy ASD Information Security Manual (ISM)

Ensure Wall Outlets Have Appropriate Cable Security

Wall outlets for SECRET and TOP SECRET should only have cables that match these classifications.

Preventative S TS ASD Information Security ManualGuidelines for communications infrastructure cabling labelling

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Plain language

This control focuses on making sure that the cables connected to wall outlets designated for SECRET and TOP SECRET information match the sensitivity level of those areas. This matters because using less secure cables in these outlets could lead to data leaks or unauthorised access, putting very sensitive information at risk.

01 - Overview

Framework

ASD Information Security Manual (ISM)

Control effect

Preventative

Classifications

S, TS

ISM last updated

Feb 2023

Control Stack last updated

18 May 2026

E8 maturity levels

N/A

Guideline

Guidelines for communications infrastructure

Section

Cabling infrastructure

Topic

Wall Outlet Boxes

Official control statement

SECRET and TOP SECRET wall outlet boxes contain exclusively SECRET or TOP SECRET cables.

policy ASD Information Security Manual (ISM) ISM-1105

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Why it matters

Improper cable security at SECRET/TOP SECRET wall outlets can enable interception or unauthorised access to classified traffic, risking national security.

settings

Operational notes

Inspect wall outlet boxes to confirm only SECRET/TOP SECRET-rated cables are present, and remove/replace any mismatched cable runs promptly.

02 - Implement

build

Implementation tips

The IT manager should identify all wall outlets in areas where SECRET and TOP SECRET information is handled. They can do this by walking through each section, checking building plans, and noting locations.
The procurement officer should ensure that only cables designed for SECRET and TOP SECRET use are purchased for these wall outlets. They can achieve this by checking supplier catalogues and matching product specifications with security requirements.
Technicians need to install the cables in SECRET and TOP SECRET outlets, ensuring that each cable's classification matches the outlet's classification. They can do this by following a checklist that verifies cable specifications before installation.
The facility manager should label all SECRET and TOP SECRET wall outlets to prevent accidental misuse. This can be done with clear and permanent signs or tags directly on or near the outlets.
HR should organise training for staff on the importance of using the correct cables in these designated outlets. They can arrange for short informational sessions that cover possible risks and correct behaviours.

03 - Audit

fact_check

Audit / evidence tips

AskThe building's cabling inventory records: Request a list of cables used in SECRET and TOP SECRET areas GoodShows cables labelled specifically for SECRET and TOP SECRET use only
GoodShows consistent purchasing of correctly classified cables
AskDemonstration of labelling on wall outlets: Visit areas with SECRET and TOP SECRET outlets to see the physical labels. Verify that labelling is visible and matches what is indicated in the documentation GoodConfirms all outlets are correctly labelled in the field
GoodIncludes regular audit intervals with correct outcomes
AskAttendance records from training sessions: Request documentation showing who has attended training on this control. Check if all relevant staff members were present and if refreshers are scheduled GoodShows comprehensive coverage and retention activities

04 - Mappings

link

Cross-framework mappings

How ISM-1105 relates to controls across ISO/IEC 27001, ISO/IEC 42001, Essential Eight, and ASD ISM.

ISO 27001

Control	Notes	Details
layers Partially meets (1) expand_less
Annex A 7.2	ISM-1105 requires that wall outlet boxes used for SECRET and TOP SECRET contain only cables of the same classification, preventing cross-...

These mappings show relationships between controls across frameworks. They do not imply full equivalence or certification.