Terminate Cabling Closely in Top Secret Areas
In TOP SECRET areas, ensure cables are terminated very close to cabinets for security.
Plain language
In areas handling top secret information, it's crucial to have cables end very close to their cabinets to prevent security risks like data theft or tampering. If cables are left exposed, someone could potentially tap into them and access sensitive information, leading to severe consequences for your business or organisation.
Framework
ASD Information Security Manual (ISM)
Control effect
Preventative
Classifications
NC, OS, P, S, TS
ISM last updated
Nov 2021
Control Stack last updated
19 Mar 2026
E8 maturity levels
N/A
Section
Cabling infrastructureOfficial control statement
In TOP SECRET areas, cable reticulation systems leading into cabinets in server rooms or communications rooms are terminated as close as possible to the cabinet.
Why it matters
Improper cable termination in TOP SECRET areas increases tapping risk, enabling data interception and espionage or classified data breaches.
Operational notes
Regularly confirm cabling is terminated as close as possible to cabinets; inspect trays/conduits for gaps, tampering, or unauthorised changes.
Implementation tips
- Facilities Manager should inspect cabling routes: Conduct a walkthrough of top secret areas to assess where cable terminations are relative to the cabinets. Ensure any exposed lengths are minimised to prevent unauthorised access.
- IT team must plan cabling layout: When setting up or upgrading cabinets in top secret areas, the IT team should design the cable routes to ensure the final connections are as close as possible to the cabinets. Use cable management accessories to help keep the layout tidy and secure.
- Security Officer should verify installation procedures: Work with facilities staff to incorporate verification checks during installation ensuring cables are terminated close to cabinets. Regular checks can ensure compliance with security standards.
- Training for technical staff: Conduct a training session to educate the technical team on the importance and methods for securing cable terminations, ensuring everyone understands the risks associated with improper installation.
- Conduct periodic reviews: Establish a routine schedule for reviewing cabling set-ups in top secret areas. Involve both the IT and facilities teams to confirm cables remain adequately terminated close to all cabinets.
Audit / evidence tips
- AskCabling plans: Request detailed schematics showing cabling layouts in top secret areas
- GoodWill have initials or signatures indicating oversight during installation
- AskLogs that document regular checks and maintenance of cabling systems
- AskThe organisation’s policy on cable termination practices in top secret areas GoodPolicy will highlight the requirement for minimising cable exposure
Cross-framework mappings
How ISM-1101 relates to controls across ISO/IEC 27001, ISO/IEC 42001, Essential Eight, and ASD ISM.
ISO 27001
| Control | Notes | Details |
|---|---|---|
| layers Partially meets (2) expand_less | ||
| Annex A 7.6 | ISM-1101 requires a specific security measure for TOP SECRET environments: terminating cable reticulation systems as close as possible to... | |
| Annex A 7.12 | ISM-1101 requires that, in TOP SECRET areas, cable reticulation systems entering cabinets in server/communications rooms are terminated a... | |
These mappings show relationships between controls across frameworks. They do not imply full equivalence or certification.