Ensure Frequency Separation in Wireless Networks
Wireless networks should use different frequencies to avoid interference with each other.
Plain language
Wireless networks need to operate on different frequencies to prevent them from interfering with each other. If they don't, it's like trying to have multiple conversations in a room where everyone is talking over one another-nothing gets through clearly. Without this separation, your internet could slow down, drop out, or even leave your business vulnerable to data loss.
Framework
ASD Information Security Manual (ISM)
Control effect
Preventative
Classifications
NC, OS, P, S, TS
ISM last updated
Aug 2018
Control Stack last updated
18 May 2026
E8 maturity levels
N/A
Guideline
Guidelines for networkingSection
Wireless networksOfficial control statement
Wireless networks implement sufficient frequency separation from other wireless networks.
Why it matters
Insufficient frequency separation can cause RF interference, reducing throughput and availability and causing unstable or dropped wireless connections.
Operational notes
Perform RF site surveys and tune channel plans, widths and transmit power to maintain adequate separation from nearby wireless networks.
Implementation tips
- IT team should map out all wireless networks: Create a diagram that shows where each wireless access point is located and which frequencies they use. This helps to identify any overlaps or potential interference areas.
- Office manager should consult with IT experts: Hire a consultant or reach out to your internet service provider to examine your current wireless setup. They can provide advice on adjusting frequencies to ensure optimal performance.
- System owner should schedule regular checks: At least twice a year, review the frequency allocations for each wireless network to ensure they remain separate and effective. This can prevent new devices or networks from crossing frequencies.
- Procurement team should require frequency separation in new equipment: Ensure that any new wireless equipment you purchase has the capability to operate on various frequencies and that you have the flexibility to adjust these as needed.
- IT team should use network analyser tools: Employ tools that can scan for frequency usage in your area. This helps understand what frequencies are crowded or less used, enabling you to configure your network accordingly.
Audit / evidence tips
- AskA map of wireless access points: Request a diagram showing the location and frequency each access point uses GoodWill show no overlaps in frequency channels
- AskTo see documentation from IT consultations: Request any reports or notes from IT experts or consultants. Check if they include advice on managing and adjusting frequencies. Good documentation will show action points that have been followed
- AskTo review the schedule for frequency checks: Request records of past reviews and the schedule for upcoming checks GoodWill show bi-annual reviews with documented outcomes
- AskProcurement specifications: Request specifications or criteria used when purchasing new wireless equipment. Ensure they include requirements for frequency flexibility GoodWill have checklists or criteria that specify frequency capabilities
- AskTo see results from network analyser tools: Request printouts or screenshots of recent scans GoodIncludes reports showing proactive management of frequencies
Cross-framework mappings
How ISM-1334 relates to controls across ISO/IEC 27001, ISO/IEC 42001, Essential Eight, and ASD ISM.
ISO 27001
| Control | Notes | Details |
|---|---|---|
| link Related (1) expand_less | ||
| Annex A 8.20 | Annex A 8.20 requires networks to be secured and controlled, which includes resilient and interference-aware wireless design where relevant | |
These mappings show relationships between controls across frameworks. They do not imply full equivalence or certification.