# NIST SP 800-53 Rev. 5 AC-18(5) — Antennas And Transmission Power Levels - Source: https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/ac-18-5-antennas-and-transmission-power-levels - Section: [Compliance](https://support.icompaas.com/compliance) › [NIST SP 800-53 Rev. 5 Controls](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5) › AC — Access Control - Last updated: 2026-06-05 - Publisher: iCompaas, Inc. (https://www.icompaas.com) **NIST SP 800-53 Rev. 5**·Control `AC-18(5)`·high·Component: **Access Control** ## What this control requires > Selects radio antennas and calibrates transmission power to minimize signal reception outside organization-controlled boundaries, reducing unauthorized access via wireless surveys. This control supports the Directional Antenna capability within the Access Control family. > > — NIST SP 800-53 Rev. 5, Control AC-18(5) ### In plain English Selects radio antennas and calibrates transmission power to minimize signal reception outside organization-controlled boundaries, reducing unauthorized access via wireless surveys. In practice, this means you can prove you access management-level controls on a defined cadence. ## Why it matters SP 800-53 is the catalogue every U.S. federal authorisation (FedRAMP, FISMA, CMMC) and most regulated industries point at. A missing control surfaces as a Plan of Action & Milestones (POA&M) item that an Authorizing Official must approve before the Authority To Operate is granted or renewed. This control is rated **high**. Auditors expect a named owner, a remediation SLA, and a tooling artefact that evidences continuous operation. ## What an auditor looks for A 3PAO (FedRAMP) or Independent Assessor (NIST RMF) tests against NIST SP 800-53A assessment procedures. For each control they expect a documented implementation that addresses every assessment objective (Examine, Interview, Test) and an implementation summary in the System Security Plan. Within **Access Control**, the assessor will trace your implementation back to the catalogue reference (Control AC-18(5)) and look for objective evidence on the latest two assessment cycles. ## How to implement 1. Write a short policy stating intent, scope and named owner. 2. Encode it as a platform guardrail — SCP, Azure Policy initiative, Organisation Policy, or repository policy. 3. Wire a monitoring signal that catches drift (CSPM rule, SIEM rule, scheduled query, Workspace alert) and ticket it. 4. Review on a documented cadence and capture the review in the risk register or compliance tracker. ### Operational checklist - **Access.** Document the trigger, the owner and the cadence. - **Review.** Document the trigger, the owner and the cadence. - **Wireless.** Document the trigger, the owner and the cadence. - **Antennas.** Document the trigger, the owner and the cadence. - **Access Control.** Document the trigger, the owner and the cadence. - **Scope:** management, access control, organization, transmission power levels, controls, identity, review, capability. ## Evidence to collect - **Identity Scan.** IAM / IdP exports — Entra ID, Okta, IAM Identity Center, Workspace directory — showing accounts, roles, MFA state and last sign-in. Identity analytics (Okta, SailPoint, Access Analyzer) demonstrates least-privilege. Focus: Antennas And Transmission Power Levels. ## How it maps to other frameworks Computed from shared tags, control component and key-operation subjects — handy when you are reconciling controls across an audit. - [**CIS Controls v8 6.7** — Centralize Access Control](https://support.icompaas.com/compliance/cis-controls-v8/6-7-centralize-access-control) - [**NIST SP 800-171 Rev. 3 3.1.7** — Least Privilege - Privileged Functions](https://support.icompaas.com/compliance/nist-sp-800-171-rev-3/3-1-7-least-privilege-privileged-functions) - [**SOC 2 (2017 TSC) CC6.1** — Logical Access Controls](https://support.icompaas.com/compliance/soc-2-trust-services-criteria/cc6-1-logical-access-controls) - [**BSI C5:2020 PS-04** — Physical site access control](https://support.icompaas.com/compliance/bsi-c5-2020/ps-04-physical-site-access-control) - [**ISO/IEC 27001:2022 A.8.2** — Privileged access rights](https://support.icompaas.com/compliance/iso-27001-2022/a-8-2-privileged-access-rights) ## Related controls in NIST SP 800-53 Rev. 5 - [**Control AC-10** — Concurrent Session Control](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/ac-10-concurrent-session-control) - [**Control AC-5** — Separation Of Duties](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/ac-5-separation-of-duties) - [**Control AC-6(6)** — Privileged Access By Non-Organizational Users](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/ac-6-6-privileged-access-by-non-organizational-users) - [**Control AC-3(2)** — Dual Authorization](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/ac-3-2-dual-authorization) - [**Control AC-2(4)** — Automated Audit Actions](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/ac-2-4-automated-audit-actions) - [**Control AC-3(12)** — Assert And Enforce Application Access](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/ac-3-12-assert-and-enforce-application-access) ## References - [NIST Computer Security Resource Center — NIST SP 800-53 Rev. 5](https://csrc.nist.gov/Projects/risk-management/sp800-53-controls) - Catalogue identifier: `Control AC-18(5)` Topics: identity accessidentity managementaccess reviewprivileged accessenvironmental controls ## Related compliance guidance - [NIST SP 800-53 Rev. 5: a practical implementation guide for cloud teams](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5): Start with the full NIST SP 800-53 implementation guide — scope, roadmap, evidence and how the assessment runs. - [NIST SP 800-171 and CMMC: a practical guide to protecting CUI in the cloud](https://support.icompaas.com/compliance/nist-sp-800-171-rev-3): If your obligation is protecting CUI in your own systems for a federal or defence contract, this derived subset — not the full catalogue — is the requirement. - [SOC 2 compliance: a practical implementation guide for cloud-native SaaS teams](https://support.icompaas.com/compliance/soc-2-trust-services-criteria): Most commercial SaaS already hold a SOC 2 Type 2, and FedRAMP 20x Class A is designed for providers that have one.