Skip to main content

Developed and maintained by the NFCC

Appendix C – Reporting interference



Spectrum Management Centre Services available in response to Emergency Services Interference investigation requests

Requests for interference investigation to Emergency Services should be directed to Ofcom’s Spectrum Management Centre (SMC) on 01462 428528 or via email

The SMC provides triage of incoming requests on a 24/7 basis for interference resolution relating to radio communications services where Safety of Life or Critical Service is at risk.

The Duty Engineering Officer (DEO) on shift requires the following information from the reporting officer:

  • Who they are, and their contact details?
  • The frequency(s) and channel(s) affected;
  • When did the interference first start and how long it has been occurring;
  • The area/postcode of the area/users affected by the interference;
  • The base station site location (NGR or Postcode will suffice) affected;
  • The nature and severity of the interference – impact on service provided;
  • Description of the interference identified i.e. warbling or static noise;
  • If the report of interference is from engineering staff the following is required:
    • noise or modulation type;
    • if narrow or wideband;
    • spectrum analyser screenshots if available;
    • spectrum plots if available.
  • Are there any site access restrictions that our engineer should be aware of.

Based on the above information, the DEO will be able to assess, in agreement with the person making the report, what priority of response will be given to the interference investigation. The priority of the response will be based on the information provided in Table 1 Case Impact Assessment v Priority Guidance and Table 2 External Key targets (below).

Table 1: Case impact assessment v priority guidance


Impact on consumer/stakeholder


For example, the system is inoperable or significantly degraded


For example, the system is degraded but usable

Slight (nuisance)

For example, the system is disrupted from its normal operation by the interference

No immediate alternative form of communication is available. There is a life safety risk.

Priority 1

Priority 2

Priority 3

No immediate alternative form of communication is available. There is no immediate life safety risk. Efficient emergency/public services are disrupted or jeopardised.

Significant numbers of consumers are severely affected.

Priority 2

Priority 3

Priority 4

An alternative form of communication is available to emergency/public services. No alternative form of communications is available to business/services critical operations. Significant numbers of consumers are affected

Priority 3

Priority 3

Priority 4


Table 2: External Key targets



Time to first visit


Priority 1

8 hours

2 calendar days

Priority 2

18 hours

3 calendar days

Priority 3

2 working days

6 working days


Originally issued: 30 October 2013