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In accordance with ''ITU Radio Regulations'' (article 1) variations of this ''radiocommunication service'' are classified as follows:<br />
'''Standard frequency and time signal service''' (article 1.53)<br />
* [[Standard frequency and time signal-satellite service]]'
==Frequency allocation==
The allocation of radio frequencies is provided according to ''Article 5'' of the ITU Radio Regulations (edition 2012).<ref>''ITU Radio Regulations, CHAPTER II – Frequencies, ARTICLE 5 Frequency allocations, Section IV – Table of Frequency Allocations''</ref>
In order to improve harmonisation in spectrum utilisation, the majority of service-allocations stipulated in this document were incorporated in national Tables of Frequency Allocations and Utilisations which is with-in the responsibility of the appropriate national administration. The allocation might be primary, secondary, exclusive, and shared.
*primary allocation: is indicated by writing in capital letters (see example below)
; Example of frequency allocation:
{| class=wikitable
|- bgcolor="#CCCCCC" align="center"
|align="center" colspan="3"| '''Allocation to services'''
|- align="center"
| [[International Telecommunication Union region|Region 1]] || Region 2 || Region 3
|-
|colspan="3"|19.95-20.05 kHz '''STANDARD FREQUENCY AND TIME SIGNAL (20 kHz)
|-
|colspan="3"|2 498-2 501 kHz STANDARD FREQUENCY AND TIME SIGNAL (2 500 kHz)
|-
|colspan="3"|4 995-5 003 kHz STANDARD FREQUENCY AND TIME SIGNAL (5 000 kHz)
|-
|colspan="3"|5 003-5 005 kHz STANDARD FREQUENCY AND TIME SIGNAL<br />
:::::: Space research
|-
|colspan="3"|9 995-10 003 kHz STANDARD FREQUENCY AND TIME SIGNAL (10 000 kHz)
|-
|}
== References / sources ==
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