GB/T 21646-2008Technical specification and testing methods for analog public radio interphone on 400MHz band (English PDF)

3 Terms and definitions

4 Technical requirements

5 Test conditions

6 Method for the measurement of electrical performance parameters

7 Environmental test requirements

8 Environmental test conditions

9 Environmental test methods

10 Marking, label and instructions for use

11 Packaging, transport and storage

Foreword

This document was issued on 11 April 2008 by the State Administration for Market Regulation and the Standardization Administration of the People's Republic of China, and has been in force since 1 November 2008.

It is the first edition of this standard.

Classification: ICS 33.060.20, CCS M36.

About this edition

GB/T 21646-2008 is the first edition of this standard. It was issued on 11 April 2008 and has been in force since 1 November 2008.

There is no earlier edition to compare it with, so a specification that has to refer to this subject can only cite GB/T 21646-2008 itself.

The interval between issue and effect is the transition period. It exists so that producers, laboratories and buyers can requalify products, revise procedures and use up documentation before the new text becomes the one that applies. The date on this page is the official one from the record of the Standardization Administration.

Classification and status

GB/T 21646-2008 is classified under ICS 33.060.20, in the field of telecommunications. ICS is the International Classification for Standards, the same scheme used by ISO and by the national bodies of most countries, which is what allows a Chinese standard to be placed beside its foreign counterparts on subject rather than on number.

Its Chinese Standard Classification code is CCS M36. CCS is the domestic scheme, a letter for the sector and two digits for the subject within it, and it is the code by which the standard is filed and searched in China.

The GB/T prefix marks a recommended national standard. It is not, in itself, law: it becomes binding when a contract names it, when a regulation or a mandatory standard refers to it, or when a producer declares conformity with it. In practice that covers most of the cases in which it will be read — a purchase specification, an inspection agreement or a certification scheme.