Codan Radio P25 Training Guide - Manual (Page 23)

P25 RADIO SYSTEMS | TRAINING GUIDE
Chapter 2: P25 Interface Standards Page 15
CHAPTER 2: P25 INTERFACE STANDARDS
P25 STANDARDS – GENERAL SYSTEM MODEL
This section will introduce the reader to the P25 General System Model and the P25 interface standards
that are integral to the P25 radio systems.
There are currently more than forty technical documents in the set of P25 standards. The
Telecommunications Industry Association (TIA) developed these standards through well defi ned user
input. The P25 users continue to enlarge a Statement of Requirements while the industry develops the
standards for those requirements and the Project 25 Steering Committee verifi es their adherence to
the users’ needs. The P25 documents have also been approved by the American National Standards
Institute (ANSI
® ) as ANSI ® standards. This is the ultimate recognition in the United States of the utility
and support of a technology as a standard.
The individual documents describe component interfaces needed to build systems. Depending upon
the type of system the user needs, individual documents are available that detail how standardized
elements can make up a standardized system. These systems can be trunked or conventional, they
can be voice only, data only or voice and data, and they can be clear or encrypted.
The P25 standards are contained in the TIA-102 suite of documents. Copies of the standards
documents may be purchased through Global Engineering Documents by commercial entities. Public
agency users can get a copy of all of the documents on a CD-ROM from the National Communications
System (NCS). NCS is the standards arm of the U.S. Department of Defense. Copies may also be
obtained from the Department of Justice, National Institute of Justice (NIJ) Standards and Technology
Group. NIJ is a primary advocate and supporter of the Project 25 process.