A summary of TSB-88 and EDX TSB88 features

TSB-88 is a large and complex document (a TIA Telecommunications Systems Bulletin) created and owned by the U.S. Telecommunications Industry Association (TIA). This document provides information and advice to manufacturers and users of primarily Land Mobile and Public Safety radio systems. It provides guidance as to performance criteria for different types of radio technologies and methods for measuring/predicting system performance.  It makes no claims as to the accuracy of its information or methods. 

When designing a radio system typically a radio engineer wishes to know what is the minimum signal level needed to provide an acceptable level of voice quality performance for the radio system user. TSB88 begins by defining various levels of DAQ (delivered audio quality). A DAQ of 3.4 is considered to be reasonable (speech understandable with repetition only rarely needed. Some noise/distortion); this is comparable to a SINAD of 20dB. Then it provides tables listing modulation types used by various radio technologies along with the CPC (channel performance criterion) needed to achieve each DAQ . For example, the listing for TETRA indicates a CPC of 16dB C/(I+N) is needed to achieve a DAQ of 3.4. In addition, a DAQ level is also representative of BER% – in the TETRA case DAQ 3.4 is 2% BER. 

The TSB-88 document provides several suggested methods for predicting the CPC and the reliability of the signal for that CPC over a defined area. TSB-88 is similar to the ITU Recommendations in that you are provided with various options when doing something and it is up to each person to decide how they want to proceed. Our TSB-88 studies section is based on what the majority of our U.S. land mobile radio customers have requested. Please reference the Appendices found in the EDX program documentation (Help -> Contents -> Appendices) or look in the \help\pdf folder of the EDX program installation directory. In Section F.9 there are explanations about the studies we do in our TSB-88 studies section. The primary study is the TSB88 Monte Carlo Bounded Area Coverage. This runs a study that generates a map of areas covered by a reliable signal and also generates a report listing the sq km of the covered area using TSB-88 definitions.