TIA-102.CACA:2007 (R2013)

$61.75

Project 25 – Inter RF Subsystem Interface (ISSI) – Measurement Methods for Voice Services

Published By	Publication Date	Number of Pages
TIA	2007	174

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Category: TIA

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Description

This document defines measurement methods recommended for
assessing the performance of Inter-RF Subsystem Interface (ISSI)
voice services (IVS) provided by Project 25 (P25) Radio Frequency
Subsystems (RFSSs) interconnected in accordance with P25
standardized ISSI functional services and protocols [1]. The ISSI
enables mandatory standard subscriber unit-tosubscriber unit
(SU-to-SU) and group voice services among subscribers registered at
different RFSSs. The normative references define the ISSI
functional services and protocols. The informative references
provide an overview of the ISSI, including identification of
relevant user requirements, and related background information. The
scope of this document is limited to the definition of measurement
methods applicable to the functional services and protocols
standardized by the normative references.

The objective of this document is to standardize measurement
methods that define measurement parameters and measurement
procedures recommended for assessing performance attributable to
the ISSI in the provision of P25 wide area voice
services.¹ The purpose of this document is to make
possible meaningful comparisons of the results of measurements made
by different observers of P25 wide area voice services involving
the ISSI. The intended users of this document include P25 voice
service providers, equipment manufacturers, and end users. This
document may be used (1) by service providers in the planning,
development, and assessment of P25 voice services that meet end
user performance needs, (2) by equipment manufacturers as
performance metrics that will affect equipment design, and (3) by
end users in evaluating performance.

¹ In the context of this document, P25 wide area
voice services are any SU-to-SU or group PTT call types that invoke
ISSI functional services and protocols (i.e., when use of more than
one RFSS is required for a particular IVS call scenario of
interest). The term P25 wide area voice services (or, in
the context of this document, similar terms such as wide area
call) is used to emphasize that a principal role of the ISSI
is to increase the geographical coverage area for roaming SUs;
however, the ISSI more generally enables the interconnection of
multi-vendor RFSSs among and within P25 systems.