1、TIA TELECOMMUNICATIONS SYSTEMS BULLETIN Project 25 Mobile Radio Push-to-Talk and Audio Interface - Definitions and Methods of Measurement TSB-102.CAAC SEPTEMBER 2002 TELECOMMUNICATIONS INDUSTRY ASSOCIATION The Tckwmmmicatiorw Indiivtry Association represents the mmunicatiorw secior of Elactionic Ind
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8、 document every five years, but it maybe revised and updated at any time as may be occasioned by changes in technology, industry practice, or government regulations, or for other appropriate reasons. (From Project No. 3-0052, formulated under the cognizance of the TIA TR-8.1 Subcommittee on Private
9、Land Mobile Transceiver Measurement Methods .) Published by TELECOMMUNICATIONS INDUSTRY ASSOCIATION 2002 Standards and Technology Department 2500 Wilson Boulevard Arlington, VA 22201 U.S.A. PRICE: Please refer to current Catalog of TIA TELECOMMUNICATIONS INDUSTRY ASSOCIATION STANDARDS AND ENGINEERIN
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19、MENT OF THE USE OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. TSB-102.CAAC Foreword This foreword is not part of this bulletin. This Telecommunications Systems Bulletin was prepared by the TR-8.1 subcommittee on Private Land Mobile Radio Measureme
20、nt Methods. This Bulletin represents the consensus of the drafting task group and the formulating subcommittee at the time of publication. This document is part of the suite of documents comprising Project 25 standards. i TSB-102.CAAC Table of Contents 1 . Introduction . 1 1 . 1 Scope . 1 1.3 Audio
21、1 1.4 Applicability 2 1.2 Functions . 1 1.5 References 2 2 . Physical Interface . 2 2.1 Standardization 2 2.2 Connector Location 2 2.3 Securing Mating Connector . 2 2.4 Dedicated or Universal Connector . 3 3 . Electrical Interface 3 3.1 Transmit Audio Interface 3 3.2 Receive Audio Interface . 3 3.3
22、Push-to-talk Interface . 3 3.4 Qualified Audio Present Signal 3 3.5 Chassis Ground . 4 4 . Standard Test Conditions . 4 4.1 Standard Definitions . 4 4.2 Standard Test Conditions 4 4.3 Characteristics of Test Equipment . 4 5 . Methods of Measurement . 5 5.1 Methods of Measurement for Receiver Interfa
23、ce . 5 Receiver Interface Audio Output . 5 5.1 . 1 . 5.1.2. 5.1.3. 5.2.1 . Electrical Audio Performance 7 5.2.2. Residual Audio Noise Ratio 6 Qualified Audio Presence . 7 5.2 Methods of Measurement for Transmitter Interface . 7 Transmitter Key Control Switch . 9 ii TSB-102.CAAC Receive Audio Push-to
24、-talk 1. Introduction A(m) PTT 1.1 Scope Qualified Audio Presence This document defines a physical and electrical interface to Project 25 mobile radios. The purpose of the interface is to allow standardized interfacing of external devices that require one or more of the functions of push-to-talk, qu
25、alified audio presence, transmit audio, and receive audio. Some examples of such external devices are, 1) fire apparatus intercom and radio control audio and keying systems, 2) headset systems, 3) ambulance audio and keying systems, and 4) airborne audio and keying systems. A(P) This document also p
26、rovides definition, and methods of measurement for the transmit audio, receive audio, and push to talk interfaces for radio equipment used in the Private (Dispatch) Land Mobile Services. The definition and description of the system in which this equipment operates are given in the APCO Project 25 Sy
27、stem and Standards Definition, TINEIA-TSBI 02-A. 1.2 Functions The Mobile PTT Interface defines the following functions: I Function I Pin Abbreviation I 1.3 I Transmit Audio I AM I Not all of these functions will necessarily appear in all applications. Some applications will use only a subset of the
28、 available functions. Other applications may use all of the functions. All of these functions are defined for standard operation in this document Audio Within this document, the term audio is meant to describe audio that has been decoded in the Project 25 CAI and Vocoder digital modulation process,
29、or has been demodulated from a received analog modulated carrier. 1 TSB-102.CAAC 1.4 1.5 2. 2.1 2.2 2.3 Ap pl ica bi I i ty Not all mobile radio equipment meeting the Project 25 standards must include this interface. When the interface is provided on Project 25 compliant mobile radios, however, the
30、interface must adhere to the electrical and physical requirements found in this document. Refe re nces The following documents contain provisions that, through reference in this text, constitute provisions of this document. At the time of publication, the editions indicated were valid. All standards
31、 are subject to revision, and parties to agreements based on this document are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. ANSI and TIA maintain registers of currently valid national standards published by them. I Project 25 FDMA C
32、ommon Air Interface, ANSIITIAIEIA-I 02.BAAA-A, 2 APCO Project 25 System and Standards Definition, TIA/EIA-TSBI 02- 3 Digital C4FM/CQPSK Transceiver Measurement Methods, June 1999. A, November 1995. ANSIITIAIEIA-I 02.CAAA, June 1999. Physical Interface Standardization There is no attempt to standardi
33、ze the interface to a particular connector. Connector Location The connector is to be mounted on the rear of the radio for front mount radios, and on the rear of the control unit for remote mount radios, for ease of connection of the system cable. Securing Mating Connector The connector is to includ
34、e a securing method to mate the cable connector to the radio connector. 2 TSB-102.CAAC 2.4 Dedicated or Universal Connector This connector does not need to be separate and distinct for only this application. Other radio functions and uses may appear in the connector, but functions for this applicati
35、on must be universally available irrespective of radio programming. 3. Electrical Interface 3.1 Transmit Audio Interface 1. Transmit audio at this point is analog. 2. A(tx) is to be unbalanced to chassis ground. 3. A(tx) is to be a nominal low impedance. 3.2 Receive Audio Interface 1. Receive audio
36、at this point is analog. 2. A(rx) is to be unbalanced to chassis ground. 3. A(rx) is to be nominal low impedance. 4. A(rx) is to have a bandwidth of a minimum of 300 to 3400 Hz. 5. Whether the radio is receiving an analog or digital carrier, this point will have analog audio. 6. In the absence of a
37、carrier signal, this point shall have no more quiescent hum and noise than described in ANSI/TIA/EIA-603-A or 7. When receiving an analog carrier, subaudible tones are to be stripped off of this signal. ANS I/TIA/EIA-102.CAAB. 3.3 Push-to-talk Interface 1. PTT is to pull to ground to key on the tran
38、smitter. 3. The PTT electrical interface shall be isolated internally so that application of nominal DC voltages or ground potentials will not damage the radio circuits. 4. PTT is to have immunity from DC voltages from O to +50 volts that may be applied to the interface by the external system. 3.4 Q
39、ualified Audio Present Signal This is a standard option signal indicating that qualified audio is being presented by the receiver. 3 TSB-102.CAAC 3.5 4. 4.1 4.2 4.3 Chassis Ground Ground for all functions is to be connected to the device chassis. Standard Test Conditions Standard Definitions These a
40、re described in ANSIITIAIEIA 102.CAAA, clause 1.3. Standard Test Conditions These are described in ANSIITIAIEIA 102.CAAA, clause 1.4 Characteristics of Test Equipment These are described in ANSIITIAIEIA 102.CAAA, clause 1 5. 4 TSB-102.CAAC 5. Methods of Measurement 5.1 Methods of Measurement for Rec
41、eiver Interface This section details test definitions and methods of measurement of the characteristics of the digital land mobile receiver interface in vehicular (mobile) installations with or without encryption. 5.1 .I. Receiver Interface Audio Output The receiver interface audio output is the pow
42、er specified by the manufacturer that, under standard conditions, is available at the receiver interface when the latter is connected to a specified load. Method of Measurement a) Connect the equipment as illustrated. b) Apply a standard input signal, with the standard tone test pattern, at the stan
43、dard input signal level, to the receiver input terminals. c) Record the AC audio output level as VAUD. d) The manufacture shall specify the audio output voltage VAUD. e) Apply a standard input signal, with the Standard Silence Test Pattern, at the standard input signal level, to the receiver input t
44、erminals. f) Record the DC reading of the DMM as Voket. g) The manufacture shall specify the audio output voltage Voket. 5 TSB-102.CAAC 5.1.2. Residual Audio Noise Ratio The residual audio noise ratio is the ratio of the rated output power to the audio output power that results during voice silence
45、periods, and the audio output that results during the time when the receiver is muted. Method of Measurement Connect the equipment as illustrated. Apply a standard input signal, with the standard tone test pattern, at the standard input signal level, to the receiver input terminal. Adjust the receiv
46、er for rated audio frequency output power, and record the audio output level as VREF. Change the input signal to the standard silence test pattern. Measure the receiver audio output and record the level as VS. Remove the signal generator to mute the receiver and measure the receiver audio output. Re
47、cord this level as VMUTE. Calculate the residual audio noise ratio as follows: residual audio noise ratio (silence) = 20 logIO(VREF / VS) residual audio noise ratio (mute) = 20 loglo (VREF / Vmute) The manufacture shall specify the residual audio nose ratio for silence and mute conditions. 6 TSB-102
48、.CAAC 5.1.3. Qualified Audio Presence The qualified audio presence signal is a standard option signal that indicates that there is audio present on the receiver interface audio output that has been qualified by the radio by matching selected encryption, sub- audible connect tone, carrier detection,
49、fleet detection or other communications channel selection criteria Method of Measurement Qualified Audio Present a) Connect the equipment as illustrated. b) Apply a standard input signal, with the standard tone test pattern, at the standard input signal level, to the receiver input terminal. c) Measure the voltage at the qualified audio presence output record as VQA. d) The manufacture shall specify the VQA level and range. e) Remove the standard input signal. f) Measure the voltage at the qualified audio presence output record as VNQ. h) The manufacture shall
