Pub. 43004-010H
GAI-TRONICS® CORPORATION
A HUBBELL COMPANY
ITA2000A Series Tone Remote Adapter
with Scanning
User and Installation Manual
GAI-Tronics Corporation 400 E. Wyomissing Ave. Mohnton, PA 19540 USA
610-777-1374 800-492-1212 Fax: 610-796-5954
ISIT WWW.GAI-TRONICS.COM FOR PRODUCT LITERATURE AND MANUALS
V
*U.S. Patent 6,950,653
CONFIDENTIALITY NOTICE
This manual is provided solely as an operational, installation, and maintenance guide and contains
sensitive business and technical information that is confidential and proprietary to GAI-Tronics.
GAI-Tronics retains all intellectual property and other rights in or to the information contained herein,
and such information may only be used in connection with the operation of your GAI-Tronics product or
system. This manual may not be disclosed in any form, in whole or in part, directly or indirectly, to any
third party.
COMPUTER SOFTWARE COPYRIGHTS
This product contains copyrighted computer programs stored in semiconductor memory. These programs
are copyrighted by GAI-Tronics Corporation and may not be reproduced in any form without express
written permission from GAI-Tronics.
WARRANTY
GAI-Tronics warrants for a period of one (1) year from the date of shipment, that any GAI-Tronics equipment supplied hereunder
shall be free of defects in material and workmanship, shall comply with the then-current product specifications and product
literature, and if applicable, shall be fit for the purpose specified in the agreed-upon quotation or proposal document. If (a)
Seller’s goods prove to be defective in workmanship and/or material under normal and proper usage, or unfit for the purpose
specified and agreed upon, and (b) Buyer’s claim is made within the warranty period set forth above, Buyer may return such
goods to GAI-Tronics’ nearest depot repair facility, freight prepaid, at which time they will be repaired or replaced, at Seller’s
option, without charge to Buyer. Repair or replacement shall be Buyer’s sole and exclusive remedy, and the warranty period on
any repaired or replacement equipment shall be one (1) year from the date the original equipment was shipped. In no event shall
GAI-Tronics’ warranty obligations with respect to equipment exceed 100% of the total cost of the equipment supplied hereunder.
The applicability of any such third-party warranty will be determined solely by GAI-Tronics.
Services. Any services GAI-Tronics provides hereunder, whether directly or through subcontractors, shall be performed in
accordance with the standard of care with which such services are normally provided in the industry. If the services fail to meet
the applicable industry standard, GAI-Tronics will, for a period of one (1) year from the date of completion, re-perform such
services at no cost to the Buyer. Re-performance of services shall be Buyer’s sole and exclusive remedy, and in no event shall
GAI-Tronics’ warranty obligations with respect to services exceed 100% of the total cost of services provided hereunder.
Limitations/Exclusions. The warranty on any equipment supplied hereunder is subject to Customer’s use in compliance
with applicable FCC regulations and manufacturer specifications. The warranties herein shall not apply to, and GAI-Tronics
shall not be responsible for, any damage to the goods or failure of the services supplied hereunder, to the extent caused by
accident, misuse, abuse, neglect, system design, product modification, failure to follow instructions contained in the product
manual, repair, or attempted repair by anyone not authorized by GAI-Tronics, improper installation, installation of parts that do
not conform to the quality or specifications of the original parts or accessories, damage or loss occurred during shipment, or any
unit which is not new when sold or upon which the serial number has been defaced, modified or removed. The warranty does not
extend to damage incurred by natural causes including Force Majeure. The warranty does not cover microprocessors if failure is
due to static damage or application of improper voltage.
THE WARRANTIES AND REMEDIES CONTAINED
HEREIN ARE IN LIEU OF AND EXCLUDE ALL OTHER WARRANTIES AND REMEDIES, WHETHER
EXPRESS OR IMPLIED BY OPERATION OF LAW OR OTHERWISE, INCLUDING ANY WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Operational and Maintenance Procedures. Buyer acknowledges that any improper use, maintenance, or
modification of the equipment provided hereunder, or use of unqualified maintenance or service technicians will severely impair
the operational effectiveness of the entire communication system. Buyer hereby agrees to indemnify, defend and hold GAITronics harmless from and against any and all third party claims arising, in any manner, out of: (a) Buyer’s neglect of the
equipment; (b) Buyer’s use of technicians not authorized by GAI-Tronics to service the equipment; or (c) Buyer’s improper use
or modification of the equipment or failure to follow the operational and maintenance procedures provided with the equipment.
Limitation of Liability/Damages. In no event (even should circumstances cause the exclusive warranties and remedies
set forth in the Warranty section to fail of their essential purpose) shall either party be liable for any indirect, incidental, special
or consequential damages (including, but not limited to, loss of use, loss of anticipated profits, or damages arising from delay)
whether such claims are alleged to have arisen out of breach of warranty, breach of contract, strict or absolute liability in tort, or
other act, error or omission, or from any other cause whatsoever, or any combination of the foregoing.
Motorola and MAXTRAC are trademarks of Motorola, Inc.
03/13 Publication 43004-010H i
Table of Contents
FOREWORD ............................................................................................................................................................... 1
SCOPE OF MANUAL .................................................................................................................................................... 1
NOMENCLATURE ........................................................................................................................................................ 1
ORDERING REPLACEMENT PARTS .............................................................................................................................. 1
SERVICE AND REPAIR ................................................................................................................................................. 1
FCC INTERFERENCE WARNING .................................................................................................................................. 1
SAFE HANDLING OF CMOS INTEGRATED CIRCUIT DEVICES ...................................................................................... 2
DESCRIPTION............................................................................................................................................................ 3
FEATURES AND BENEFITS OF THE ITA2000A TONE REMOTE ADAPTER..................................................................... 3
ADDITIONAL FEATURES AND BENEFITS OF THE ITA2000A TONE REMOTE ADAPTER IN SCAN MODE ....................... 4
PRODUCT OVERVIEW ................................................................................................................................................. 5
ITA2000A ACCESSORIES ........................................................................................................................................... 5
SPECIFICATIONS ......................................................................................................................................................... 6
OPERATION ............................................................................................................................................................... 7
FRONT PANEL LED OPERATION ................................................................................................................................. 7
PWR LED .......................................................................................................................................................................... 7
PTT LED ............................................................................................................................................................................ 7
MON/SCAN LED .............................................................................................................................................................. 7
CSQ LED ........................................................................................................................................................................... 7
ACC PTT LED ................................................................................................................................................................... 7
SUPERVISOR LED ........................................................................................................................................................... 7
SUPERVISOR BUTTON ................................................................................................................................................. 8
DESK MICROPHONE PORT .......................................................................................................................................... 8
Desk Microphone Port Pinout .............................................................................................................................. 8
TONE CONTROL INTERFACE ....................................................................................................................................... 9
Scan Start/Stop in the Scan Mode ....................................................................................................................... 10
Radio Monitor in Scan Mode .............................................................................................................................. 10
SUPERVISOR MODE .................................................................................................................................................. 11
ACCESSORY OPERATION .......................................................................................................................................... 11
TEST MODE .............................................................................................................................................................. 12
INSTALLATION ....................................................................................................................................................... 13
PLANNING THE INSTALLATION .................................................................................................................................. 13
MOUNTING ............................................................................................................................................................... 13
EQUIPMENT REQUIRED ............................................................................................................................................. 14
Test Equipment ................................................................................................................................................... 14
Documentation .................................................................................................................................................... 14
CABLE INSTALLATION SAFETY CONSIDERATIONS..................................................................................................... 14
TELEPHONE LINE LIGHTNING AND OVER-VOLTAGE PROTECTION............................................................................. 14
POWER CONNECTIONS.............................................................................................................................................. 15
CONVENTIONAL TO SCANNING OPERATION CONVERSION ........................................................................................ 16
RADIO CONNECTOR (J2)........................................................................................................................................... 17
Input/Output Radio Connector Table ................................................................................................................. 17
ACCESSORY CONNECTOR (J3) .................................................................................................................................. 20
Input/Output Accessory Connector Table ........................................................................................................... 20
ITA2000A to Kenwood TK-790/890 Series Radio Connection Chart ................................................................. 21
ITA2000A to RPG Radio Connection Chart ....................................................................................................... 23
ITA2000A Tone Remote Adapter to MCS2000 Radio Connection Chart (Conventional Mode Only) ............... 24
03/13 Publication 43004-010H ii
Table of Contents ITA2000A Series Tone Remote Adapter
RADIO TIE LINE (TELEPHONE) CONNECTIONS .......................................................................................................... 25
Analog Facility Interface Codes ......................................................................................................................... 25
Telephone Line Connection Table ...................................................................................................................... 25
JUMPERS .................................................................................................................................................................. 26
Jumper Table ...................................................................................................................................................... 26
CHANNEL REVERT (CONVENTIONAL MODE ONLY) .................................................................................................. 27
Channel Revert Settings Table ............................................................................................................................ 27
CONFIGURATION SWITCH SETTINGS FOR CONVENTIONAL MODE OPERATION .......................................................... 28
Switch Settings for SW1 (Conventional) ............................................................................................................. 28
Switch Settings for SW2 (Conventional) ............................................................................................................. 29
CONFIGURATION SWITCH SETTINGS FOR SCAN MODE OPERATION ........................................................................... 30
Switch Settings for SW1 (Scan) ........................................................................................................................... 30
Switch Settings for SW2 (Scan) ........................................................................................................................... 31
LEVEL SETTINGS AND ADJUSTMENTS ....................................................................................................................... 32
Receive Audio Level ............................................................................................................................................ 32
Line Output Level ................................................................................................................................................ 32
Transmit Audio Level .......................................................................................................................................... 33
TEST DIAGNOSTICS .................................................................................................................................................. 34
THEORY OF OPERATION .................................................................................................................................... 35
TECHNICAL OVERVIEW ............................................................................................................................................ 35
Transmit Audio ................................................................................................................................................... 35
Radio Audio ........................................................................................................................................................ 35
Accessory Transmit ............................................................................................................................................. 36
Desk Mic Transmit .............................................................................................................................................. 36
Reset Circuit ....................................................................................................................................................... 36
TROUBLESHOOTING ............................................................................................................................................ 37
TROUBLESHOOTING THE ITA2000A TONE REMOTE ADAPTER ................................................................................ 37
FUSE REPLACEMENT ................................................................................................................................................ 38
MAIN CIRCUIT BOARD ........................................................................................................................................ 39
SCHEMATICS .......................................................................................................................................................... 41
DEFINITIONS AND ACRONYMS ......................................................................................................................... 49
03/13 Publication 43004-010H iii
Foreword
Scope of Manual
This manual offers descriptive data and service information for the ITA2000A Tone Remote Adapter
with Scanning. The unit is shipped as a conventional tone remote adapter but can easily be converted to
a scanning tone remote adapter with a simple switch setting change. Please refer to the switch settings
located in the Installation section of this manual.
Nomenclature
The model number, located on the nameplate on the bottom, specifically identifies GAI-Tronics
equipment. If additional options are ordered, the option will be identified on the circuit board.
Many ITA2000A features are the same in both Conventional and Scan modes. If a feature is particular to
either mode, the mode will be identified.
Ordering Replacement Parts
When ordering replacement parts or requesting equipment information, please include the complete
identification number. This applies to all components, kits, and chassis. If the component part number is
not known, the order should include the number of the chassis or kit of which it is a part and sufficient
description of the desired component to identify it. Order parts from:
Customer Service
GAI-Tronics Corporation
400 E. Wyomissing Ave.
Mohnton, PA 19540
US: 800-492-1212
Outside US: 610-777-1374
Service and Repair
Inoperative or malfunctioning equipment should be returned to the factory for repair. Please call
1-800-492-1212 to obtain a Return Authorization number, published repair prices, and shipping
instructions. A Return Authorization can also be obtained by visiting our website at
www.gai-tronics.com.
OTE: A purchase order or credit card number is required prior to processing non-warranty repairs.
N
FCC Interference Warning
The FCC requires that manuals pertaining to Class A and Class B computing devices must contain
warnings about possible interference with local residential radio and TV reception. This warning reads
as follows:
NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to
Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference
when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful
interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful
interference in which case the user will be required to correct the interference at his own expense.
1 03/13
Foreword ITA2000A Series Tone Remote Adapter
Safe Handling of CMOS Integrated Circuit Devices
Many of the integrated circuit devices used in communications equipment are of the Complementary
Metal Oxide Semiconductor (CMOS) type. Because of their high open circuit impedance, CMOS
integrated circuits are vulnerable to damage from static charges. Care must be taken handling, shipping,
and servicing them and the assemblies in which they are used.
Even though protection devices are provided in CMOS integrated circuit inputs, the protection is
effective only against overvoltage in the hundreds of volts range such as is encountered in an operating
system. In a system, circuit elements distribute static charges and load the CMOS circuits, decreasing the
chance of damage. However, CMOS circuits can be damaged by improper handling of the modules, even
in a system. To avoid damage to circuits, observe the following handling, shipping, and servicing
precautions:
1. Prior to and while servicing a circuit module, particularly after moving within the service area,
momentarily touch both hands to a bare metal, earth-grounded surface. This will discharge any static
charge that may have accumulated on the person doing the servicing.
N
OTE: Wearing a conductive wrist strap will minimize static build-up during servicing.
2. Whenever possible, avoid touching any electrically conductive parts of the circuit module with your
hands.
3. Power down the unit before installing or removing the circuit module.
4. When servicing a circuit module, avoid carpeted areas, dry environments, and certain types of
clothing (silk, nylon, etc.) because they contribute to static build-up. Similarly, disconnect the test
probe prior to removing the ground lead.
5. All electrically powered test equipment should be grounded. Apply the ground lead from the test
equipment to the circuit module before connecting the test probe.
6. If a circuit module is removed from the system, it is desirable to lay it on a conductive surface (such
as a sheet of aluminum foil) which is connected to ground through 100k of resistance.
7. When soldering, be sure the soldering iron is grounded and has a grounded tip.
8. Prior to connecting jumpers, replacing circuit components, or touching CMOS pins (if this becomes
necessary in the replacement of an integrated circuit device), be sure to discharge any static build-up
as described in procedure 1. Since voltage differences can exist across the human body, it is
recommended that only one hand be used if it is necessary to touch pins on the CMOS device and
associated board wiring.
9. When replacing a CMOS integrated circuit device, leave the device in its conductive rail container or
conductive foam until it is to be inserted into the printed circuit module.
10. All low impedance test equipment (such as pulse generators, etc.) should be connected to CMOS
device inputs after power is applied to the CMOS circuitry. Similarly, such low impedance
equipment should be disconnected before power is turned off.
11. Replacement modules shipped separately from the factory will be packaged in a conductive material.
Any modules being transported from one area to another should be wrapped in a similar material
(aluminum foil may be used). Never use non-conductive material for packaging these modules.
03/13 2
Features and Benefits of the ITA2000A Tone Remote Adapter
Feature Benefit
Description
Adjustable receive input
sensitivity and transmit output
level
Allows flexibility with different radio systems and user
environments, where radio output levels, line losses, and noise
factors vary.
Autolevel Reduces the need for site visits to adjust audio pots. Mobiles
receive consistently high receive sound level, with fewer repeat
requests.
Selectable input/output logic
control
All inputs/outputs can be individually selected to go active high or
to ground, depending on the radio, offering compatibility with many
radio systems.
Full-duplex capable with 2- or
4-wire
With 2-wire capable desk set (such as an ITR2000A), gives fullduplex operation for use with most full-duplex and trunking radio
systems.
Modular telephone line
Easy-to-install telephone line cable.
connection on back
Selectable timed or continuous
monitor
2
Flexible monitoring option.
Multiple parallel desk set support System flexibility and productivity are enhanced when several desk
sets are connected.
16-channel control1 Each of the five-channel steer outputs can be used to change
channels and other functions on certain radios.
Courtesy tones Sends a tone to the desk set when a mobile has stopped transmitting.
Selectable 2175 Hz guard tone
2
keying
High and low level guard tones and function tones are sent in
applications where tones are needed. (e.g. wireless phone line
extension).
Supervisor control Allows the dispatcher at the ITA2000A to override remote desk sets
and accessory.
Front panel mic jack Allows dispatch control with desk microphone, headset, handset,
etc.
Accessory port Allows connection of other devices, such as a local desk set or
telephone interconnect.
1
16-channel control is available only when configured for Conventional mode. When configured for
Scan mode, only 15-channel control is available.
2
Available only when configured for Conventional mode.
3 03/13
Description ITA2000A Series Tone Remote Adapter
Additional Features and Benefits of the ITA2000A Tone Remote Adapter in
Scan Mode
Feature Benefit
Adds scanning capability to
conventional multi-channel
Enhances radio functionality by using channel steering capability of
both non-scanning and scanning radios. Reduces overall system cost.
radios
Scanning of up to 15
frequencies
Allows remote scanning and
radio control from multiple
dispatch points
Flexible scanning
configuration
A single multi-channel radio can remotely monitor multiple frequencies,
reducing the number of radios required for dispatch applications.
Using regular leased lines, multiple dispatchers can monitor and control
scanning capability. Each dispatch point displays currently active
receive channel.
Number of channels, scan rate, scan-stop time, and scan resume can all
be easily configured using readily accessible DIP switches.
Talk-back scanning Allows dispatcher to transmit on last active receive channel.
Remote scan on/off Scanning can be remotely turned on or off. Properly equipped parallel
dispatch devices are updated with the status.
15-channel control Each of the five channel steer outputs can be used to change channels
and other functions on certain radios.
03/13 4
ITA2000A Series Tone Remote Adapter Description
Product Overview
The ITA2000A Tone Remote Adapter uses a state-of-the-art digital signal processor (DSP) to ensure
highly accurate and fast tone encoding/decoding and audio filtering. It allows a radio to be remotely
controlled through dedicated, leased telephone lines or in-house wiring using standard EIA tone keying
sequences.
The advantages include flexible configuration, front panel controls and status indicators for set-up
convenience, automatic level control (ALC), and a dispatcher/service mic jack. It is compact, measuring
7.03 W 6.3 L 1.5 H inches, and supports full-duplex or simplex, 2- or 4-wire desk set stations. The
ITA2000A has an accessory connector that supports local control devices, such as a telephone
interconnect, extended local desk set, or a secondary radio.
Using GAI-Tronics’ ITR2000A or IPE2500A Tone Remote Desk Set, the ITA2000A programmed for
Scan mode (using patented techniques), adds tone remote scanning and scan start/stop capability to
conventional, multi-channel, steering-capable radios. Dispatch points are updated using these techniques
through the use of the parallel status update feature found in the GAI-Tronics Model ITR2000A and
IPE2500A Desk Sets.
To accommodate radios that vary in their active input logic, the ITA2000A can be set up to provide
discrete active output logic functions. Active low or active high outputs can be set for each radio and
accessory Channel Selection Output, Monitor, Push-to-Talk, Push-to-Talk Sense, and CSQ Detect.
ITA2000A Accessories
Description Part No.
GM300/MAXTRAC or Motorola GR1225 Radio Interface Cable 61531-007
Kenwood Radio Interface Cable (KCT-19) 61531-004
Radio Interface Cable (bare leads), 3-foot (included with unit) 97C160-0003
Power Supply, 100-240 V ac/12 V dc1 40419-008
Power Supply Adapter, European 40420-001
Power Supply Adapter, UK 40420-002
Power Supply Adapter, Australia 40420-003
Power Supply Adapter, Korea 40420-004
Fuse, F2, (Telco line only) Bussmann C515S 1.25A 4612-23015-25
Fuse, F1, (Power) Bussmann Type GMA-1A 4612-23500-01
Dual 19-inch Rack Mount, 1.75-inch high (Can hold two ITA2000A
units.)
1
Power (12 V dc) may be obtained directly from the controlled radio. A local power supply, if required,
must be ordered separately.
XAC0005A
5 03/13
Description ITA2000A Series Tone Remote Adapter
Specifications
Color ...................................................................................................................................................... Black
Physical size ................................................................................................... 7.03 W 6.3 L 1.5 H inches
Weight .................................................................................................................................................... 4 lbs.
Temperature range ................................................................................................................. −30º C to 70º C
Humidity .................................................................................................................................... 95% at 50º C
Input power (main or aux.) .................................................................... 10.5 to 16 V dc; 100 mA maximum
Frequency response............................ +
Hum and noise ..................................................................................... More than -45 dB below rated output
Line audio input ........................... Microprocessor automatically compensates for line loses of up to 24 dB
Audio distortion ............................................................................................................... Less than 3% THD
RX input ............................................................. 32 mV ac to 4.5 V ac into 600 ohms (nominal 300 mV ac)
TX input ........................................................... 32 mV ac to 800 mV ac into 600 ohms (nominal 80 mV ac)
Line input ........................................................... −25 dBm to 0 dBm AGC to reference (nominal −10 dBm)
Line output ......................................... −15 dBm to +10 dBm adjustable into 600 ohms (nominal −10 dBm)
Logic outputs ........................................................................ PTT, CH-STEER; 20 mA, 100 mW dissipated
Maximum number of desk sets supported (practical limit) ........................................................................ 10
Microphone connections ..................................................................................................... Desk microphone
Input tone tolerance ................................................................................................................................. +
Safety .................................................................................................... Class III SELV powered equipment.
Powered by optional UL-listed (E104603)
and CSA certified (LR67888) ac adapter.
EMI ................................................................................................. USA: FCC Part 15, Sub. B-Verification
Canada: ICES-003
Line Interface ......................................................................... FCC Part 68 Exempt (Category II Tariff #260
service for private/leased line applications)
IC: Designed to meet CS03-8. (Cert. Pending)
Category: Voice-band metallic private line channel interface.
3 dB, 300 to 3000 Hz (except TX and RX audio notch at 2175 Hz)
2%
F1
F2
F3
F4
1
Scan operation only
2
Conventional operation only - Monitor/F16 is switch-selectable. See the programmable switch settings
1950 Hz
1850 Hz
1750 Hz
1650 Hz
F5
F6
F7
F8
in the “Installation” section of this manual.
03/13 6
1550 Hz
1450 Hz
1350 Hz
1250 Hz
F9
F10
F11
F12
1150 Hz
1050 Hz
950 Hz
850 Hz
F13
F14
F15
Scan Start/Stop1
or,
Monitor/F162
750 Hz
650 Hz
550 Hz
2050 Hz
Front Panel LED Operation
PWR LED
Operation
ITA2000
Front View of the ITA2000A
The PWR LED illuminates to indicate that the ITA2000A power is on and the DSP is operating.
PTT LED
The push-to-talk LED, labeled PTT, illuminates when a valid transmit request has been decoded or the
mic PTT is actuated.
MON/SCAN LED
Conventional: The timed or constant monitor LED, labeled MON, illuminates when the ITA2000A is in
the monitor mode.
Scan: The SCAN LED blinks at the scan rate when the ITA2000A is scanning, and is lit steadily when in
monitor mode.
CSQ LED
The CSQ LED illuminates when a carrier detect input is active.
ACC PTT LED
The ACC PTT LED illuminates when the accessory PTT input is active.
SUPERVISOR LED
The SUPERVISOR LED illuminates when the ITA2000A is placed into supervisor mode.
7 03/13
Operation ITA2000A Series Tone Remote Adapter
Supervisor Button
The SUPERVISOR button with the associated LED indicator provide full dispatcher control of the radio
system. This button is used to enter the supervisor mode or the test mode. Refer to the Operation section
for more information.
Desk Microphone Port
The front panel desk microphone port (MIC), is an 8-pin modular connector that supports an external
connection for local dispatch control. (Possible accessories include desk, gooseneck, or boom
microphones, or a headset or footswitch via the GAI-Tronics XAAB002A Audio Accessory Box).
Audio from this microphone is routed to the station transmit and receive audio and the telephone line
while push-to-talk is applied from the external microphone. The front-panel mic audio does not have a
guard tone notch applied. Station receive audio is also provided at the
allows a handset or similar device to be used in place of a desk microphone.
An external microphone monitor function places the ITA2000A in the monitor mode while asserting
PL/DPL disable at the radio connector. The microphone input type is passive, with an input impedance
of less than 2 k and a nominal input level of −20 dBm. The GAI-Tronics XDM004A Desk Microphone
is an acceptable example.
MIC connector. This feature
Desk Microphone Port Pinout
Pin No. Function
1 B+ OUT (through 10 ohms)
2 N/C
3 Monitor IN (closure to ground)
4 AGND
5 Mic IN (with bias voltage)
6 PTT IN (closure to ground)
7 N/C Desk Mic Port Pinout
8 RX audio OUT (handset audio)
03/13 8
ITA2000A Series Tone Remote Adapter Operation
The rear view of the ITA2000A shows the line, accessory, radio, and power connector locations. Also
shown are the
TX and RX level adjustment pots, and the location of the internal fuse.
RX
DC POWER
INTERNAL
FUSE
13.8VDC
0.3A
LINE
ACCESSORY
RADIO
LEVEL
TX
Rear View of the ITA2000A
Tone Control Interface
The ITA2000A decodes standard EIA tone keying control tones for controlling the radio system. The
control tone convention can be seen below.
Standard EIA Tone Control Sequence
The function tone frequency ranges from 550 Hz to 2050 Hz in 100 Hz increments. 2050 Hz represents
monitor in Conventional mode and scan start/stop in Scan mode, 1950 Hz for F1, 1850 Hz for F2 down
to 550 Hz for F15.
When scanning and carrier is detected, a similar tone sequence is generated to the phone line where
HLGT is generated for 40 ms followed by a 20 ms function tone representative of the current channel.
This tone sequence will be decoded by desk sets capable of fast parallel status update, such as the GAITronics ITR2000A and IPE2500A. The use of products that are not capable of decoding this fast tone
sequence is not advisable, as the reliability of the operator information may be less than desirable.
9 03/13
Operation ITA2000A Series Tone Remote Adapter
Scan Start/Stop in the Scan Mode
Upon power-up, the ITA2000A will automatically start scanning. While in scan mode, the ITA2000A
asserts, in sequence, the channel steer pins at the configured scan rate. Upon detection of carrier, the unit
stops scan and generates the appropriate tone sequence to the phone line. Upon loss of carrier, the unit
resumes scan after the configured scan stop time, or until manually started by that attached desk set,
depending on the configuration of the unit. When the unit resumes scan, a monitor function tone burst is
generated indicating to the attached desk sets that scan has resumed. If the operator wishes to stop the
scan resume before the scan stop time expires, the scan should be stopped using the scan stop feature.
The ITA2000A supports a remote scan start/stop toggle feature via the monitor function tone or 2050 Hz.
Pressing the desk set
MONITOR button causes a 2050 Hz tone sequence to be generated. When in scan
mode, if a valid 2050 Hz tone sequence is decoded, the unit stops scan on the current scan channel and
generates a tone burst to the phone line indicating to the attached desk set(s) the channel on which the
scan was stopped.
Likewise, when not in scan mode, if a valid 2050 Hz tone sequence is detected, the unit will resume scan.
The decoding of this 2050 Hz tone sequence by parallel desk sets indicates that scan has been resumed.
While in scan mode, if a channel steer is done by the desk set, the unit will cease scan. If the unit is
configured to resume scan after PTT, the unit will do so after the first PTT from the desk set. If the
operator wishes to remain on the channel indefinitely, scan must be stopped prior to issuing the channel
steer.
Radio Monitor in Scan Mode
The ITA2000A does not use a monitor function tone for assertion of monitor that may be required in
some installations, when in scan mode. To place the ITA2000A into monitor mode, the desk set must
force a channel steer to the desired channel by generating the appropriate function tone burst. This
causes the ITA2000A to stop scan and assert the PL/DPL disable output to the radio placing the radio in
monitor mode. When in this mode, the SCAN LED is lit. Subsequent transmissions by the desk set will
cause this assertion to be cleared until the desk set, again, generates an appropriate function tone burst.
An example of this operation using an IPE2500A Tone Remote Desk Set is as follows:
1. While scanning, the desk set operator wishes to transmit on channel 3. Before doing so, the operator
must ensure that the channel is clear by placing the radio in monitor mode on channel 3. The
operator presses the “3” key on the IPE25000A causing the desk set to generate a tone burst
consisting of HLGT followed by a function tone of 1750 Hz. Note that no low-level guard tone is
generated. The ITA2000A stops scan, switches to channel 3, asserts the PL/DPL output placing the
radio in monitor mode, and lights the SCAN LED.
2. The operator monitors the channel for activity and, upon assuring there is none, presses the
TRANSMIT key on the IPE2500A. The desk set generates a tone burst of HLGT followed by a
function tone of 1750 Hz, which is followed by LLGT. The ITA2000A asserts the radio PTT, clears
the assertion of the PL/DPL output and extinguishes the SCAN LED.
3. The operator releases the
radio. The ITA2000A does not
TRANSMIT key on the IPE2500A and the ITA2000A releases PTT from the
reassert the PL/DPL output to the radio. The operator carries on a
conversation with the field unit normally. If the unit is configured to resume scan after PTT, the unit
will do so after the scan-stop time has passed upon releasing PTT unless scan was halted prior to the
transmission.
4. If the operator wishes to again place the radio in monitor mode on channel 3, he must press the “3”
key again. The ITA2000A will decode the tone burst and place the radio into monitor mode as in
number 1 above.
03/13 10
ITA2000A Series Tone Remote Adapter Operation
Supervisor Mode
The ITA2000A is placed in the supervisor mode by pressing the SUPERVISOR button for less than four
seconds, or by pressing either the MONITOR or PTT buttons of an attached desk-mic accessory. This
feature can be disabled in Conventional mode. When supervisor mode is entered, the SUPERVISOR
LED illuminates and the ITA2000A enters home-mode state. This is useful when a dispatcher needs to
disable control of the radio from all desk set operators and the accessory input. Pressing the
SUPERVISOR button again for less than four seconds is the only method used to exit supervisor mode
and return the ITA2000A to normal operation.
In the home-mode state, the ITA2000A clears all channel steer lines to the radio and generates
continuous guard tone to the phone line. In addition, the ITA2000A ceases scanning if in Scan mode.
The generation of guard tone serves two purposes. First, all LOTL-equipped desk sets such as the
ITR2000A or IPE2500A connected to the ITA2000A will recognize the base station is now in use and
will effectively lock out any operations. Second, when using the Scan mode, the generation of the guard
tone will clear the scan (monitor) indicator of these connected desk sets indicating that scan has stopped.
When home-mode is exited, the ITA2000A returns to the previously selected channel, or if in Scan mode,
returns to the previous scan state. If scan were active prior to entering the home-mode state, the
ITA2000A returns to scan upon exiting home-mode state and generates a tone burst to the phone line to
update the connected desk sets appropriately. If scan were not active prior to entering home-mode state,
the ITA2000A will not resume scan upon exiting home-mode state.
Accessory Operation
The ITA2000A includes an accessory connector to allow access to the radio from other devices such as
an ILD1000A Local Control Desk Set, a PL1877A Telephone Interconnect, or an additional ITA2000.
With such devices, control of the radio is limited to monitor and PTT. When an accessory device
requires access to the radio, it will assert the appropriate input on the accessory connector. When this
assertion is detected, the ITA2000A enters home-mode state. This feature can be disabled when in
Conventional mode.
When an accessory asserts the accessory monitor input, the ITA2000A enters home-mode state. When
the accessory releases the accessory monitor input, the ITA2000A exits home-mode state. If in Scan
mode, the ITA2000A resumes scan after the scan stop time if scan were active prior to the assertion of
the accessory monitor input.
When the accessory asserts the accessory PTT input, the ITA2000A enters home-mode state for the
duration of the assertion when in Scan mode. When the accessory releases the accessory PTT input,
Conventional mode exits home-mode state, and Scan mode immediately returns to the previous scan
state.
11 03/13
Operation ITA2000A Series Tone Remote Adapter
Test Mode
To enter the test mode, press the SUPERVISOR button for more than four seconds. All LEDs illuminate
for two seconds indicating the ITA2000A has entered the test mode.
While the ITA2000A is in test mode, pressing the
SUPERVISOR button momentarily (less than four
seconds) causes the ITA2000A to step up to the next test.
WARNING
Disconnect the ITA2000A from the radio and disconnect all accessories from the ITA2000A when
performing Diagnostic Tests 2, 3, and 4. These diagnostics are used for factory testing only and
perform input/output configuration tests that may damage the interface to the radio and/or any
accessories connected to the ITA2000A.
Pressing the button again for at least four seconds
takes the ITA2000A out of the test mode.
03/13 12
Planning the Installation
Installation
Typical ITA2000A Installation
Mounting
The ITA2000A Tone Remote Adapter can be installed in a customer-supplied rack or cabinet, or can be
placed on a desk for convenience when used with microphones and other accessories. A 19-inch
standard rack panel, 1.75 inches high, is also available. The GAI-Tronics part number is XAC0005A.
13 03/13
Installation ITA2000A Series Tone Remote Adapter
Equipment Required
Test Equipment
RF service monitor, or Communications Service Analyzer such as the Motorola R-2600 with
RTL-1003A transformer
audio ACVM
multimeter or VOM
#1 Phillips screwdriver
8-pin modular plug with 'pigtail' leads
Documentation
this installation manual
associated radio installation/technical manual
service monitor manual
Cable Installation Safety Considerations
Interconnecting, communications, and Class 2 dc power cables should be separated from electrical light
or other Class 1 circuit by at least 2 inches. The exception is where Class 1 wiring or power circuits are
run in a raceway, or are metal-sheathed or metal–clad, or are permanently separated from the conductors
of the other circuitry by a continuous and firmly fixed nonconductor, such as porcelain tubes or flexible
tubing, in addition to the insulation on the wire.
Communications cables and in-building wiring should be listed and marked for the purpose according to
NEC Article 800. Optional cabling kits comply with these requirements and are recommended.
Telephone Line Lightning and Over-voltage Protection
The ITA2000A employs over-current phone line fuses F1 and F2. These fuses protect against occasional
extreme fault conditions that may get past the primary protectors. An example of a fault condition is a
power line cross. If these fuses ever require replacement, replace F1 or F2 only with the same type
Bussmann C515S 1.25A fuse.
For maximum surge and lightning protection, building primary (over-voltage) protectors must be
installed at the point where the phone lines enter the radio equipment building. Primary protectors are
usually required by local codes and should be provided by your leased line provider.
03/13 14
ITA2000A Series Tone Remote Adapter Installation
Power Connections
The ITA2000A is supplied with a dc power cable. Plug the cable’s DIN connector into the dc power
receptacle on the rear of the unit. Connect the red lead to the positive terminal and the black lead to the
negative terminal of the station’s dc power supply. This supply must be capable of supplying the 0.3 A
current required by the ITA2000A.
The ITA2000A operates properly on input voltages from 10.5 to 16 V dc. The optional 40419-008
UL-listed/CSA-certified Class 2 ac wall transformer should be used if a suitable dc source such as the
station’s dc supply is not available. The power connection pinout is as follows:
Pins Function
Pin 1 –IN
Pin 2 N/C
Pin 3 +IN
Pin 4 –IN
Pin 5 +IN
CAUTION
For safe operation, use only a listed or certified Class 2 ac adapter.
15 03/13
Installation ITA2000A Series Tone Remote Adapter
Conventional to Scanning Operation Conversion
NOTE: The ITA2000A includes an LED labeled MON (top) and SCAN (bottom). It is the third LED
from the left when looking at the unit from the front. In Conventional mode, the LED indicates monitor
operation. In Scan mode, the LED will flash at the scan rate and illuminates steadily when the adapter
locks onto a channel (monitor).
Locate SW1-7 on the unit’s front panel, and place it in the down position.
The unit will perform a reboot and begin operation in the Scan mode. When the unit is powered up or
when exiting diagnostics, the hybrid balance tone will be heard twice. This will not cause any harm to
the system.
N
OTE: The scan or scanning features of the radio must not be programmed or selected. The ITA2000A
will not function properly if the radio is programmed with scan functions.
03/13 16
ITA2000A Series Tone Remote Adapter Installation
Radio Connector (J2)
The radio connector is located on the rear of the ITA2000A. The connector pinout appears below:
Input/Output Radio Connector Table
Pin
J2-1 Black/
J2-2 Blue/
Wire
Color Description
Channel Steer 3 O JU4 B position = Lo (0 V dc)*
white
CSQ Detect (SW1-1 must be
white
Down) Refer to Switch
Input/
Output Range
JU4 A position = Hi (B+)
I SW1-2 UP = Lo (0 V dc)*
SW1-2 DOWN = Hi (B+)
Table.
J2-3 Green RX Audio + (Selectable)
300 mV
RMS nominal/default
I Range 1: −20 dB Jumper = OUT
32 mV
RMS–1.6 VRMS
Range 2: −20 dB Jumper = IN
1.5 V
RMS–4.5 VRMS
J2-4 Black AGND
J2-5 White/
black
Channel Steer 2 O JU5 B position = Lo (0 V dc)*
JU5 A position = Hi (B+)
J2-6 White PTT O JU2 B position = Lo (0 V dc)*
JU2 A position = Hi (B+)
J2-7 Orange RX PL Disable O Closure between pins 7 and 14
J2-8 Red Channel Steer 0 O JU7 B position = Lo (0 V dc)*
JU7 A position = Hi (B+)
J2-9 Red/
white
J2-10 Green/
white
Channel Steer 4 O JU3 B position = Lo (0 V dc)*
JU3 A position = Hi (B+)
CSQ and CTCSS Detect
(SW1-1 must be Down.)
I SW1-2 UP = Lo (0 V dc)*
SW1-2 DOWN = Hi (B+)
Refer to Switch Table.
J2-11 Green/
Black
RX Audio – (AGND) I Connected internally to pin 4 at radio
end of cable.
J2-12 Blue TX Audio O 32 mVRMS–800 mVRMS 560 ohms
J2-13 Blue/
black
J2-14 Orange/
PTT Sense I SW1-3 UP = Lo (0 V dc)*
SW1-3 DOWN = Hi (B+)
RX PL Disable O Closure between pins 7 and 14
black
J2-15 Red/
black
Channel Steer 1 O JU6 B position = Lo (0 V dc)*
JU6 A position = Hi (B+)
*default from the factory
17 03/13
Radio Connector Pinout
Installation ITA2000A Series Tone Remote Adapter
Transmit Audio – Pin 12
Connect this single-ended output to a microphone input circuit or exciter input of the transmit section.
The radio should be capable of a level from 32 mV
to 800 mV
RMS
RMS
.
Receive Audio – Pin 3 RX High (+), Pin 11 RX Low (−)
Connect to a speaker or detector audio source from a radio receiver capable of supplying a level in the
range of 250 mV
N
OTE: It is best to connect to a point not controlled by a volume potentiometer to avoid the receive
RMS
to 4.5 V
. Ensure that SW2-1 is set properly.
RMS
audio being affected by someone adjusting the volume control.
If connecting to a volume potentiometer, connect to the high side so the level can not be changed.
Connect pin 11 to audio ground (AGND) if a receive return is not provided. Pin 11 should be shorted
with Pin 4 on the radio connector.
Push-to-Talk (PTT) Output – Pin 6
This output must be connected to a point in the radio that causes it to transmit when active. When this
input on the radio is active, ensure that the microphone input circuit where the transmit audio of the desk
set (pin 12) is connected will be active also.
Monitor – Pin 7, Pin 14
These pins provide a closure output for receive PL/DPL disable (monitor), and is activated when the
ITA2000A decodes a function tone of 2050 Hz from a tone remote desk set when in Conventional mode.
These pins are activated by a channel steer sequence until a PTT or scanning is resumed in Scan mode.
Connect to the radio receive PL/DPL disable input so the radio will go into carrier squelch mode. Since
this connection is a closure, one side of the closure can be connected to B+ or ground, depending on the
desired activation function logic. If receive PL/DPL disable is not supported by the radio, or is not
desired, disregard this connection.
Carrier Detect Input – Pin 2
The ITA2000A can be set up to accept an active low or high logic level for routing radio audio to
accessory and remotes when carrier is detected. Connect pin 2 to a radio output that goes active when a
valid receive carrier is present.
Carrier and PL/DPL Detect – Pin 10
Connect pin 10 to an output in the radio that goes active when a valid receive carrier and PL/DPL is
present. This indicates channel activity when the radio has been placed in monitor mode.
Push-to-Talk (PTT) Sense Input – Pin 13
Connect pin 13 to a point in the radio that goes active (set by SW1-3) when the radio is keyed from a
source other than the ITA2000A. When the ITA2000A senses the radio is keyed, it holds off any remote
or accessory transmit until the PTT sense clears.
N
OTE: If this function is not available, disregard this connection.
Channel Select – Pins 1, 5, 8, 9, and 15
Connect pins 1, 5, 8, 9, and 15 to the points in the radio that will cause it to change channels when the
active logic is present. The active level of these outputs can be set to active low or high as determined by
jumpers JU3 through JU7.
03/13 18
ITA2000A Series Tone Remote Adapter Installation
These pins output the binary equivalent of the decoded function tone from the tone remote or the current
scan selected channel. The chart that follows shows the pin designation and output for the decoded
function tone. These outputs can be used to control other logic-driven functions of radios that support
such features.
Channel Select Pin Designation/Output Chart
Pin 9 Pin 1 Pin 5 Pin 15 Pin 8
F# Frequency MSB Bit 3 Bit 2 Bit 1 LSB
F1 1950 Hz High High High High Low
F2 1850 Hz High High High Low High
F3 1750 Hz High High High Low Low
F4 1650 Hz High High Low High High
F5 1550 Hz High High Low High Low
F6 1450 Hz High High Low Low High
F7 1350 Hz High High Low Low Low
F8 1250 Hz High Low High High High
F9 1150 Hz High Low High High Low
F10 1050 Hz High Low High Low High
F11 950 Hz High Low High Low Low
F12 850 Hz High Low Low High High
F13 750 Hz High Low Low High Low
F14 650 Hz High Low Low Low High
F15 550 Hz High Low Low Low Low
F16* 2050 Hz Low High High High High
*F16 is switch selectable between a monitor and channel steer function (Conventional) or scan on/off
function (Scan).
N
OTE: The logic is inverted if the ITA2000A channel selection outputs are set for active high.
If programmable or N/C pins are not used, clip off or secure in a fashion to prevent leads from
shorting together, thus preventing damage to the adapter or the radio.
19 03/13
Installation ITA2000A Series Tone Remote Adapter
Accessory Connector (J3)
The accessory connector is located on the rear of the ITA2000A Tone Remote Adapter.
Input/Output Accessory Connector Table
Pin Wire Color Description
J3-1 Black/white Channel Steer 3 O
Input/
Output Range
JU11 B position = Lo (0 V dc)*
JU11 A position = Hi (B+)
J3-2 Blue/
white
Carrier Squelch Detect OUT O
JU8 B position = Lo (0 V dc)*
JU8 A position = Hi (B+)
J3-3 Green RX Audio +300 mVRMS O
J3-4 Black AGND
J3-5 White/black Channel Steer 2 O
JU12 B position = Lo (0 V dc)*
JU12 A position = Hi (B+)
J3-6 White PTT I
Lo (0 V dc)
J3-7 Orange RX PL Disable O Closure between pins 7 and 14
J3-8 Red Channel Steer 0 O
JU14 B position = Lo (0 V dc)*
JU14 A position = Hi (B+)
J3-9 Red/white Channel Steer 4 O
JU10 B position = Lo (0 V dc)*
JU10 A position = Hi (B+)
J3-10 Green/white CSQ and CTCSS Detect I
SW1-2 UP = Lo (0 V dc)*
SW1-2 DOWN = Hi (B+)
J3-11 Green/black RX Audio O Connected internally to pin 4 at radio
end of cable.
J3-12 Blue TX Audio 80 mV ac I
J3-13 Blue/black PTT OUT O
JU9 B position = Lo (0 V dc)*
JU9 A position = Hi (B+)
J3-14 Orange/black RX PL Disable I Closure between pins 7 and 14
J3-15 Red/black Channel Steer 1 O JU13 B position = Lo (0 V dc)*
JU13 A position = Hi (B+)
*default from the factory
Accessory Connector Pinout
03/13 20
ITA2000A Series Tone Remote Adapter Installation
ITA2000A to Kenwood TK-790/890 Series Radio Connection Chart
Adapter
Pin
Adapter
Function
Wire Color
Radio
Connector Pin Radio Function
1 Channel steer 3 Blk w/white stripe 5 Auxiliary input 4 (programmable)
2 CSQ Detect IN Blue w/white stripe 8, 20 , 21, 22 Auxiliary output 2
(program to COR)
3 RX audio + Green 17 RX audio signal output
4 AGND Black 7 Earth
5 Channel steer 2 White w/blk stripe 4 Auxiliary input 3 (programmable)
6 PTT White 6 Auxiliary input 5
(program to PTT)
7 Monitor Orange 5 Auxiliary input 4
(program to MON)
8 Channel steer 0 Red 2 Auxiliary input 1 (programmable)
9 Channel steer 4 Red w/white stripe 5 Auxiliary input 4 (programmable)
10 CTCSS IN Grn w/white stripe N/C
11 RX audio – Grn w/black stripe 7 Earth. Connected internally to
15D pin 4 at radio end of cable.
12 TX audio + Blue 13 MIC/Data input signal 1
13
14 Monitor low Orange w/blk stripe 7 Earth. Connected internally to
15D pin 4 at radio end of cable.
15 Channel steer 1 Red w/black stripe 3 Auxiliary input 2 (programmable)
Connector
Housing
Shield
Connected
internally to 15D
pin 4 at radio end
of cable.
NOTES:
The Carrier Detect Signal (COR) must be programmed to an auxiliary output pin. The Radio
Connection Chart shows COR programmed to auxiliary output 2, which is pin 8 of the radio
connector. Carrier Detect is Active High (SW1-2 = DN).
The PTT signal must be programmed to an auxiliary input 5, as per the Radio Connection Chart.
If the monitor function is required, the MON signal must be programmed to auxiliary input 4, as per
the Radio Connection Chart. Programming the MON signal alters the maximum number of channels
that can be scanned. Normally, a maximum of 15 channels can be scanned, however, use of the
MON function limits the maximum to 8 channels. Pin 7 of the adapter must be connected to the RX
CTCSS Disable Input (MON) pin of the radio. Pin 14 of the adapter must be connected to GRND.
21 03/13
Installation ITA2000A Series Tone Remote Adapter
WARNING
If programmable or N/C pins are not used, clip off or secure in a fashion to prevent leads from
shorting together, thus preventing damage to the adapter or the radio.
Adapter Radio Connector
Connector Termination with Internal Jumpers
Connecting Pins 4 - 11- 14.
03/13 22
ITA2000A Series Tone Remote Adapter Installation
ITA2000A to RPG Radio Connection Chart
Adapter
Pin
Adapter
Function
Wire Color
Radio
Connector Pin Radio Function
1 Channel steer 3 Black w/white stripe 6, 8, 9, 12, or 14 Programmable
2 CSQ Detect IN Blue w/white stripe 4, 8, 12, or 14 Programmable
3 RX audio + Green 11 RX audio
4 AGND Black 7 GND
5 Channel steer 2 White w/black stripe 6, 8, 9, 12, or 14 Programmable
6 PTT White 3 Mic PTT
7 Monitor Orange 14, or 6, 8, 9, 12 PL disable (monitor)
8 Channel steer 0 Red 6, 8, 9, 12, or 14 Programmable
9 Channel steer 4 Red w/white stripe 6, 8, 9, 12, or 14 Programmable
10 CTCSS IN Green w/white stripe 4, 8, 12, or 14 Programmable
11 RX audio − Connected internally to
15D pin 4 at radio end of
cable.
12 TX audio + Blue 2 Mic audio
13 PTT Sense IN Blue w/black stripe N/C
14 Monitor low Connected internally to
15D pin 4 at radio end of
cable.
15 Channel steer 1 Red w/black stripe 6, 8, 9, 12, or 14 Programmable
Connector
Housing
Shield Connected internally to
15D pin 4 at radio end of
cable.
OTE: The radio must be programmed to disable emergency functions from pin 9.
N
RPG includes: DESKTRAC, GM300, M1225 (four-channel only).
WARNING
If programmable or N/C pins are not used, clip off or secure in a fashion to prevent leads from
shorting together, thus preventing damage to the adapter or the radio.
Adapter Radio Connector
23 03/13
Radio Connector
Installation ITA2000A Series Tone Remote Adapter
ITA2000A Tone Remote Adapter to MCS2000 Radio Connection Chart (Conventional Mode
Only)
15-Pin
Pin #
Adapter
Function
Wire Color
Radio
Connector Pin # Radio Function
1 Channel Steer 3 Black w/white stripe N/C Programmable
2 CSQ Detect IN Blue w/white stripe 8 Programmable
3 RX audio + Green 11 RX audio
4 AGND Black 10 GND
5 Channel Steer 2 White w/black stripe N/C Programmable
6 PTT White 21 Mic PTT
7 Monitor Orange 7 CTCSS disable
(monitor)
8 Channel Steer 0 Red N/C Programmable
9 Channel Steer 4 Red w/white stripe N/C Programmable
10 CTCSS IN Green w/white stripe 8 Programmable
11 RX audio – Connected internally to 15D
pin 4 at radio end of cable.
12 TX audio + Blue 23 Mic audio
13
14 Monitor low Connected internally to 15D
pin 4 at radio end of cable.
15 Channel Steer 1 Red w/black stripe N/C Programmable
Connector
Housing
Shield Connected internally to 15D
pin 4 at radio end of cable.
WARNING
If programmable or N/C pins are not used, clip off or secure in a fashion to prevent leads from
shorting together, thus preventing damage to the adapter or the radio.
Adapter Radio Connector
03/13 24
HLN6412 Connector Termination with Internal
Jumpers Connecting Pins 1–2 and Pins 4–9.
ITA2000A Series Tone Remote Adapter Installation
Radio Tie Line (Telephone) Connections
If leased lines from your local telephone company are used between the remotes and the ITA2000A Tone
Remote Adapter, the telephone company (local exchange carrier) may request a Facility Interface Code
(FIC). Refer to the Analog Facility Interface Code Table that follows for information about codes that
may be available.
Analog Facility Interface Codes
FIC Description
02NO2 2-wire private line; no signaling conversion by LEC. (IN-Band)
02NO4 4-wire private line; no signaling conversion by LEC. (IN-Band)
Metallic 2- or 4-wire metallic private line. (Hoot and Holler circuits)
Within a manufacturing plant, campus, or large building, customer lines referred to as metallic pairs may
be used. To make appropriate phone line connections, refer to the Telephone Line Connection Table
below.
Telephone Line Connection Table
J1 Connector Pins Description Color and Direction
3 and 4 2-wire TX/RX pair Red/green; bi-directional required.
3 and 4 4-wire TX audio control Red/green; may be uni-directional or bi-directional
5 and 2 4-wire RX audio only Yellow/black; may be uni-directional or bi-directional.
25 03/13
Installation ITA2000A Series Tone Remote Adapter
Jumpers
The default setting of the circuit board jumpers provide normal operation and should be changed only for
special applications. Remove the cover of the ITA2000A to access these jumpers. The “A” and “B”
positions are indicated on the PCBA.
Jumper Table
A = Active High B = Active Low
Jumper
No.
Default
Value
Description
JU2 B Radio PTT
JU3 B Channel Steer Output 4
JU4 B Channel Steer Output 3
JU5 B Channel Steer Output 2
JU6 B Channel Steer Output 1
JU7 B Channel Steer Output 0
JU8 B Accessory CSQ Output
JU9 B Accessory PTT Output
JU10 B Channel Steer Output 4
JU11 B Channel Steer Output 3
JU12 B Channel Steer Output 2
JU13 B Channel Steer Output 1
JU14 B Channel Steer Output 0
−20 dB Out Reduces radio RX by −20 dB
JU20 2W Select 2-wire/4-wire audio
JU21 2W Select 2-wire/4-wire audio
JU22 In Enables audio hybrid for 2-wire configuration
JU24 2W Select 2-wire/4-wire enable
JU30 Out Converts the B+ supply to a 15 V power supply to increase audio
output.
JU31 Pins 1 and 2
Pins 2 and
Selects Channel Steer 4 Output.
Selects J3-9 as alternate dc input.
3*
*If pins 2 and 3 are selected, Channel Steer Bit 4 will be disabled.
03/13 26
ITA2000A Series Tone Remote Adapter Installation
Channel Revert (Conventional Mode Only)
Channel Revert allows the ITA2000A to output a certain value on the four channel selection lines after a
transmit is complete from the remote. The value output on the channel selection lines is determined by
switches SW2-5 through SW2-8.
Channel Revert Settings Table
Switch Determines: Up/Down
SW2-4 Whether channel selections are latched
to last decoded frequency, or revert to
a preprogrammed channel (SW2-5 to
SW2-8) after transmit from land line.
SW2-5
to
SW2-8
The binary representation of the revert
channel.
N
OTE: Revert channel must
correspond to a BCD* code 1 - 15.
Revert to F16 is not
possible.
*Binary coded decimal
Up = Do not revert
Down = Revert based on SW2-5 to SW2-8.
Ch
Home
1
2
3
4
5
6
7
SW2
5 6 7 8
Ch
8
9
10
11
12
13
14
15
SW2
5 6 7 8
27 03/13
Installation ITA2000A Series Tone Remote Adapter
Configuration Switch Settings for Conventional Mode Operation
Two sets of programming switches are included on the front panel of the ITA2000A. They are used to
set up and interface with the radio system. The switch function settings are as follows:
Switch Settings for SW1 (Conventional)
Switch Determines: Up Down
SW1-1* The method of carrier detection from
radio.
Uses radio receive
audio (RX VOX
Uses logic output from
radio.
detect).
SW1-2 is ignored.
SW1-2 The active logic levels for carrier detect if
Active Low Active High
SW1-1 is down.
SW1-3 The active input level of radio PTT sense
Active Low Active High
on radio connector pin 13.
SW1-4 Whether courtesy beep generation is
Disabled Enabled
enabled or disabled.
SW1-5 F16 Enable 2050 Hz is used for
monitor
SW1-6 The polarity of monitor input from desk
Active Low Active High
2050 Hz is used for
F16
mic.
SW1-7 Operate in Conventional or Scan mode Operate in
Operate in Scan mode
Conventional mode
SW1-8** Enter Supervisor Mode upon pressing
Disabled Enabled
desk-mic PTT or Monitor buttons.
*When configured for receive vox detect, the radio receive audio is continuously routed to the phone line
regardless of the vox status using firmware TNA1B and later. The CSQ LED and courtesy tone, if
enabled, are still controlled by the vox status.
**Available in firmware TNA2C and later.
03/13 28
ITA2000A Series Tone Remote Adapter Installation
Switch Settings for SW2 (Conventional)
Switch Determines: Up Down
SW2-1 The receive audio input for radio
connector pin 3.
SW2-2 Whether tone panel will PTT on HLGT
detect and pass the high and low level
function tones to transmit audio.
SW2-3 The timing of monitor output after a valid
monitor command is detected.
SW2-4 Whether channel selections are latched to
last decoded frequency, or revert to a
preprogrammed channel (SW2-5 to
SW2-8) after transmit from wire line.
SW2-5
to
SW2-8
The binary representation of revert
channel. SW2-5 is MSB and SW2-8 is
LSB.
Example: To revert to channel 3 after
transmit, set the switch as follows:
Speaker level audio
(unsquelched
de-emphasized audio)
PTT after valid
function tone detect
and filter tones to
Detector audio
(squelched, requires
de-emphasis)
PTT on HLGT detect,
pass tones to transmit
audio.
transmit audio.
Monitor output
latched until a valid
transmit command is
detected from the
Monitor output is active
4 seconds after a valid
monitor command is
detected.
wire line.
Stay on last decoded
frequency from wire
line.
Revert to the channel
determined by SW2-5 to
SW2-8.
High Low
SW2-5 = Up, SW2-6 = Up,
SW2-7 = Down, SW2-8 = Down.
See Channel Revert Chart on page 27
OTE: Revert to F16 is not possible.
N
29 03/13
Installation ITA2000A Series Tone Remote Adapter
Configuration Switch Settings for Scan Mode Operation
Two sets of configuration switches are included on the front panel of the ITA2000A. The switch
function settings are as follows:
Switch Settings for SW1 (Scan)
Switch Determines: Up Down
SW1-1 The receive audio input for radio
connector pin 3.
Speaker level audio
(unsquelched
de-emphasized audio)
Detector audio
(squelched, requires
de-emphasis)
SW1-2 The active input level for carrier detect. Active Low Active High
SW1-3 The active input level of radio PTT sense
Active Low Active High
on radio connector pin 13.
SW1-4 Whether courtesy beep generation is
Disabled Enabled
enabled or disabled.
SW1-5 How scan resumes after a desk set PTT. The unit will cease
scan and not resume
after a desk set PTT
The unit will resume
scan after the scan-stop
time upon release of
the desk set PTT
SW1-6 The polarity of monitor input from desk
mic.
SW1-7 Operate in Conventional or Scan mode Operates in
Active Low/ Normally
Open
Active High/ Normally
Closed
Operates in Scan mode
Conventional mode
SW1-8 How scanning resumes after loss of
carrier detect
The unit will cease
scan and not resume
after a loss of carrier
detect
The unit will resume
scan after the scan-stop
time upon loss of
carrier detect
03/13 30
ITA2000A Series Tone Remote Adapter Installation
Switch Settings for SW2 (Scan)
Switch Determines: Up/Down Settings
SW2-1
to
SW2-4
SW2-5
to
SW2-7
Scan Limit: Maximum number of channels
to be scanned.
Sequence of scanning starts at channel 1
and counts upward to the maximum
number of channels to be scanned. Once
the maximum channel has been reached
the scanning sequence repeats beginning
with channel 1.
N
OTE: The wrap-around time for
scanning the same channel is a function of
the scan limit and the scan rate. For
example, if the scan limit is 10 and the
scan rate is 100 ms, the minimum wraparound time for any one channel is 10
100 ms, or 1 second.
Scan Rate (ms): Time allotted for carrier
detect per channel frequency.
Depending upon the radio and the
programming of the radio used, the time
required for detection of valid carrier can
vary. Factors such as the design of the
radio, use of PL/DPL and quieting can
affect carrier detection time. Consult your
radio manual and manufacturer for specific
carrier-detect times.
N
OTE: The scan rate should be set for the
maximum time any one channel requires
for reliable carrier detection.
Scan
Home
1
2
3
4
5
6
7
Rate
(ms)
100
120
160
200
SW2
1 2 3 4
SW2
5 6 7
Scan
8
9
10
11
12
13
14
15
Rate
(ms)
400
420
460
500
SW2
1 2 3 4
SW2
5 6 7
SW2-8 Scan Stop Time: Time scan halts after a
desk set PTT (SW1-5) or carrier is no
longer detected (SW1-8).
NOTE: Scan Rate Setting - Due to the differences in radios, the scan rate should be selected from the
slowest level (500 ms) first. The scan rate can be affected by the PL/DPL decode time within certain
radio transceivers.
31 03/13
UP = 4 seconds
DN = 2 seconds
Installation ITA2000A Series Tone Remote Adapter
Level Settings and Adjustments
Receive Audio Level
The ITA2000A is shipped from the factory set to accept a 300 mV receive audio input level from the
station’s receiver. To accommodate receivers with different audio levels, perform the following steps:
1. After verifying the connections are properly made to the station in accordance with the installation
instructions, apply power to the station and the ITA2000A.
2. Inject a fully quieted (approximately 1000 microvolt) RF signal set to the station receiver’s antenna
connector. Modulate the RF generator with a 1000 Hz tone at rated system deviation.
3. If applicable, enable the proper PL or DPL code on the RF generator at 15% system deviation
(approximately 750 Hz of deviation).
4. Adjust the
RX level pot for −6 dBm (388 mV) at U18 pin 7, or mic jack J4 pin 8.
5. Remove the 1000 Hz tone or use diagnostic Test 1.
Line Output Level
The phone line level has been factory-set to 0 dBm at reference input level. This setting should be
adequate for most installations. Use the following procedure if readjustment is ever required:
N
OTE: For this adjustment, it is necessary to open the housing to gain access to the line out
potentiometer located on the PCBA. It is important that the receive audio level (RX) is set properly prior
to setting the line output level.
1. Perform steps 1 through 3 in the Receive Audio Level section above.
2. While monitoring the line level with an ac voltmeter (with phone line connected), adjust the line out
potentiometer, pot 3, for the required level.
N
OTE: It is important not to exceed the level recommended by the line provider.
03/13 32
ITA2000A Series Tone Remote Adapter Installation
Transmit Audio Level
Begin by causing the station to transmit by sending a 1000 Hz tone at reference level from a remote
dispatch console or desk set.
A communications service analyzer with a built-in tone remote testing function, such as the Motorola
R2600, may be used to emulate the remote at the adapter site. Refer to the analyzer’s instruction manual
for specifics of this method. This method uses the RTL-1003A Transformer.
Alternately, have a person located at the remote dispatch point perform a test transmission by speaking at
a normal voice level into the microphone of a desk set while the remote is in the transmit mode.
When working alone, another option is to carry a spare tone remote desk set to the base site. Connect it
to the adapter’s phone line connector, and use it to perform this test. The remote’s transmit level must be
within the automatic gain control range of the adapter, which is −24 dBm to 0 dBm.
Monitor the station with the modulation monitor set to the station’s operating frequency. Adjust the TX
potentiometer on the rear of the ITA2000A to just produce rated system deviation. Excessive input
levels will cause distortion and increased background noise. A setting that is too low will result in low
volume levels at the mobile receivers.
A final operational check using live speech from a remote dispatch location should be made to confirm
any of the previously described methods used to set the transmit audio level.
33 03/13
Installation ITA2000A Series Tone Remote Adapter
Test Diagnostics
Enter this mode by pressing the SUPERVISOR button for more than 4 seconds. All LEDs illuminate for
2 seconds, indicating the ITA2000A is in the test mode. Pressing the
(less than 4 seconds) causes the ITA2000A to step up to the next test.
SUPERVISOR button momentarily
WARNING
Tests 2, 3, and 4 are for factory testing only. Disconnect the ITA2000A from the radio and
disconnect all accessories from the ITA2000A when performing Diagnostic Tests 2, 3, and 4. These
diagnostics are intended for factory testing only and perform input/output configuration tests that
may damage the interface to the radio and/or any accessories connected to the ITA2000A.
Test 1: Test 1 can be used to set up system audio levels. It routes a 1000 Hz reference tone to the
telephone line and the transmit audio of the radio connector.
1. Adjust the transmit audio pot to the desired level of system deviation.
2. To set the ITA2000A receive audio sensitivity level from the radio, inject a 1000 Hz tone into the
receive audio input of the radio connector at the level representing the radio receive audio level.
OTE: If a radio is connected to the radio connector, an RF service monitor can be set up to send a
N
1000 Hz tone to the radio at 2/3 system deviation.
3. With the tone present, the receive input level pot can be adjusted until the
ACC PTT lights indicate
that the proper receive audio level threshold has been achieved.
03/13 34
Theory of Operation
Technical Overview
U1 performs various tasks requested by the firmware which reconditions the signal, such as 2175 Hz
guard tone filtering, line auto-leveling, tone generation, tone filtering, tone decoding, and 2-wire audio
hybrid control. Radio RX audio and TX audio from the remote line is digitized in codec U20 and U21 to
allow U1 to perform digital signal processing. After U1 reconditions the digital signal, the signal is
passed to the codec, where it is converted back to analog at the internal reference level of –6 dBm.
Hardware gain circuitry is used to adjust the signal for the desired audio output level external to the unit.
The ITA2000A has seven configurable logic inputs; U8 provides the status of these inputs to U1, where
U1 processes the data and the end result is output by U11. An internal hardware jumper (JU2-JU14) can
configure each output, DL0-DL7, for a logic high or logic low. U11 drives DL0-DL7 low; when the
jumper is in the B position this provides an active low output, when the jumper is in the A position the
signal drives a transistor applying B+ to the output providing an active Hi output.
The ITA2000A takes the external audio input signals it receives and uses gain stages to produce an
internal reference level of −6 dBm. This internal reference level is then used as nominal input/output
level for codecs U20 and U21.
Transmit Audio
Audio from the phone line enters the unit at J1-3 and J1-4 and passes through transformer T2 and then
buffered by amplifier U24c. The output of U24c is fed into digital pot U22; the DSP U1 adjusts U22 for
an output (internal reference) level of –6 dB. The reference level is input at pin 14 of codec U21. The
digital output of U21 is fed to U1 DSP. The digital signal is then converted back to analog and output at
pin 3 of codec U20 at the internal reference level of –6 dB.
For radio mic TX, the reference level is adjusted with pot 1 and amplifier U16 to accommodate an output
range of 32 to 800 mV ac into a 560-ohm load. For TX audio to the accessory, the reference level is
adjusted with amplifier U17 for an output of 300 mV ac into a 560-ohm load.
Radio Audio
Radio RX audio enters the unit at J2-3 and J2-11 and is converted to a single-ended signal by op-amp
U18. Pot 2 (RX audio sensitivity) is used to adjust the output of U18a for the internal reference level of
–6 dBm. This reference level is output to the desk mic connector. For accessory RX audio, the reference
level is adjusted with amplifier U17 for an output of 300 mV ac into a 560-ohm load.
For telephone line output, the reference level is passed to U20 where it is converted from analog to
digital, the signal is then reconditioned by U1 DSP and converted back to analog by U21and output at
U21-3 at the reference level of –6 dBm. The output of U21-3 is passed to amplifier U23 where pot 3
(line out) adjusts the output to accommodate for a range of −15 dBm to +10 dBm into a 600-ohm load at
the telephone line output J1-3 and J1-4.
35 03/13
Theory of Operation ITA2000A Series Tone Remote Adapter
Accessory Transmit
Accessory TX audio input J3-12 expects a nominal input level of 80 mV ac. U18 buffers the signal and
U19 routes the signal to the radio TX and the telephone line output based on the state of the accessory
PTT J3-6. For radio TX, the audio is routed to amplifier U16, then output to the radio TX. For
telephone line output, the audio is routed to amplifier U23, then output to the telephone line connection.
Desk Mic Transmit
Input at J4-5, TX audio from the desk mic jack is controlled with U19 based on the state of J4-6 (desk
mic PTT input) and routed to radio TX output, telephone line output, and the accessory RX output.
For radio TX, the audio is routed to amplifier U16, then output to the radio TX. For telephone line
output, the audio is routed to amplifier U23, then output to the telephone line connection. For accessory
RX output, the audio is routed to amplifier U27, then output to the accessory RX output.
Reset Circuit
An internal watchdog circuit consisting of U3, Q1, C5, and associated components provides reset to the
DSP. In normal operation U1 generates an IRQ signal on pin 30 that drives Q1 keeping C5 discharged.
If the IRQ signal is not present, C5 will charge and force U3 pin 6 low. U29, low voltage monitor IC
resets U1 whenever the 5 V dc supply is out of tolerance and provides approximately 200 ms of reset
upon power up.
03/13 36
T roubleshooting
Troubleshooting the ITA2000A Tone Remote Adapter
The following is a list of potential problems you may encounter and possible solutions.
Problem Possible Solution
The ITA2000A will not key
the radio.
Ensure that one of the ITA2000A PTT outputs is connected to the radio.
Check the telephone line continuity from the ITA2000A to the remote.
Check that the telephone line is balanced by making sure neither side of the
Radio is keyed constantly
while the ITA2000A is
connected.
RX audio is low or
distorted.
Ensure that the telephone line is balanced by making sure neither side of
Ensure that there is no more than 20 dB of loss in the telephone line.
There is squelch noise in
RX audio, or no RX audio.
Ensure that the tone remotes are generating a function tone that the
ITA2000A uses for keying the radio.
(Pin 6 for ground keying or active high.) Refer to the Jumper Table on
page 26 of this manual.
telephone line is grounded.
Ensure that the JU2 jumper is set for the proper active state:
JU2 A position = B+ keying
JU2 B position = Ground keying
Ensure that the ITA2000A receive sensitivity is set properly. See the Level
Settings and Adjustments information starting on page 32 in the
“Installation” section of this manual.
the telephone line is grounded.
Ensure that the telephone line is balanced by making sure neither side of
the telephone line is grounded.
Ensure that there is no more than 20 dB of loss in the telephone line.
Ensure that the ITA2000A audio input (pins 3 and 11) is connected to a
Check that the volume pot has not been turned down if the ITA2000A RX
Ensure that the proper input polarity of the CSQ detect has been set with
Ensure that the scan rate is properly set using SW2-5 through SW2-7.
TX audio is distorted. Verify that the tone adapter transmit audio output level is not set too high
37 03/13
point in the radio that has receive audio present when a valid carrier and
PL/DPL (if needed) is detected.
audio is connected to the volume pot of the radio's speaker. Connect to the
high side of the volume pot.
SW1-2.
for the radio’s expected input level. Adjust the TX output level pot for
proper setting.
Troubleshooting ITA2000A Series Tone Remote Adapter
Problem Possible Solution
There is no TX audio. Verify that the radio is being keyed when transmitting to the ITA2000A
from a tone remote. If the radio is not being keyed, refer to the section
above describing the radio not being keyed.
Ensure that the ITA2000A audio output (J2-12) is connected to a point in
the radio that causes the audio to be transmitted when the radio is keyed.
Verify that the ITA2000A TX output level is properly set and there is no
more than 20 dB of loss in the telephone line. If appropriate, adjust the
transmit audio output or desk set microphone sensitivity.
ITA2000A does not scan. Ensure that the proper input polarity of the CSQ detect has been set with
SW1-2.
Ensure that SW2-1 through SW2-4 are set according to the maximum
number of channels to be scanned.
If SW1-8 is configured for resume scan after PTT, ensure that PTT is
generated by the remote.
Ensure that there is no off-hook mic or shorting plug connected to the mic
port of the ITA2000A, and that the monitor pin of the accessory connector
is not asserted.
ITA2000A does not
transmit or receive.
Ensure that there is a telephone line audio path from the ITA2000A to the
tone remote desk set.
Check that neither fuse is open on the telephone line.
Ensure that the ITA2000A is connected to a dc or ac (with a dc power
supply option) power source.
A tone is being output on
the phone line during and
accessory/desk-mic PTT or
Monitor assertion.
In Scan mode, this feature allows for the clearing of status and lock-out of
any connected tone remotes.
In Conventional mode, this feature allows the lock-out of any connected
tone remote. It can be disabled by placing SW1-8 in the down position.
Fuse Replacement
CAUTION
For continued safe operation, replace fuses with the same type.
Fuse F1 (power supply) is 1 amp, 250 V, 5 mm 20 mm.
Line fuses (F1 and F2) are Bussmann C515S 1.25A 2AG SB.
03/13 38
Main Circuit Board
39 03/13
Main Circuit Board ITA2000A Series Tone Remote Adapter
40
Schematics
41 03/13
Schematics ITA2000A Series Tone Remote Adapter
42
Digital Section - Schematic Diagram Sheet 1 of 6
ITA2000A Series Tone Remote Adapter Schematics
43
Serial Logic - Schematic Diagram Sheet 2 of 6
Schematics ITA2000A Series Tone Remote Adapter
44
Power Supply Section - Schematic Diagram Sheet 3 of 6
ITA2000A Series Tone Remote Adapter Schematics
45
Line Interface - Schematic Diagram Sheet 4 of 6
Schematics ITA2000A Series Tone Remote Adapter
46
Radio, Phone, and Mic - Schematic Diagram Sheet 5 of 6
ITA2000A Series Tone Remote Adapter Schematics
47
Output Port - Schematic Diagram Sheet 6 of 6
Schematics ITA2000A Series Tone Remote Adapter
48
Notes:
Term Definition
Definitions and Acronyms
Channel
CSQ
FT
HLGT
Home
Mode
LLGT
Monitor
Mode
DPL
PL
PTT
A single path, separated by frequency or time divisions, for transmitting electrical signals.
A receive (one-way) or receive and transmit (two-way) frequency path.
Carrier squelch
Function tone
High level guard tone
All channel steers not asserted and scan stopped.
Low level guard tone
PL/DPL disable
A system analogous to PL but using low speed digital signaling instead of subaudible
tones.
A means of grouping users of a common radio channel. Subaudible tones are transmitted
with audio; a particular radio's speaker (or the speakers of a group of radios) will unmute
to broadcast a transmission only if the associated subaudible tone identifies it as
belonging to the radio’s user group.
Push-to-talk
49 03/13
Notes: ITA2000A Series Tone Remote Adapter
50
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