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Analog Trunked Radio Systems, audio will be used; a quality analysis will occur at regular intervals

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Communications Analog Trunked Radio Systems In an analog trunked radio system, any unit that needs to send a message, requests, and is assigned to, a channel by the trunking system controller. The ACE3600 RTUs are typically clustered into a single trunked data group and are managed by the trunking system controller as a single entity. Therefore, any RTU that requests a channel causes all RTUs to switch to the assigned channel so that all units hear, decode, and may appropriately respond to the data transmitted. Two way data transfer among many RTUs may occur following a single channel request/assignment. Also, trunked systems provide an infrastructure that is inherently redundant-if one base station should fail, the trunked system automatically assigns communications to a remaining station. SCADA system data and trunked radio systems are very compatible! Most analog trunked radio systems are set up to optimize the performance of the many mobile and portable voice radios in the system. This setup may not be optimal for data users. ACE3600 operates best in the Message Trunking mode whereas many systems are setup to use the PTT-ID Trunking mode. ACE3600 may be made compatible by lengthening the delay-before-transmit time to allow the PTT-ID activity to be completed before the ACE3600 data is transmitted. Many trunked radio systems are designed with multiple transmit and receive sites. This is advantageous for the mobile and portable users that roam over a large territory but detrimental to ACE3600 data use. Receiver voting is present so the best quality received audio will be used; a quality analysis will occur at regular intervals, typically 350 msec, and a switch to the better quality signal may occur. That switch (revote) may introduce a small hole and/or a signal phase change into the audio message. Voice users are minimally affected by the hole/phase-change, but those artifacts may compromise the data message so that no throughput occurs (complete destruction). When ACE3600 is used in a multi-site system, the antenna choice and placement must be carefully selected so that only one site will receive a strong signal - this will prevent the site switch associated with a revote. System engineers are encouraged to contact the ACE3600 Product Support Group during the design phase of any trunked radio system so that these and other issues may be discussed. 125

Section	Page
Table of Contents	3
ACE3600 System Overview	5
ACE3600 RTU Construction	7
Power Supply Modules	10
12V Backup Battery	11
CPU Modules	12
I/O Modules	14
Digital Input Modules	17
Digital Output Relay Modules	26
Analog Input Modules	35
Analog Output Modules	43
Digital Output and Digital Input FET Modules	49
Mixed I/O Modules	56
Mixed Analog Modules	58
I/O Expansion	60
Expansion Power Supply Module	64
Expansion Module	65
Module Firmware and Operation Modes	66
Expansion Module Power-up and Restart	68
Expansion Module during Run-Time	68
Expansion LAN Switch	69
RTU I/O Expansion - Power Considerations	71
Ordering Information	74
ACE3600 RTU Ordering Flow:	74
List of ACE3600 Models	84
List of ACE3600 Options	86
Mixed Input/Output Modules	87
Mixed Analog Modules	87
I/O Module Cables	88
General Ordering Requirements	89
ACE3600 Installation Guidelines	90
Dimensions	90
Frame Dimensions:	90
Metal Chassis Dimensions:	90
Housing Dimensions:	90
GENERAL SAFETY INFORMATION:	91
Mounting the ACE3600 Frame on a Wall	92
Wall Mount Installation	92
Installing the ACE3600 in a 19\	94
Housing Installation	95
Communications	97
MDLC Protocol	98
MDLC Data Transfer Methods	101
Communication Links	102
RS232 Ports	102
RS485 Ports	103
IP Ports (MDLC over IP)	105
Broadcast and Setcalls	106
New Features for MDLC over IP in ACE3600	106
Multiple IP Ports	106
IP Conversion Table Enhancements	107
Using Host Names	107
Configuring NTP Servers	108
User Protocol over IP	108
Dynamic IP Address	108
MDLC over IP Port Routing	108
MDLC over IP PPP Connections	109
MDLC over IP/LAN Connections	109
MDLC over IP Site Paging	110
MDLC over LAN/Ethernet	111
MDLC over ASTRO IV&D	112
MDLC over iDEN	114
MDLC over Tetra	115
MDLC over IP - Standard Modem	117
MDLC over Null Modem	117
MDLC over GPRS Network	118
IP Conversion Tables	120
Firewall	122
Radio Communications	124
Radio FCC information	125
Conventional and Analog Trunked Radio Modulation Types	126
PL & DPL	126
FCC Reframing (USA only)	127
VHF Splinter Channels (USA only)	127
Analog Trunked Radio Systems	129
Digital Trunked Radio Systems	130
Conventional Radio Interoperability	130
Introduction	130
Channel Monitor Resolution Parameter (MDLC Slot Time)	130
First Warm-up Delay Parameter	130
F1-F2 Repeater Considerations	131
Parameter Setting for Motorola Conventional Radios in MOSCAD / ACE3600 Systems	131
Setting the Parameters in the MOSCAD/MOSCAD-L ToolBox	132
Setting the Parameters in the ACE3600 STS	132
Communication Network	133
Communication Types	134
Network Configurations	135
Simple System	135
Two-Link and Multiple Link Systems	135
Two-Zone System	136
Multiple Zone System	137
MDLC Encryption	139
Overview	139
Encryption Keys	141
Encryption in the STS/ToolBox MDLC Driver	142
Security Administration Tool	143
MDLC Encryption Implementation Considerations	143
Clock Functions and Synchronization	144
RTU Clock	144
Time Adjustment and Synchronization	144
User Time Control Actions	145
System Time Control Actions	146
NTP Clock Synchronization	146
NTP Architecture	147
Global Positioning System (GPS)	148
SCADA System Components	149
Control Center – SCADA Manager	149
FEP	149
M-OPC	149
IP Gateway	151
Legacy ModBus FEP	151
Appendix A - ACE3600 Specifications	153
Power Supply Module Specifications	156
CPU 3610/CPU 3640 Module Specifications	159
DI Module Specifications	160
DO/DI FET Module Specifications	163
DO Relay Module Specifications	165
AI Module Specifications	167
AO Module Specifications	168
Mixed I/O Module Specifications	169
Mixed Analog Module Specifications	171
Expansion Power Supply Module Specifications	173
Expansion Module Specifications	174
Expansion LAN Switch Specifications	175
Appendix B - FCC InformationSpectrum and Regulatory Update	176
FCC Rules Update	176
Refarming and Narrow Banding	176
UHF Offset Channels	176
VHF Splinter Channels	177
Emission Designators	177
Data Efficiency Standards	177
Narrowbanding Update	178
Licensing of Fixed Data Systems	179
Spectrum Available for Fixed Data Systems	179
UHF Low Power Pool	179
Low Power Pool Group Specifications	180
Other Part 90 Frequency Options	181

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Communications

Analog Trunked Radio Systems

In an analog trunked radio system, any unit that needs to send a message, requests, and is

assigned to, a channel by the trunking system controller. The ACE3600 RTUs are

typically clustered into a single trunked data group and are managed by the trunking

system controller as a single entity. Therefore, any RTU that requests a channel causes all

RTUs to switch to the assigned channel so that all units hear, decode, and may

appropriately respond to the data transmitted. Two way data transfer among many RTUs

may occur following a single channel request/assignment. Also, trunked systems provide

an infrastructure that is inherently redundant—if one base station should fail, the trunked

system automatically assigns communications to a remaining station. SCADA system

data and trunked radio systems are very compatible!

Most analog trunked radio systems are set up to optimize the performance of the many

mobile and portable voice radios in the system. This setup may not be optimal for data

users. ACE3600 operates best in the Message Trunking mode whereas many systems are

setup to use the PTT-ID Trunking mode. ACE3600 may be made compatible by

lengthening the delay-before-transmit time to allow the PTT-ID activity to be completed

before the ACE3600 data is transmitted.

Many trunked radio systems are designed with multiple transmit and receive sites. This is

advantageous for the mobile and portable users that roam over a large territory but

detrimental to ACE3600 data use. Receiver voting is present so the best quality received

audio will be used; a quality analysis will occur at regular intervals, typically 350 msec,

and a switch to the better quality signal may occur. That switch (revote) may introduce a

small hole and/or a signal phase change into the audio message. Voice users are

minimally affected by the hole/phase-change, but those artifacts may compromise the

data message so that no throughput occurs (complete destruction). When ACE3600 is

used in a multi-site system, the antenna choice and placement must be carefully selected

so that only one site will receive a strong signal — this will prevent the site switch

associated with a revote.

System engineers are encouraged to contact the ACE3600 Product Support Group during

the design phase of any trunked radio system so that these and other issues may be

discussed.

125