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MDLC over IP - Standard Modem, MDLC over Null Modem, Advanced Features Manual.

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Communications MDLC over IP - Standard Modem To avoid system setup for each modem/radio which supports packet data, a general concept has been introduced for, whereby IP can connect to any modem or radio supporting packet data. A standard modem supporting packet data is a modem which requires an AT command set to configure and PPP to initiate. It can connect to a PC using Microsoft Standard Modem and RAS setup. A modem configuration file can be downloaded into the RTU specifying the exact command set needed by the modem/radio. A default AT command set is used in case this file is not downloaded. The same concept is used for circuit data modem over dial port. For information of downloading modem configuration files, refer to ACE3600 STS Advanced Features Manual. Connection to Standard modem is made using RS232 PPP over the operator infrastructure. Since the operator infrastructure connects to LAN as well, a LANconnected RTU can communicate directly with these RTUs over that infrastructure, if enabled by the operator. Some modems have an internal fixed IP address for PPP connection. If so, only one modem of the same vendor can be connected to RTU, since they all have the same IP address. Other modems such as Motorola g18 do not have an internal IP address; in this case several MDLC over IP ports can be configured to connect with them. To verify if more than one modem can be used, try to connect two modems and see if you get an error message: "IP Address in use by other ports". MDLC over Null Modem The RTU can connect to any device using PPP. This connection is made using PPP and is basically the same as MDLC over Standard modem. When the RTU is powered up, it sends a client string and expects a client-server response. Only when it gets that response will it initiate PPP and poll for CD signal (carrier detect). CD is constantly being polled, and if it drops, PPP is disconnected. The user can opt to ignore CD using Advanced Link Layer parameters in the site configuration. In this case, PPP is initiated upon power up. When connected, CD is polled in order to stay connected. If it drops, then PPP is reconnected. By default, the RTU acts as a Windows Null modem connection. It sends a client string and expects a client-server response before initiating PPP. The user can override this behavior by downloading a modem configuration file. 113

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

Match case Limit results 1 per page

Communications

MDLC over IP

- Standard Modem

To avoid system setup for each modem/radio which supports packet data, a general

concept has been introduced for, whereby IP can connect to any modem or radio

supporting packet data.

A standard modem supporting packet data is a modem which requires an AT command

set to configure and PPP to initiate. It can connect to a PC using Microsoft Standard

Modem and RAS setup. A modem configuration file can be downloaded into the RTU

specifying the exact command set needed by the modem/radio. A default AT command

set is used in case this file is not downloaded. The same concept is used for circuit data

modem over dial port.

For information of downloading modem configuration files, refer to ACE3600 STS

Advanced Features Manual.

Connection to Standard modem is made using RS232 PPP over the operator

infrastructure. Since the operator infrastructure connects to LAN as well, a LAN-

connected RTU can communicate directly with these RTUs over that infrastructure, if

enabled by the operator.

Some modems have an internal fixed IP address for PPP connection. If so, only one

modem of the same vendor can be connected to RTU, since they all have the same IP

address. Other modems such as Motorola g18 do not have an internal IP address; in this

case several MDLC over IP ports can be configured to connect with them.

To verify if more than one modem can be used, try to connect two modems and see if you

get an error message: “IP Address in use by other ports”.

MDLC over Null Modem

The RTU can connect to any device using PPP.

This connection is made using PPP and is basically the same as MDLC over Standard

modem. When the RTU is powered up, it sends a client string and expects a client-server

response. Only when it gets that response will it initiate PPP and poll for CD signal

(carrier detect). CD is constantly being polled, and if it drops, PPP is disconnected. The

user can opt to ignore CD using Advanced Link Layer parameters in the site

configuration. In this case, PPP is initiated upon power up. When connected, CD is polled

in order to stay connected. If it drops, then PPP is reconnected. By default, the RTU acts

as a Windows Null modem connection. It sends a client string and expects a client-server

response before initiating PPP. The user can override this behavior by downloading a

modem configuration file.

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