Motorola V186 - Cell Phone - GSM System Planner Manual page 115

RS-232
STS
STS
MDLC over Tetra
ACE3600 RTUs can be connected to a Tetra radio. Tetra infrastructure and radio should
support packet data.
The connection to Tetra can be made via LAN or via radio. An IP Gateway or an RTU
with and Ethernet plug-in or on-board port can be connected to a LAN. In Tetra terms, an
RTU that is connected through LAN is called a LAN RTU. An RTU that is connected to
a radio is called a PEI (Peripheral Interface) RTU. A PEI RTU is connected to a radio
through RS232 using standard PPP (Point to Point Protocol).
In the figure below, the SCADA central and IP Gateway are connected via LAN to Tetra
infrastructure. Each RTU has an MTM700 or MTM800 radio connected to its MDLC
over IP Port using PPP. A unique IP address is assigned to each RTU according to its
radio's identifier (SSI). All communication between RTUs and the IP Gateway involve
sending datagrams in packets over the Internet (IP). A PC running ACE3600 STS can be
connected directly to an RTU or operate remotely over IP.
SCADA
Central
Ethernet
LINE 1
IP
Gateway
iDEN
infrastructure
Base
Station
LINE 1
iDEN iM1000
Packet Data
modem
RTU-A
RS-232
111
IP
Routing
Net
Home
Agent
Interface
Router
Mobile
Data
Gateway
iDEN iM1000
Packet Data
modem
RTU-B
Communications