Motorola V186 - Cell Phone - GSM System Planner Manual page 111

MDLC over LAN/Ethernet
The ACE3600 RTU can communicate over Ethernet media, via the onboard Ethernet port
or 10/100BT plug-in ports.
The figure below illustrates an example of a SCADA system with IP Gateway and
ACE3600 RTUs connected to Ethernet LAN:
SCADA
Central
LINE 1
RS-232
STS
10BaseT
RS-232
STS
With SCADA systems the ACE3600 RTU can be connected to Ethernet/LAN as an FEP
(FIU) for a SCADA, and an RTU. It communicates with MDLC over IP between FEP/IP
Gateway and RTU. The IP Gateway unique functionality provides an API over TCP/IP
API, for the SCADA PC. It provides the SCADA with the current values of the RTU
tables and with the events (Bursts) that are associated with each entity. The ACE3600
does not have that functionality built-in and requires an IP Gateway.
Unlike IP Gateway, ACE3600 can be connected to several Ethernet connections. They
can reside on the same or on different network subnet masks, and are distinguished from
one another by a link name.
IP
Gateway
Network
Ethernet 2
10BaseT
RTU-IP1
STS
IP
RTU-IP2 RTU-IP3
on Ethernet on Ethernet
on-board Port Plug-in Port
107
Communications
Ethernet 1
Ethernet 3
10BaseT