Motorola 68P02958C00-B - Manual (Page 26)

System Overview
2-6
SCADA Central
IP Gateway
ToolBox
(over IP)
Ethernet
IP Gateway
LINE 1
RS232
ASTRO Spectra Radio
MOSCAD
RTU
MOSCAD
Programming
ToolBox
(over IP)
RS232
MOSCAD-L
RTU
IP Cloud
ASTRO Spectra Radio
LINE 1
SLIP
Connection LINE 1
SLIP
Connection
ASTRO RF
System
RNC
IP Network
Figure 2-4: Typical Configuration, MDLC via Astro IP
MDLC Over Private DataTac
MOSCAD RTUs can communicate over Private DataTac systems (RDLAP) with SCADA
centrals and with other RTUs. All MDLC features are preserved except for clock
synchronization.
RTUs are connected to RDLAP (DataTac) radios (e.g. VRM 500, 600, 650, 660, and TRM
660) via RS232. An RTU sends a message (MDLC), through the radio to the Radio Network
Controller (RNC). The RNC encapsulates the MDLC message and send it over IP to the IP
Gateway. The IP Gateway then extracts the MDLC message from the IP envelope and
transmits it to the appropriate destination. If the destination is another RTU over Private
DataTac, the IP Gateway must support the reflector feature, which enables it to “reflect” the
message back over RDLAP (DataTac).