Communications Interface

Each MOSCAD RTU is identified by the communication device it contains, normally the type and power
level of the internal two-way radio device. The CPU module in the RTU contains the communication interface
board most commonly used with the included radio although
other types of interface boards may generally be
substituted.
Wireline communications may replace radio communications.
Two separate pieces of hardware are added
to the RTU: a line interface plug-in board (internal modem)
in the CPU module that replaces the radio interface
board and a line interface box that replaces the radio. It is
mechanically impossible for simultaneous radio and wireline
communications to exist in one CPU module (except
for the special case when an external modem is connected
to Port 2 and some radio interface exists on Port 3).