The Base bus is
the management and control bus of the OSTA 2.0 subrack. It provides a channel for software loading, alarm reporting, and
maintenance message delivery.

The SWU is the
switching core of the Base plane. It implements information exchange on the
system control plane and provides external interfaces of the Base plane. All boards are connected to the SWU through
the Base plane. The SWU exchanges maintenance messages among all the boards.

The clock control module consists of the OMU
and Base bus.
The clock control module allows you to perform operations such as data
configuration, maintenance, and status query on the clock system.

The
OMU is connected to the LAN Switch through the Base
bus.

The SMM can process the information collected by
the power monitoring board, and then report the information to the OMU through
the Base bus