SBX Control Unit

SBX Basic KSU R3

Main Control Unit provides expansion to 3 lines in X 8 phones

The MBU controls the communication between the peripheral interfaces, supervises all resources in the system, controls the gain adjustment of the PCM signal, generates the system tones, and manages system call processing.

This MBU performs all the same functions as the MBU shown above. This unit was modified to accommodate expanded capabilities such as the T1/PRI board and the 3x8 Expansion board.

The MBU is installed in the KSU, and it provides various types of connectors and RJ11 modular jacks for the connection of peripheral boards and miscellaneous functions.