SBX Expansion KSU

SBX Expansion KSU R3

This unit was modified to include expanded system capabilities such as the DTIB16 card which supports 16 digital stations.

The Expansion Main Board Unit provides the following features:
• DKT and SLT Interface circuits
• Ring Generation circuit
• External Relay contacts for LBC or general purpose
• Peripheral Device Decoding circuit
• Master Clock Generation circuit
• PFT circuit [CO1 ⇔ the last SLT port (STA8)]
• PCM Voice Processing circuit with ACT2 (ASIC, voice switching including DSP) device for PCM tone generation and PCM gain control.