ARIA SOHO IP Hardware Description and Installation Manual
Issue 1
BOARD INSTALLATION
December, 2008
30
4.2 Main Board Unit (MBU)
The Main Board Unit (MBU) controls 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.
FIGURE 4.2 MBU
The following are included on the MBU:
DKT and SLT interface circuits
Ring Generation circuit
External Relay contact for LBC or General purpose
Alarm Detection circuit
External Page port
Internal
MOH
circuit
External MOH port
Peripheral Device Decoding circuit
Master Clock Generation circuit
PFT circuit [CO1
Ù
the last SLT port(STA8)]
RS-232C Interface circuit
LAN
Interface circuit
PCM Voice Processing circuit (ACT2 - ASIC, voice switching, including DSP)
- PCM Tone Generation
- PCM Gain Control
- Tone (DTMF / CPT / FAX) Detection
- CID Signal (FSK/DTMF/RUS CID) Detection
NOTE—When AC Power was failed, the last SLT port on MBU will be connected to CO1 automatically.