Main Processor Board (Mpb) Installation - Vodavi Starplus Triad 1/2/3 Installation Manual

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Main Processor Board (MPB) Installation

The MPB is installed in the right most PCB card slot (slot MPB) of the
BKSU. The MPB contains a lithium dry-cell to maintain memory and
real-time clock functions. The battery is soldered to the MPB and
connected to the circuitry by an On-Off DIP switch. Make sure the DIP
switch is ON before the MPB installation.
The MPB may be equipped with three daughter boards: A MEMU for
memory expansion, a MODU for modem access to the system, and a
PLLU for T-1 synchronization. Refer to
utilized at this time.
The MPB also has an eight position dip switch. The following is the
function of each switch position:
Switch 1
Switch 2
Switch 3
Switch 4 Handshaking
Switch 5
Switch 6 Tests
Switch 7 Status
Switch 8 DB Flush
Table 2-1: MPB Switch Positions
Not Used
Not Used
Not Used
ON: XOFF/XON
OFF: CTS/RTS
Not Used
ON: Execute H/W tests at start up
OFF: Skip H/W tests at start-up
ON: Display start up status at start-up.
OFF: No start-up display status
ON: Flush the database
OFF: Retain the database
Use extra care when removing RS232 cables from the Triad 1/2/3 MPB or
SIU boards. Hold the MPB/MISU card in the card slot before removing the
RS232 cable.Failure toperformthis action mayresult intheMPB/MISU card
being pulled from its' slot.
Main Processor Board (MPB) Installation
Figure 2-12. The MEMU is not