Shelf A Motherboard; Option Control Chip (Occ) - Toshiba VP 300 Installation Instructions Manual

1-12 Installation and Maintenance Manual
I Shelf A Motherboard
The main Motherboard is installed in shelf A. DC power is distributed to shelf A cards via this
Motherboard.
The shelf A Motherboard includes signal interconnection from slots A1 through A12 to connectors P1
through P12, respectively. These connectors are used for external circuit connection to cards installed
in the respective slots. For example, a line card installed in slot A1 connects to tip and ring circuits of
a telephone network via connector P1.
I Option Control Chip (OCC)
The Option Control Chip (OCC) is located on the Motherboard in shelf A, directly behind the PSU.
The OCC holds information concerning the system configuration and software options the VP 300 is
equipped with.
The OCC must always remain with the system it was purchased for. If the Motherboard requires
replacement, the OCC must be transferred from the old Motherboard to the replacement Motherboard.
Refer to MAINTENANCE, Option Control Chip Replacement, in this manual.
Toshiba VP Systems Release 7.1 July, 1994