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Installation and Maintenance
V
olume
Octel Overture 200/300 Serenade 3.0
PB60014–01
The
motherboard includes signaling for two separate SCSI buses on shelf B: the system/voice SCSI
bus and the W
orks for Serenade
SCSI bus. The system/voice SCSI bus interconnects slots B2 through
B4. The W
orks for Serenade
SCSI bus connects to slot B1. The motherboard includes an ID signal
field for each slot. This ID field is used by the plug-in disk assemblies for SCSI bus ID selection.
The message server motherboard provides the reset signal. This signal is activated when the power is
turned on, which resets all boards in the message server
.
Octel Overture 300 Motherboards
Shelf
A Motherboard
The
main motherboard is installed in shelf A and distributes d.c. power to shelf A cards.
The shelf A motherboard includes signal interconnections from slots A1 through A12 to connectors
P1 through P12, respectively
. These connectors are used for external circuit connections 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 through connector P1.
Shelf
B Motherboard
The
shelf B motherboard includes signaling for two separate SCSI buses: the system/voice SCSI bus
and the W
orks for Serenade
SCSI bus. The system/voice SCSI bus interconnects slots B3 through B5.
The W
orks for Serenade
SCSI bus interconnects slots B1 and B2. This motherboard distributes
+5-volt and +12-volt power to slots B1 through B5. It includes an ID signal field for each slot. This
ID field is used by the plug-in disk assemblies for SCSI bus ID selection.
Slot B5 is used for the load/backup device and includes SCSI bus signal connections and power
connections. In the case of a floppy device installed in this slot, only power is provided from the
motherboard to the floppy device. The floppy device does not use the SCSI connection.
The shelf B motherboard provides a +12-volt power connection to the fan tray
.
Shelf
C Motherboard
The
shelf C motherboard provides a system/voice SCSI bus connection, power distribution, and ID
signals to disk assemblies installed in slots C1 through C4.
Option Control Chip (OCC)
The
Option Control Chip (OCC) is located on the motherboard, directly behind the PSU.
.
For the Octel Overture 300, the OCC is on the shelf A motherboard.
The OCC contains information about the message-server configuration, the number of voice and fax
mailboxes authorized, and the feature options the Octel Overture 200/300 is equipped with.
The OCC must always remain with the message server it was purchased for
.
If the motherboard must
be replaced, the OCC must be transferred from the old motherboard to the replacement motherboard.
Refer to the Hardware Replacement, Option Control Chip Replacement section, in this manual.