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DPP Product Guide DPP001 and up
2-A0379820
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DPP Hardware
The following subsections describe the various hardware components for the
DPP:
• System description
• Component description
• Disk drive description
• Switch and Status Panel description
• Equipment list.
System description
Chassis organization
The DPP consists of two processor units physically connected together.
Figure 2-1 provides a view of the general appearance of the DPP. The two
processor units are electronically linked through crossover capability, which
enables either unit to communicate with either of the disk drives. This feature
safeguards against the loss of billing data in the event of a circuit fault. The
two units are functionally identical, each with a power supply and disk drive.
During normal operation, only one of the units is doing the work, with the
other unit in a warm standby mode. All data is written to both disk drives.
Only one of the disk drives is accessed for read operations. In the event of a
system malfunction, operation is automatically switched to the warm standby
unit.
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