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in standby mode , with one component online, while the other "stands by" to take over operation should its partner fail.
The DNCP Series 400 (PA-8500) must be installed by a qualified service technician, but most of the components are
customer-maintainable
. Its data communications subsystem, based on a Peripheral Component Interconnect (PCI) bus,
utilizes state-of-the-art PCI cards. Peripherals include T800-series cartridge tape and D85X CD-ROM drives, V105
terminals, and C419/C619 modems, which are described later in this chapter. See Figure 1.1 for an illustration of the
DNCP Series 400 (PA-8500) system installed in a typical computer-room environment. The sections that follow describe
DNCP Series 400 (PA-8500) components.
Figure 1.1. DNCP Series 400 (PA-8500) System in a typical computer-room environment
1.3a.1 DNCP Series 400 (PA-8500) Cabinet
Each DNCP Series 400 (PA-8500) consists of a single cabinet that houses all major system components. Two sets of doors
on the front and rear of the cabinet provide access to these components. The following sections describe the cabinet
components.
Cabinet: Front Components●
Rear Components ●
Chapter 1
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