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Chapter 8
DKUOOO-HDPI Dual-Port
Interface Option
This chapter assumes familiarity with the operation of the Dual-Port Interface, and
describes only certain of its features.
8.1 GENERAL DESCRIPTION
The Dual-Port Interface allows access to one drive by two controllers. In allowing dual
access, the interface functions as a switch that routes the necessary control and data
signals to and from the correct controller.
The electrical specifications of the Dual-Port Interface (including line receivers and
transmitters, cables and cable connectors, signal definitions, and pin assignments) are
the same as those of a standard D2246. The only difference is that D2246 disk drives
equipped with this option have two identical interfaces providing communications
channels with two controllers.
These two identical interfaces are designated port A and port B. Communication links
into and from port A are designated route 0; communication links into and from port B
are designated route 1. Each port is physically connected to its controller by an A and a B
cable.
Figure 8-1 shows a dual-port cabling diagram.
8-1
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