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Chapter 1: Introduction
As a DAS, the module or standalone hub that houses the DELHF-UA
connects directly to the FDDI primary ring. This provides the reliability
of an FDDI dual, counter-rotating ring topology. If one segment of the
FDDI ring becomes disabled, this dual ring configuration provides
redundancy and restores ring continuity.
As a SAS, the DELHF-UA connects to the primary ring only by using a
single FPIM on the DELHF-UA to attach to the M port of an FDDI
concentrator.
The DELHF-UA also supports dual homing. A dual homing configuration
provides additional redundancy for the module or hub containing the
DELHF-UA. Dual homing is a way of connecting to an FDDI ring
through the Master (M type) ports of two separate dual attached
concentrators. If one M type port or one segment fails, the redundant port
or segment activates automatically to retain connection to the ring.
The DELHF-UA is also capable of operating in full duplex mode, which
creates a point-to-point link between two FDDI devices. This allows for a
data rate of 200 Mbps, with each device transmitting and receiving at
100 Mbps simultaneously. Chapter 3, Local Management, provides
instructions on configuring the DELHF-UA to operate in full duplex
mode.
Bridging
The DELHF-UA provides translational bridging between any channels or
ports in its host module or hub and the FDDI ring.
LANVIEW Diagnostic LEDs
DIGITAL provides a visual diagnostic and monitoring system called
LANVIEW from Cabletron Systems. The DELHF-UA LANVIEW LEDs
help you quickly identify transmit/receive, link, and FDDI ring status.
Chapter 4, LANVIEW LEDs, provides information on all DELHF-UA
LEDs.
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DELHF-UA User's Guide
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