Replacement DELNI Installation and Operating Information

This document is a comprehensive manual for the installation, operation, and troubleshooting of the replacement Digital Ethernet Local Network Interconnect (DELNI) unit, produced by Digital Equipment Corporation in February 1992.

Key aspects of the document include:

• Product Overview: The DELNI is an electronic device that allows up to eight Ethernet workstations to communicate, serving as a physical-layer component of an Ethernet system. The "replacement" unit features newer technology for increased reliability and a redesigned casing for easier rack mounting compared to the original.

• Configurations: It details various DELNI network arrangements, including:

  • Standalone DELNI LAN: Connecting up to eight local workstations.
  • Cascaded DELNI Units: Connecting multiple DELNI units to expand the network.
  • Wide Area Ethernet: Connecting DELNI LANs to a larger Ethernet system via an Etherjack junction box or network transceiver.

• Installation: Provides step-by-step instructions for both:

  • Tabletop Installation: Including connecting workstation cables, installing a cable support, selecting voltage, and powering on.
  • Rackmount Installation: Detailing how to prepare the DELNI with brackets and secure it in a standard 19-inch rack.

• Operation: Explains the "Local/Global" push button and corresponding LEDs, which control whether the DELNI operates as a standalone unit or connects to a larger network.

• Troubleshooting: Offers guidance for identifying and resolving common problems, such as power faults (unlit LEDs), incorrect Local/Global configuration, and other hardware issues (e.g., faulty workstation, cable, or the DELNI unit itself, emphasizing that internal DELNI repairs require returning the unit to Digital). It also briefly mentions software as a potential, though indirect, source of communication problems.
• Service Options: Outlines how to obtain support from Digital Equipment Corporation, including contact information, preparation before calling, and a description of various services like on-site, carry-in, network planning, and maintenance agreements.
• Technical Appendices: Includes instructions for connecting cables to an Etherjack junction box and crucial Ethernet controller cable length restrictions for different DELNI configurations.