DEC WANcontroller 622 Problem Solving

This document is a problem-solving guide for the DEC WANcontroller 622 and the DEC Network Integration Server, focusing on diagnosing and resolving hardware and cabling issues.

Key aspects of the document include:

• NIC LED States: It defines the meaning of various LED indications (e.g., slow flash, fast flicker, ready, hotswap, fault, attention) on the Network Interface Card (NIC), which are crucial for initial diagnosis.
• Problem Solving Flowchart: A central flowchart guides users through troubleshooting steps based on the observed NIC LED state.

• Diagnostic Procedures: Detailed instructions are provided for:

  • Module Loopback Test (NIC): To check the basic functionality of the NIC itself.
  • NCL Loopback Test (Cables): Using Network Control Language commands to test adapter and extension cables.
  • Synchronous Cable Checks: Procedures for identifying faulty cables through substitution, especially when software is not loading.

• Replacing Faulty Components: Guidance on when and how to replace the NIC, adapter, or extension cables, often emphasizing that NIC replacement should be performed by a service person.

• It references other manuals like the "Installation and Service Manual" for more detailed information and advises contacting "Digital Services" if problems cannot be resolved.