DEC WANcontroller 618 Problem Solving

This document, "DEC WANcontroller 618 Problem Solving," serves as a troubleshooting guide for the DEC WANcontroller 618.

It outlines a systematic approach to diagnosing and resolving issues, primarily focusing on:

1. NIC LED States: Explaining what different LED indicators (Slow flash, Fast flicker, READY, HOTSWAP, FAULT, ATTENTION) on the Network Interface Card (NIC) signify for initial diagnosis.
2. Problem Solving Flowchart: A step-by-step decision tree that directs users through diagnostic procedures based on the NIC's LED state.
3. Diagnostic Procedures:
   • Checking operational communication ports using NCL (Network Control Language) commands.
   • Performing Module Loopback Tests to verify the NIC's functionality.
   • Performing NCL Loopback Tests for distribution panels and synchronous cables.
4. Component Replacement: Guidance on replacing faulty components like NICs, distribution panels, connecting cables, and extension cables, with a strong emphasis that certain procedures (e.g., NIC replacement) should only be performed by service personnel.
5. Referenced Resources: It points to other related DECNIS manuals (Installation and Service, Event Messages, NIC Problem Solving cards) for further details on hardware, software, and event-specific troubleshooting.