The Nokia (formerly Siemens) EWSD Switching Support Course was created to help telco personnel continue to support the EWSD switching system with less reliance on vendor support options.
Intended as a follow-up to the EWSD Maintenance and Operations course, the support course will move personnel with a good working knowledge of the EWSD to the next level, providing them with both the knowledge and confidence to work on important parts of the switch for which they are less familiar. The course begins with a review of the system topology, ensuring a consistent understanding of the different LTG and DLU types, and remotes. The discussion then turns to the front end, with detailed descriptions of the Coordination Processors IOP Groups, its various processors, Common and Local Memory, plus various interfaces including X.25, serial, SCSI, etc. Significant detail is placed on the different SN network types, including DE345, and their various TimeSpace stage sub-configurations. An emphasis is placed upon the configuration for the local switch system that students work on.
DISP and SRCHALARM commands, plus MMN, FLM and Mask information within the system output messages, are all used to locate as much information about a fault as possible. A large number of past examples are used as practice, but any actual faults in the switch will also be analyzed carefully for the best course of troubleshooting. Predictions are made for the card modules that are most suspect. These results are then compared to the actual fixes performed from the past examples, and also to current maintenance-window diagnostic results, if applicable. Module replacement precautions and procedures are discussed in detail, including communication between COT personnel and the NOCSCC or other Tier-3 support.
Books such as the Exchange Configuration Document (ECD) and Cable Laying List (CLL) will be consulted to see how to find suspect cables and their part numbers, including their exact location on the backplane.
Our non-intrusive exercises equip the student to apply troubleshooting techniques for challenging faults, and then determine suspect module lists, including cables. The course is flexible, allowing the most important content for a particular group of students to be emphasized.
Students Will Learn: