ADCP-61-471 • Issue 4 • June 2000 • Section 2: Operation and Maintenance

DLP-519

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MPU REPLACEMENT AND TESTING

Summary

This procedure provides instructions for installing a previously configured MPU in a chassis (whether provisioned or not) and verifying that the MPU is functioning. When an MPU from a provisioned chassis is moved to another chassis, the chassis unit (module) configurations may not match the MPU unit configurations. These instructions explain how to avoid unwanted data replacements or data conflicts. The MPU contains both general configuration data and unit configuration data.

All configuration data can be restored to the MPU by performing a database upload or download procedure. The upload is outlined in DLP-554 (Configuration Data Upload Command), and the download is outlined in DLP-555 (Configuration Data Download Command).

General Configuration Data

System administration and maintenance tasks create general configuration data (alarm levels, PM thresholds, system identification, port configuration, and user account data).

Unit Configuration Data

Individual module configurations create unit configuration data (which includes unit service state, framing, line coding, etc.) Unit configuration data does not need to be re-entered as long as the chassis remains powered and transmission units remain installed. Unit configuration data is also stored in the transmission units and is loaded back into a non-configured MPU automatically.

Note: When installing a replacement MPU module, use the same DIP or rotary switch settings on the MPU’s printed circuit board as the MPU you are removing.

Note: When an MPU is removed from a powered-up chassis, the MPU retains both general and unit configuration data for at least 24 hours. Do not install a still-configured MPU in an already-configured chassis. If you want to retain unit configuration data in all transmission units (or prevent alarms) and you are installing a previously configured MPU, verify that the MPU’s unit configuration data is gone before you re-install it.

Caution: Do NOT re-install MPUs with revisions older than 3.1, or MPUs that have an older revision than the currently installed MPU. A corrupted database may result.

Caution: Electronic modules can be damaged by electrostatic discharge (ESD). Before handling modules, wear an anti-static discharge wrist strap to prevent damage to electronic components. Place modules in anti-static packing material when transporting or storing. When working on modules, always place them on an approved anti-static mat that is electrically grounded.

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