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ADCP-61-471 • Issue 4 • June 2000 • Section 2: Operation and Maintenance
2-65
© 2000, ADC Telecommunications, Inc.
DLP-519
Page 1 of 3
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.