NEC Univerge sv8500 Manual page 2722

7.9 Maintenance Procedure
7.9.1 General
This section explains system messages pertaining to the DRU/DAU, the procedure of fault diagnosis by loop-
back tests between the Telephony Server and the DRU/DAU, and the fault repair procedure. For other matters,
refer to the Operations and Maintenance Manual.
7.9.2 System Message
System messages are displayed during routine diagnosis, system operation status controlling, and fault occur-
rences. This section explains, for each system message related to DRU/DAU shown in table listed on the next
page, the following items:
• Meaning
• Related System Message
• Example of Printout
• Message Detail Data
• Diagnostic from System Message
For system messages that are not explained in this chapter, refer to the Operations and Maintenance Manual.
Section 7.9.3: Technical Terms for Explaining Message Detail Data
Note 1:
explanation.
Section 7.9.5: How to Proceed with Diagnostic Work from System Message
Note 2:
agnosis.
Note 1
Note 2
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CHAPTER 2 TERMINAL-RELATED DEVICES
explains technical terms used in the
explains how to perform di-