
Chapter 10 Testing, Troubleshooting, and Diagnostics 431
Business Communications Manager - Management User Guide
DTM CSU statistics
Each DTM has an internal channel service unit (CSU). When enabled, the internal CSU monitors
the quality of the received T1 signal and provides performance statistics, alarm statistics and
diagnostic information.
DTMs must be individually programmed to establish parameters for collecting and measuring
transmission performance statistics by the CSU.
For more information, refer to:
• “Statistics collected by the system” on page 431
• “Enable the internal CSU” on page 432
• “Check the performance statistics” on page 432
• “Check the CSU alarms” on page 433
• “Check carrier failure alarms” on page 433
• “Check bipolar violations” on page 433
• “Check short term alarms” on page 434
• “Check Defects” on page 434
• “Reset all statistics” on page 434
Statistics collected by the system
The system accumulates three performance parameters:
• errored seconds (ES)
• severely errored seconds (SES)
• unavailable seconds (UAS)
These parameters are defined as per TIA-547A. Errored seconds are enhanced to include control
slip (CS) events. Only near-end performance data is recorded.
The internal CSU continuously monitors the received signal and detects four types of transmission
defects:
• any active carrier failure alarms (CFA) (loss of signal LOS, out of frame OOF, alarm
indication signal AIS, remote alarm indication RAI)
• the number of bipolar violations that occurred in the last minute
• any defects (loss of signal LOS, out of frame OOF, alarm indication signal AIS) that occurred
in the last minute
Note: To end the test at any time, click Stop loopback on the Configuration menu.
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