Fundamental to any communications system is the ability to discover, isolate, and remedy problems as quickly as possible to minimize or eliminate the degree to which users are impacted.

Loop-Back Capability
PCM loop-back is used for diagnosing problems related to the telephony side. Packet-send loop-back diagnoses problems related to DSP software performance. Packet-receive loop-back diagnoses problems related to the packet network.

Signal-Level Measurement
The software described in this tutorial can perform signal-level measurements on the telephony-side interface for a particular channel. It reports instant and mean values for signal power in both directions.

Packet Network Statistics
The software generates an extensive set of performance statistics for each channel. The statistics include number of transmitted and received packets, minimum and maximum packet interarrival times (i.e., jitter measurement), number of invalid packet headers, and number of lost packets. In addition, the voice playout unit reports number of lost voice frames, number of repeated frames, number of idle frames, number of dropped frames, and average packet jitter.

PCM Sample Trace
The DSP software can provide 10 milliseconds of PCM samples (approximately 80 samples).

Memory Trace
The DSP software can provide 40 memory values, starting from the requested location. Memory locations can be from data memory or program memory.

Fax Processing Debug
TI's Telogy Software™ products provide a stream of debug information tracing the performance of fax operations.

Echo Canceller Statistics
The software offers a detailed set of echo-canceller debug statistics.