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Problem: Loss Plan

The primary purpose of a Loss Plan is to control the losses of all connections in a telephone network such that:

  1. the overall loss rating (OLR) of the end to end connection is approximately 10dB, which represents the optimum level
  2. the loudness at intermediate stages is not too low, in which case the signal to noise ratio may be too low and voice activity detectors in echo cancellers/suppressers may not function correctly
  3. the loudness at intermediate stages is not too high, in which case echo cancellers may not function correctly and amplitude clipping may occur.

Impact

An incorrect Loss Plan can lead to problems ranging from high levels of echo to phone calls that sound "dead"

Resolution

Develop a Loss Plan (see TIA TSB122 July 2000) and verify that Gateways, Phones etc. are properly configured to the correct levels.

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