Summary

This Recommendation defines error performance parameters and objectives for international digital paths which operate at or above the primary rate. The objectives given are independent of the physical network supporting the path. This Recommendation is based upon a block-based measurement concept using error detection codes inherent to the path under test. This simplifies in‑service measurements. The parameters and objectives are defined accordingly.

Annexes A, B, C and D deal with the definition of availability of the path and give specific information concerning PDH, SDH and cell-based transmission paths.