RECOMMENDATION ITU-R F.753* - PREFERRED METHODS AND CHARACTERISTICS FOR THE SUPERVISION AND ... ANNEX 1 1. Preferred supervisory principles 2. Protection principles - Performance and availability 2.1 Performance measuring 2.2 Failure dectection 2.3 System protection 2.4 Failure/performance information transfer 2.5 Fault localization 2.6 Logistic delay 2.7 Fault correction 2.8 Verification 2.9 System restoration 3. Methods and characteristics of protection 3.1 General 3.2 Need for protection 3.3 Types of protection arrangements 3.4 Factors influencing the choice of switching criteria 4. Service channel considerations 4.1 Transmission of supervision and control signals for regenerator stations 4.2 Transmission of supervision and control signals between SDH radio-relay stations APPENDIX 1 OF ANNEX 1 - Optimum pulse shape and maximum capacity for supervision and control signal ...