DIN EN 61280-2-11:2006-11

0 INTRODUCTION
  0.1 Background
  0.2 Averaged Q-factor formula
1 Scope
2 Normative references
3 Terms and definitions
4 Abbreviated terms
5 Apparatus
  5.1 Optical bandpass filter
  5.2 Receiver
  5.3 Clock oscillator
  5.4 Electrical pulse generator
  5.5 Sampling module
  5.6 Signal processing circuit
  5.7 Monitoring system parameters
6 Procedure
  6.1 Equipment connections
  6.2 Threshold level definitions
7 Calculations
Annex A (normative) Measurement accuracy, reliability, and
                       sensitivity
Annex B (informative) Crosstalk and frequency detuning of
                       optical bandpass filter
Annex C (normative) Highest limit of Q[avg]
Annex D (informative) Bit rate dependence
Annex E (informative) Format dependence
Annex F (informative) Dependence of Q[avg], sigma[1,avg], | mu[1,avg] -
                       mu[0,avg] |, and Q on chromatic dispersion
                       and OSNR
Annex G (informative) Relationship between Q[ave] and Q
                       with PMD impairment
Annex ZA (normative) Normative references to international
                       publications with their corresponding European
                       publications
Bibliography

Specifies the averaged Q-factor and provides a procedure to measure it by using amplitude histogram parameters such as the standard deviation and average level.