for traffic interfaces (output jitter, output wander) Network limits for synchronization interfaces (output jitter, output wander) for clocks of differ- ent quality, such as primary reference clocks (PRC), synchronization supply units (SSU), SDH equipment clocks (SEC), and plesiochronous digital hierarchy (PDH) Jitter and wander (input) tolerance of traffic and synchronization interfaces Annex A, "Network model underlying the synchronization network limit" Annex B, "Network wander reference model and parameters" Appendix I and II: Cover consideration and measurement methods for wander G.823 is more than 20 years old. To read the complete recommendation, you only need to read the latest recommendation from 2000. Since this applies to circuits based on the 2048-kbps system, it interests only those regions using European type circuits, which is most places except for the United States, Canada, and Japan. Link to recommendation: https://www.itu.int/rec/T-REC-G.823/en G.824: The Control of Jitter and Wander Within Digital Networks Which Are Based on the 1544 kbit/s Hierarchy ITU-T G.824 covers the network limits for jitter and wander for traffic and synchronization net- works based on the 1544-kbps hierarchy. The electrical characteristics of these interfaces are defined in G.703. This is basically the T1 version of G.823. From the scope of the recommendation: An excessive amount of jitter and wander can adversely affect both digital (generation of bit errors, uncontrolled slips) and analogue signals (unwanted phase modulation of the trans- mitted signal). It is therefore necessary to set limits to the presence of jitter and wander at the network interfaces, in order to guarantee a proper quality of the transmitted signals. This recommendation includes the following main topics and annex: Network limits for traffic interfaces (output jitter, output wander) Network limits for synchronization interfaces (output jitter, output wander) for PRC clocks and 1544 reference interfaces Jitter and wander tolerance of traffic (in