R31DS0087EU0101 Rev.1.01

Page 29

Sep.28.21

pcm4l Datasheet

5.2 PDV Tolerance

5.2.1

Time Noise Tolerance for PTS - G.8273.4 Clause 8.3 (using G.8275.2 Profile)

For test details, see the Calnex Test Guide CX3013. This test checks whether the equipment clock can maintain

network limits at the output (max|TE|L < 1350ns) with maximum noise at the input.

▪ Reference Model 1 (NoBCs_HighStablility) – Network Topology with no intermediate time-aware devices

▪ Reference Model 2 (WithBCs_NormalStablility) – Network topology of three islands, or two time-aware bridging

devices

The High Stability PDV profiles model a packet selection characteristic per below (based on G.8271.2):

▪ Selection window = 200s

▪ Selection percentage = 0.25% fastest packets

The pattern is then normalized so that the peak-to-peak pktSelected2wayTE is <1100 ns.

The following figures show the TE performance at the output for the two reference models.

Figure 12. Reference Model 1 (652nspp)