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Chapter 9
IEEE 1588 Analysis
xGenius may optionally supply IEEE 1588 version 2, also known as Packet Time
Protocol (PTP), emulation and analysis features.
Some of the potential applications for the IEEE 1588 emulation and testing capabilities
included in xGenius are:
• PTP grandmaster emulation synchronized with an external clock source based on
GNSS, 1544 kHz, 2048 kHz, 1 PPS, ToD, Synchronous Ethernet and other inter-
faces.
• PTP slave emulation with extended performance measurements from the associ-
ated grandmaster and network, including master identity and status, PDV analysis
and frequency / phase offsets.
• PTP pseudo-slave operation. In this mode the test unit behaves in the same way
than any standard PTP slave but indeed does not get synchronization from any
IEEE 1588v2 grandmaster but from a clock reference chosen by the user. This
test enables evaluation of metrics to quantify slow phase perturbations in the PTP
timing such as TE, MTIE and TDEV. The Floor delay population test is also to be
run in this operation mode.
• Passive monitoring testing of the communication between PTP master and slave.
Connection of the passive monitor could be done in end-point or pass-through
modes. Supported monitoring tests are related with master identity and status,
PDV analysis and frequency offset.
9.1.Ethernet Synchronization with IEEE 1588
The Precision Time Protocol (PTP), included in IEEE standard 1588 was originally
designed to provide timing for critical industrial automation. With the 2008 version of
this standard (IEEE 1588v2), PTP overcomes effects of latency and jitter through
chains of Ethernet switches, providing accuracy in the nanosecond range.
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