Overview Of Precision Time Protocol Mode (Ieee 1588) - Teledyne FLIR A68 Series User Manual

Overview of Precision Time Protocol Mode (IEEE 1588)

PTP Mode = Precision Time Protocol
• The PTP protocol synchronizes the Timestamp clocks of multiple devices connected
via a switch on the same network, where the switch supports forwarding of PTP
messages.
• For optimal clock synchronization the imaging network should use one Ethernet
switch. Daisy-chaining multiple small switches will degrade camera clock syncs.
• A68/A38 cameras can automatically organize themselves into a master-slave
hierarchy, or the user application configures a camera master with n-number of
slaves.
• The automatic organizing procedure is composed of steps (as defined by IEEE 1588)
to identify the best clock source to act as master. When only A68/A38 cameras are
used, since they are equal, the last selection step is to identify the A68/A38 with
lowest value MAC address to be the clock master.
• The feature TimeStampSource is automatically changed to IEEE1588 when PTP
Mode is enabled.
• The A68/A38 cameras implement additional features designed to synchronize
multiple camera acquisitions via IEEE 1588 (PTP Mode) – for example using
timestamp modulo events, not via external camera trigger signals.
PTP Master Clock Identity
The clock ID of the current best master is an Extended Unique Identifier (EUI)-64 "64-
bit ID", converted from the 48-bit MAC address, by inserting 0xfffe at the middle of the
MAC address.
• The standard MAC address in human-friendly form is six groups of two hexadecimal
digits as this example shows (excluding hyphens ): "0a-1b-2c-3d-4e-5f"
• The Extended Unique Identifier format is (excluding hyphens): "0a-1b-2c-ff-fe-3d-
4e-5f"
134 • Operational Reference FLIR A68/A38 Series IR Camera User's Manual