Linea2 5GigE Series Camera
Operational Reference
•
103
Overview of Precision Time Protocol Mode (IEEE 1588)
PTP Mode = Precision Time Protocol
•
PTP synchronizes the Timestamp clocks of multiple devices connected via a switch on the same
network, where the switch supports PTP.
•
For optimal clock synchronization the imaging network should use one Ethernet switch. Daisy-
chaining multiple small switches will degrade camera clock syncs.
•
Additionally, the Ethernet switch connecting cameras to the imaging network should implement
“PTP Boundary Clock” hardware.
•
To use a multi-port NIC adapter instead of a switch, it must be configured as the common
Master PTP source for all its networks. Refer to
NIC’s
configuration software instructions.
•
Linea2 cameras can automatically organize themselves into a master-slave hierarchy, or the
user application configures a camera master with n-number of slaves. The auto-configuration
process typically happens within 2 seconds.
•
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 Linea2 cameras are used they are equal and
the Linea2 with lowest MAC address value is set to clock master.
•
The feature
TimeStamp Source
is automatically changed to
IEEE1588
when
PTP Mode
is
enabled. This timestamp tick (in ns) cannot be reset by the user.
•
Linea2 cameras implement additional features designed to synchronize multiple camera
acquisitions via IEEE 1588 (PTP Mode)
–
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 is a 64-bit ID, converted from the 48-bit MAC address, by
inserting 0xfffe at the middle of the MAC address. The format is (excluding hyphens
): “0a
-1b-
2c-fffe-3d-4e-
5f”
