Planet IGS-10020, Руководство пользователя

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User’s Manual
367
4.19 PTP (IGS-12040MT/20040MT/20160HPT Only)
The
Precision Time Protocol
(
PTP
) is a protocol used to synchronize clocks throughout a computer network. On a local area
network, it achieves clock accuracy in the sub-microsecond range, making it suitable for measurement and control systems.
PTP was originally defined in the
IEEE 1588-2002
standard, officially entitled
"Standard for a Precision Clock Synchronization
Protocol for Networked Measurement and Control Systems"
and published in 2002. In 2008 a revised standard,
IEEE 588-2008
was released. This new version, also known as PTP Version 2, improves accuracy, precision and robustness but is not
backwards compatible with the original 2002 version.
"IEEE 1588 is designed to fill a niche not well served by either of the two dominant protocols,
NTP
and
GPS
. IEEE 1588 is
designed for local systems requiring accuracies beyond those attainable using NTP. It is also designed for applications that
cannot bear the cost of a GPS receiver at each node, or for which GPS signals are inaccessible."
4.19.1 PTP Configuration
This page allows the user to configure and inspect the current PTP clock settings. screen in Figure 4-19-1 appears.
Figure 4-19-1:
PTP Configuration Page Screenshot
The Page includes the following fields:
Object Description
•
Delete
Check this box and click on 'Save' to delete the clock instance.
•
Clock Instance
Indicates the Instance of a particular Clock Instance [0..3].
Click on the Clock Instance number to edit the Clock details
•
Device Type
Indicates the Type of the Clock Instance. There are five Device Types.

Ord-Bound - clock's Device Type is Ordinary-Boundary Clock.

P2p Transp - clock's Device Type is Peer to Peer Transparent
Clock.

E2e Transp - clock's Device Type is End to End Transparent
Clock.

Master Only - clock's Device Type is Master Only.