How to configure the NTP Settings for the CPEs

FAQ 10/2014
How to configure the NTP
Settings for the CPEs
RUGGEDCOM WIN5100, RUGGEDCOM WIN5200
http://support.automation.siemens.com/WW/view/en/103155852
This entry is from the Siemens Industry Online Support. The general terms of use
(http://www.siemens.com/terms_of_use) apply.
Security
information
Siemens provides products and solutions with industrial security functions that
support the secure operation of plants, solutions, machines, equipment and/or
networks. They are important components in a holistic industrial security
concept. With this in mind, Siemens’ products and solutions undergo continuous
development. Siemens recommends strongly that you regularly check for
product updates.
For the secure operation of Siemens products and solutions, it is necessary to
take suitable preventive action (e.g. cell protection concept) and integrate each
component into a holistic, state-of-the-art industrial security concept. Third-party
products that may be in use should also be considered. For more information
about industrial security, visit http://www.siemens.com/industrialsecurity.
To stay informed about product updates as they occur, sign up for a productspecific newsletter. For more information, visit
http://support.automation.siemens.com.
Siemens AG 2014 All rights reserved
Table of Contents
1
Introduction ........................................................................................................ 3
1.1
1.2
2
Notations and Abbreviations ................................................................ 3
General ................................................................................................. 3
Configuration ..................................................................................................... 4
2.1
2.2
NTP Settings CPEs
Entry-ID: 103155852,
BS configuration ................................................................................... 4
CPE Configuration................................................................................ 4
V 1.0,
10/2014
2
1 Introduction
1
Introduction
1.1
Notations and Abbreviations
Table 1-1
Notation /
Abbreviation
Siemens AG 2014 All rights reserved
1.2
BS
Base Station
CPE
Customer Premise Equipment
NTP
Network Time Protocol
LAN
Local Access Network
GMT
Greenwich Mean Time
General
NTP service in the CPE distributes a clock to any NTP client connected to the CPE
LAN port. The clock is received by the GPS on the BS and distributed to all
connected CPEs using a proprietary algorithm in a way that doesn’t lose clock
accuracy. As a result the time accuracy distributed by the NTP is very high and
limited by the error introduced by the NTP protocol itself and the time needed to
process NTP packets in the CPE.
If CPE disconnects from the BS, it shuts down the NTP service. NTP clients
connected to the CPE will not be able to receive updated time. When NTP server is
enabled in CPE, CPE will answer to any NTP client request.
If the BS loses GPS signal it will continue to distribute the BS internal clock.
NTP Settings CPEs
Entry-ID: 103155852,
V 1.0,
10/2014
3
2 Configuration
2
Configuration
2.1
BS configuration
BS configuration related to NTP includes single parameter “Time Advertisement
Enabled” in GPS screen as seen in the figure below, when this parameter is set to
TRUE, the BS will start to distribute the clock to all connected CPEs. Setting this
parameter to TRUE is essential for the NTP server operation in the CPE, since
there is no other clock source in the CPE.
Siemens AG 2014 All rights reserved
Figure 2-1: BS Time advertisement configuration
2.2
CPE Configuration
CPE NTP configuration includes single parameter Enable/Disable NTP server as
seen in the figure below.
NOTE
The time displayed on CPE WEB interface is always a GMT time.
NTP Settings CPEs
Entry-ID: 103155852,
V 1.0,
10/2014
4
2 Configuration
Siemens AG 2014 All rights reserved
Figure 2-2: CPE NTP Server Configuration
NTP Settings CPEs
Entry-ID: 103155852,
V 1.0,
10/2014
5