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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
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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
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1 Introduction
1
Introduction
1.1
Notations and Abbreviations
Table 1-1
Notation /
Abbreviation
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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
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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.
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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
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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
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