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T200
Time
sync properties -
Real time -
Industrial use -
Reliability -
Easy installation -
TX
or FX -
Ordering information -
Downloads
T200 - Time sync
properties
High
accuracy SNTP/NTP time server
The T200 can be configures as a high accuracy SNTP/NTP time server
with an accuracy better than 500ns independent of the network load.
End nodes connected to a T200 can be synchronized with an accuracy
of less than 1 µs to UTC independent of network load. In order to
achieve 1µs accuracy on the end node, some hardware support is
needed. In order to achieve accuracy in the range of 10 µs no
extra hardware is needed to the end node. Using OnTime's PC based
management tool configuration and monitoring is easy.
The following unique time synchronzation properties makes the T200
SNTP/NTP time server different from other SNTP/NTP implementations:
1.) Time stamping of incoming and outgoing time packets are
performed at PHY level. This means that the variable packet
latency through the switch core has no impact on the timing
accuracy.
2.) Deterministic access of the SNTP/NTP reply packets to the
Ethernet wire by using OnTime patent proven techniques solves the
main disadvantage of the SNTP/NTP protocol.
SNTP client - IRIG-B - serial time sync
The T200 can act as a time sync bridge. That means that clock data
from the Ethernet is forwarded to another medium. I.e. the T200
acts as a SNTP time client, synchronized its local clock based on
clock updates performed vs. a T200 running a SNTP/NTP server and
forward this time sync information to:
- An optical output (850nm) by using the IRIG-B protocol
- Serial output (RS232 or RS422) by using a UTC string, where the
second increments are associated to the ETX character.
This means that T200 SNTP/NTP clock is distributed over Ethernet
to SNTP/NTP Ethernet clients as well as for end nodes that require
time sync input over serial or optical line.
IEEE 1588
The T200 can also operate according to the IEEE 1588 standard
either as an IEEE 1588 Grand Master clock or as an IEEE 1588
Transparency switch.
An accuracy of a few tens of nanoseconds independent of the
network load (as for the SNTP/NTP implementation) is provided if
the T200 is configured as an IEEE 1588 Grand Master clock.
IEEE 1588 Transparency are relevant for the T200 switches not
acting as IEEE 1588 Grand Masters. These switches handles the
variable latency through the T200 switch. End-to-end independence
of the network load are achieved if all the switches on the
network path between a given IEEE 1588 Slave and the IEEE 1588
Grand Master are IEEE 1588 Tranparency enabled. See here for
details about the IEEE 1588 technology.
Time base
We recommend and deliver Trimble Accutime 2000 as a turn key
solution. The GPS receiver is integrated in the GPS antenna and
both RS422/485 and RS232 are supported for the SNTP/NTP server or
IEEE 1588 Grand Master implementation.
See
www.trimble.com/acutime2000.html for more details.
With our turn key solution cable length between the GPS receiver (integrated
in the antenna) can be up to 1000m and GPS locked timing can be
achieved with only one GPS satellite.
Products;
Lynx -
T200
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R200 -
U200 -
U100
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