InternalInternal
This option uses the timestamp generated inside the Network Master.
You can measure one-way latency by receiving Ethernet frames from another
Network Master. To do this, you need to synchronize two Network Masters'
timestamp with GPS. Note that, after the clocks are synchronized with GPS,
they run without synchronization between two Network Masters. This causes
time difference between the clocks as the time elapses.
The degree of the difference depends on the internal clock accuracy that is
listed in External Interfaces in the MT1040A Specifications.
For how to synchronize timestamp with GPS, refer to Timestamp
Synchronization Procedure.
When Source is switched to InternalInternal from other options, timestamps behaves
as follows:
When the application has already been running on other ports with
Timing source set to InternalInternal.
Timestamps synchronize with those of the other ports.
When no other ports are used and GPS signal is not received:
Timestamps start from any time.
When no other ports are used and GPS signal is received:
Timestamps start from GPS time.
GPSGPS
This option uses the timestamp generated based on TOD (Time of Day) signal
and 1PPS signal which are provided by the GPS receiver
G0325A GPS Receiver or MU100090A can be used. The 10 MHz clock provided
by MU100090A is not used for generating the timestamp.
One way latency can be measured.
1PPS (Ext ref. 10MHz)1PPS (Ext ref. 10MHz)
This option uses the timestamp generated based on 1PPS signal and 10 MHz
clock which are provided by the GPS receiver. By using 10 MHz clock, the
measurement can be performed in higher accuracy than the one when
selecting GPSGPS.
One way latency can be measured.
Due to using 1PPS signal, the latency of one second or less than can be
measured.
This option allows users to use other vendor's GPS other than G0325A and
MU100090A. In this case, J1705A AUX Conversion Adaptor is required.
GPS (Ext ref. 10MHz)GPS (Ext ref. 10MHz)
This option uses the timestamp generated based on TOD (Time of Day) signal,
1PPS, and 10 MHz clock which are provided by MU100090A. By using 10 MHz
clock, the measurement can be performed in higher accuracy than the one
when selecting GPSGPS.
One way latency can be measured.
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