Module ModelModule Model
Round Trip timeRound Trip time One Way LatencyOne Way Latency
SourceSource SourceSource GPS receiver to be usedGPS receiver to be used
MU100010A Internal GPS
G0325A or
MU100090A
MU100011A,
MU104011A,
MU104014A,
MU104015A
Internal
GPS G0325A
1PPS(Ext ref. 10MHz)
GPS receiver provided
by other than Anritsu
MU100090A
*1
GPS(Ext ref. 10MHz)
MU100090A
*2
*1: When the MU100090A is feeding 1PPS and 10 MHz clock to two MT1040As.
*2: When the MU100090A is feeding 1PPS and 10 MHz clock to one MT1040A.
InternalInternal
This option uses the timestamp generated inside the Network Master.
When InternalInternal is selected, you can measure latency by receiving Ethernet
frames from other Network Masters. To do this, you need to synchronize two
Network Masters' timestamp with GPS once. Note that clocks run without
synchronization between two Network Masters after synchronizing with GPS,
the time difference between them raises along with the elapsed time.
The degree of the difference depends on the internal clock accuracy whose
specification is listed in External Interfaces in MT1040A Specification.
For the procedure to synchronize timestamp with GPS, follow the Timestamp
Synchronization Procedure.
When Source is switched to InternalInternal from other options, timestamps behavior
are the followings:
When the application has been already running on other ports with
setting Timing source 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
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
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