Master And Slave Clocks; Ptp Messages; Sending Configuration - GE Reason RT430 Technical Manual

GPS Grandmaster Clock
4.5.6

Master and slave clocks

RT430 is pre-configured to act as master of the synchronism network. The selection of the field force
operation as slave, allows the unit to be used as slave.
When RT430 is used as master, BMC algorithm tie breaking criteria priorities should be attributed. The fields
Grandmaster priority $\#$1 and $\#$2 allow configuring the priorities of both Ethernet ports, in which $\#$1 is
the first and $\#$2 is the last tie breaking criterion. Between the first and the last tie breaking criterion, other
clock characteristics are analyzed. The priority values can vary from 0 to 255. The lower the attributed value
is, the higher its priority is.
4.5.7

PTP Messages

In PTP protocol, messages containing synchronism information and timestamps are sent across the network
in multicast mode.
Announce messages are used to inform devices connected to the network about the existence of a master
clock available to send synchronism packets. The clock connected to the network operating as a master
should send Sync messages with synchronism information, and in case it is a two-step clock, it should also
send a Follow Up message containing the timestamp.
In RT430, it is possible to choose the frequency to send messages and the waiting time of Announce
message receipt, through the fields below:

The field Delay request interval allows choosing the frequency to send messages with delay
measurement. It is possible to configure the unit to send 16 messages per second until one
message every-32-seconds.

The field Announce interval allows choosing the frequency to send messages that apply the device
to become a network master candidate. It is possible to configure the unit to send 16 messages per
second until one message every-32-seconds.

The field Synch interval allows choosing the frequency to send messages with synchronism
information and timestamp. It is possible to configure the unit to send 16 messages per second until
one message every-32-seconds.

The field Announce receipt timeout allows choosing the waiting time of Announce message receipt
when RT430 is being used as slave. In case an Announce message is not received within this time
interval, the unit assumes that the current master clock is unavailable and executes the BMC to
select another master clock. It is possible to configure values between 0 and 255.
4.5.8

Sending configuration

The <A > button allows transmitting the changes made to the unit.
PPLY
By clicking <Apply> a window will open requiring configuration username and password. Enter username
and password and click <L
64
>. To cancel de action, click <C
OGIN
>. During the transmission, the unit will
ANCEL
RT430-TM-EN-5