White Rabbit Switch - WRS
7.4 GrandMaster mode
Figure 7: White Rabbit Network
In a White Rabbit network, almost all the switches are configured as master (a.k.a Sim-
pleMaster) (default configuration). They transmit the clock signal that cames from other
switches. However the “top” switch connected to the GPS signal is called the GrandMaster
and is configured in a specific way.
First you need to connect the 10MHz and PPS from a clock source to the switch SMC
inputs.
Please consult the wr external reference.pdf document to understand what kind and shape
of signals is needed as input for grand master mode.
Then to configure a WRS as GrandMaster you must:
1. Using the WMI
You can find the option to select the switch in grandmaster mode in the configuration
panel under the WR-PPSi tab. Once you have change the option, you should click on
Save new configuration, and wait until the WRS has reboot.
Note: A NTP server should be provided for the grandmaster switch so that we can
distribute the current TAI seconds to the whole WR network.
Creotech Instruments S.A. tel. +48 22 233 10 27
ul. Gen. L. Okulickiego 7/9 e-mail: support@creotech.pl
05-500 Piaseczno, Poland www.creotech.pl
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