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# Frequently Asked Questions
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## Usage of the switch
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## Connecting the switch to an external GPS receiver
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### Q: What are the advantages of using external GPS signals or are there any disadvantages of not using them and leave the connectors open?
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A: You mainly get two things:
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- A more stable oscillator for the master switch and therefore for all
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the network.
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- A GPS/UTC/TAI-related time scale. This is important if you want to
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relate your events to official time or if you want to avoid
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re-starting your time scale at 1 Jan 1970 (or something like that)
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every time you reboot the switch. Two events seen in a WR network at
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very different times could have very similar time stamps in there
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was a switch reboot in between. Syncing to GPS time on reboot avoids
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that.
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### Q: When connecting the GPS-PPS or the 10 MHz GPS clock to the WhiteRabbit Switch, do I have to change/configure anything?
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... | ... | @@ -30,7 +44,7 @@ tests. |
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-----
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Tom Wlostowski, Erik van der Bij - 8 October 2012
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8 October 2012
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