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# Frequently Asked Questions
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about the White Rabbit
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switch.
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# Frequently Asked Questions
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about the White Rabbit switch.
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## Connecting the switch to an external GPS receiver
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... | ... | @@ -34,12 +32,19 @@ we mean the messages generated by the LM32 CPU inside the Virtex FPGA. |
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They may provide useful information for debugging the timing subsystem.
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They can be viewed by connecting a serial terminal to the the front left
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USB port (up to v. 3.2 switches) or the "FPGA test" USB port in the rear
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(newer switches). RS232 parameters are 115200, 8N1.
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(newer switches). RS232 parameters are 115200,
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8N1.
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-----
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## General questions
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### Q: Should green and orange LEDs be lit when copper SFP is used even without Ethernet cable plugged in ?
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A: Yes, that is the normal behavior with most of the copper SFPs. Even
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after unplugging Ethernet cable the copper SFP fakes an active
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connection so green LED is ON and orange may be blinking.
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### Q: does the switch comply to CE regulations (EMC)?
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A: It is. The company Seven Solutions has performed extensive EMC tests
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... | ... | @@ -48,15 +53,9 @@ switch. |
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-----
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### Q: If I don’t participate in WR workshop meetings, is the presentation material still available?
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## White Rabbit general questions
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A: All we do is public. All [information from the workshops](/Workshops)
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is
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public.
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-----
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### Q: How can I test White Rabbit equipment? Or I can I buy some test equipments from your company?
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### Q: How can I test White Rabbit switch equipment? Or I can I buy some test equipments from your company?
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A: CERN is not a company, but a publicly funded intergovernemental
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organization. We develop the technology but don't produce the equipment,
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... | ... | @@ -70,17 +69,14 @@ the companies from which you can buy a WR switch (Commercial producers, |
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at the bottom). On the [wiki page about SPEC
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card](https://www.ohwr.org/project/spec/wiki) (an example of WR Node)
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you will find companies producing SPEC cards.
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For starting to play with WR technology, very soon a "WR started kit"
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will be available, see [WR node wiki page](/Node) for
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details.
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For starting to play with WR technology, a [WR starting
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kit](https://www.ohwr.org/project/wr-starting-kit/wiki) is
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available.
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-----
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### Q: Should green and orange LEDs be lit when copper SFP is used even without Ethernet cable plugged in ?
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### Q: If I don’t participate in WR workshop meetings, is the presentation material still available?
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A: Yes, that is the normal behavior with most of the copper SFPs. Even
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after unplugging Ethernet cable the copper SFP fakes an active
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connection so green LED is ON and orange may be blinking.
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A: All we do is public. All [information from the workshops](/Workshops)
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is public.
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-----
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... | ... | |