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## Inter-operability
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### Q: Is the WR Switch inter-operable with standard PTP (IEEE1588-2008) gear ?
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### Q: Is the WR Switch inter-operable with standard PTP (IEEE1588-2008) gear?
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A: Yes, although you would completely lose the sub-ns timing resolution
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of White Rabbit, a WR switch is interoperable with PTP and it has been
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3\. plug &
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play
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### Q: Can I connect a standard non-WR GbE NIC or Switch/router to the WR Switch ?
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### Q: Can I connect a standard non-WR GbE NIC or Switch/router to the WR Switch?
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A: Yes. You can use a WR-network for standard datatransfer, using
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standard Ethernet hardware. It works fine since a WR switch is a
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... | ... | @@ -121,7 +121,7 @@ switches](/Switch#commercial-producer). |
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## Switch management
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### Q: Can the WR Switch get its IP address on the Management Ethernet port from DHCP server ?
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### Q: Can the WR Switch get its IP address on the Management Ethernet port from DHCP server?
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A: Yes, the WR Switch has a DHCP client software. Please remember
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though, if you modify the startup scripts to assign a static IP address,
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[Gnudd](https://www.ohwr.org/companies/gnudd), Maciej Lipinski,
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[CERN](http://cern.ch??)
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### Q: Why on older switches (software versions up to [v3.1](https://www.ohwr.org/news/29)) it was possible to access (e.g.: ssh) WR switch through any port (wr0-wr17 and management) and in the newer software releases (from software version [v3.3](https://www.ohwr.org/news/32)) it is not ?
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### Q: Why on older switches (software versions up to [v3.1](https://www.ohwr.org/news/29)) it was possible to access (e.g.: ssh) WR switch through any port (wr0-wr17 and management) and in the newer software releases (from software version [v3.3](https://www.ohwr.org/news/32)) it is not?
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A: Accessing the WR switch for management (e.g. ssh) through a "normal"
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port (e.g. wr17) instead of through the copper Ethernet management port
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??Author: Benoit Rat, [Seven
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Solutions](www.sevensols.com??)
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### Q: Why after updating the firmware to v4.x my changes in /etc/\* files are not visible after a reboot ?
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### Q: Why after updating the firmware to v4.x my changes in /etc/\* files are not visible after a reboot?
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A: Since v4.0 we unpack the root filesystem from initramfs and the
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*/etc* directory is copied at boot time from the */usr/etc*. If you want
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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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### 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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??Author: Erik van der Bij,
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[CERN](http://cern.ch??)
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### Q: How fast is the overall performance within the WR switch fpga? Is it really 18\*1Gbps? As an example: When I establish a connection between port1 and port2 with 1 Gb/s is it possible for port3 also to communicate with port4 with 1Gb/s ? Is it still possible for each connection to communicate at full speed?
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### Q: How fast is the overall performance within the WR switch fpga? Is it really 18\*1Gbps? As an example: When I establish a connection between port1 and port2 with 1 Gb/s is it possible for port3 also to communicate with port4 with 1Gb/s? Is it still possible for each connection to communicate at full speed?
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A: A good question. It should be and it is meant to be but it's not yet
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possible. The current gateware have the following issues:
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... | ... | @@ -375,7 +375,7 @@ wr-switch-hdl project regarding this problem. |
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??Author: Maciej Lipinski,
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[CERN](http://cern.ch??)
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### Q: Which FPGA is used inside the WR Switch, Virtex 6 LX130T or LX240T ?
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### Q: Which FPGA is used inside the WR Switch, Virtex 6 LX130T or LX240T?
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A: Initially WR Switch v3.3 was designed with LX130T FPGA. That is why
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you can still find it in the schematic and PCB layout files. However,
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