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doc [2022/11/07 11:47] – [Octoclocks] lcardoso | doc [2023/11/27 11:58] (current) – [Node position map] lcardoso | ||
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===== Node position map ===== | ===== Node position map ===== | ||
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- | {{:node_positions.png?700|}} | + | |
(Click on the image for a higher resolution picture) | (Click on the image for a higher resolution picture) | ||
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# Octoclocks | # Octoclocks | ||
- | A hierarchy of octoclocks allow the reference and timing distribution to all USRPs in CorteXlab. All cables are of same length (5m between master and slave octoclocks and 10m between slave octoclocks and USRPs). The connection layout is as shown below. | + | A hierarchy of octoclocks allow the reference and timing distribution to all USRPs in CorteXlab. All cables are of same length (5m between master and slave octoclocks and 10m between slave octoclocks and USRPs). The connection layout is as shown below. |
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+ | ==== Timing measurements in the CorteXlab room: ==== | ||
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+ | The octoclock produces a PPS signal that has a period of 1s and remains high during 200ms and low 800ms as shown below: | ||
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+ | The PPS signals between the slave octoclocks in the room are mismatched by a maximum of 800ps as shown below (examples): | ||
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+ | Between nodes 28 (connected to octoclock 3) and 31 (connected to octoclock 4) | ||
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+ | Between nodes 31 (connected to octoclock 4) and 14 (connected to octoclock 2) | ||
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+ | Between nodes 14 (connected to octoclock 2) and 10 (connected to octoclock 1) | ||
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+ | Between nodes 10 (connected to octoclock 1) and 27 (connected to octoclock 3) | ||
- | {{:: | + | For more (updated) info on the octoclocks: |
[[https:// | [[https:// |
doc.1667818067.txt.gz · Last modified: 2022/11/07 11:47 by lcardoso