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40m Log |
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Message ID: 14901
Entry time: Thu Sep 19 21:23:51 2019
In reply to: 14895
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Author: |
gautam |
Type: |
Update |
Category: |
CDS |
Subject: |
Fast BIO splicing re-implemented at 1Y2 |
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[KA, GV]
Summary:
- New cross connect system for splicing the fast BIO signals for whitening switching to the P2 connectors was installed and tested at 1Y2.
- It passed a first round of tests. 😁
- As of now, I believe all the necessary electrical connections have been made at 1Y2/1Y3, and we are ready for testing the c1iscaux system.
Details:
- We did some testing in the office area, and found several wiring mistakes. These were all rectified. Attachment #1 is an accurate reflection of the implemented wiring scheme (softcopy in the 40m google sheets area). Be aware that the IDC 50 pin connector pin-out is tricky, and you have to be aware of the difference between male/female connector when looking for this pin-out on the internet.
- In order to facilitate further testing, we re-routed the ADC0 SCSI cable that was unplugged on the overhead cable tray, and plugged it back into the c1lsc expansion chassis. This action necessitated a reboot of the vertex FEs, but everything came back alright.
- Did some general neatenign and strain relieving. Removed a few existing cross-connects to make space for our new terminal blocks.
- Attachment #2 shows the layout of the terminal blocks. Note the unusual (vertical) order of the orange terminal blocks.
- The final integrated CDS test done was the following:
- Set whitening gain for channel under test to 45dB, so that the dark noise level is boosted to a measurable level such that a change can be seen with the whitening enabled/disabled.
- Compare the ASD of the signal between 30-100 Hz with the whitening engaged/disengaged.
- Example result shown in Attachment #3.I believe the whitening is 15:150 (z:p)
Tomorrow:
- Recover POX/POY locking,.
- ...
Quote: |
Update 2019 Sep 19 1730: The pin numbers of the IDC 50 connector are all off by 1. i.e. 3-->4 and so on. I will fix this shortly. The problem was because of me looking at the pinout for the wrong gender of IDC50 connectors.
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