J. Kissel, O. Patane

In support of last week's CER / Electronics / Rack changes to move the Beam Splitter electronics over from the susb123 / SUS-C5 & C6 system to become a part of the expanded susb2h34 / SUS-C1 & C2 system (LHO:88765) we were re-mapping the beam splitters Binary IO Card system from the former susb123 to the new susb2h34 system.

In the susb123 system, the Beam Splitter shared it's BIO system with the ITMs' TST/L3 stage ESD Drivers. That meant that we couldn't migrate the electronics and cards to susb2h34 like the other parts of the beam splitter control system. So, a new BI and BO chassis were installed in SUS-C1, and a new BIO card was installed into the susb2h34 IO chassis. The 2x PCB100WS (HDRA100 to 2xD37 pigtail) cables that connect to/from the BIO card from/to the BI and BO chassis were also new.

However, the SUS wiring diagrams have never really depicted these BIO cables well, and thus didn't establish a cable naming convention. Worse, even though the PCB100WS pigtail cables connect into different places with different orientations w.r.t. the BIO card (which has two HDRA100 100-pin outputs), the cables themselves are identical. Further, the BIO card ends are in one rack (with the IO chassis) and the BI / BO chassis ends are in an (adjacent, but) different rack. These facts makes it really tough to follow or connect new additions if the existing system is poorly labeled and there's no written-down convention established.

Thankfully, there were hints of a convention on a few cables of the susb123 system, namely 
    SUS_${BI/BO_DestinationRack}_${BI/BO_DestinationUHieght}_${OUT/IN}
BUT -- 
    (1) The labels that were there only labeled one of the two pigtails so which was "CNA" connecting to the Lower 32 Bit BO/BI chassis input and which was"CNB" connecting to the Upper 32 Bits was very unclear, and 
    (2) at some point in their history the BI/BO destination u-heights for the BIO0 and BIO2 cards were flip-flopped.

So, I improved the convention to include the _CNA and _CNB, such that the cable naming convention is now 
    SUS_${BI/BO_DestinationRack}_${BI/BO_DestinationUHieght}_${OUT/IN}_${CNA/CNB}
and drew it up in an Altium-like set of google slides -- see attached "after" BIO diagrams that represent the susb13 and susb2h34 systems now after the 2026-01-13 rack work.

Oli's going to work on adding this convention to all the actual Altium wiring diagrams, D2300401 for susb13 and D2300383 fr susb2h34.

In in the mean time, I spent some quality time with a label maker and re-labeled all the susb13 cables and labeled all the susb2h34 cables. Note -- for the susb13 system, I didn't move any cables, but since I had to relabel the cables anyways to add the CNA/CNB extension, I just relabeled all the cables. As such, the unchanged susb13's BIO cables now match convention again, where the BO/BI chassis destination U-height is correctly assigned to the cable name.

Pictures attached:
susb13:
    SUS-C5_BIOCables_Labeled.jpg # IO Chassis End in SUS-C5
    SUS-C6_BIOCables_Labeled.jpg # BO/BI Chassis End in SUS-C6

susb2h34:
    SUS-C2_BIOCables_Labeled.jpg # IO Chassis End in SUS-C2
    SUS-C1_BIOCables_Labeled.jpg # BO/BI Chassis End in SUS-C1