What am I missing upgrading the backplane on SM CSE-216

[SRussell]

I am looking at two different backplanes to upgrade my SuperMicro CSE-216 currently running SAS2. The two units are:
BPN-SAS3-216A-N4
BPN-SAS3-216EL1-N4

I have read through both manuals but do not understand why they differ except the EL1 backplane can have a daughter card for multi-pathing.

Couple of questions:
1. Can I use either backplane to give me 20x SAS3 and 4x NVMe?
2. I will need a Supermicro AOC-SLG3-4E4T HBA but I am unable to figure out which Oculink cables are needed. I reviewed the documentation for the backplane, HBA, this server 216BE1C4-R1K23LPB and could not find a catalogue number for the cables.: Can ignore this just realized there was an option to expand the parts list.
3. To have all ports functional; is it correct to assume I will need the AOC-SLG3-4E4T and a SAS3 HBA (LSI SAS3008)?


https://www.supermicro.com/manuals/other/BPN-SAS3-216A-N4.pdf
https://www.supermicro.com/manuals/other/BPN-SAS3-216EL1-N4.pdf
https://www.supermicro.com/manuals/other/BPN-SAS3-216EL1-N4.pdf
SC216BE1C4-R1K23LPB | 2U | Chassis | Products | Super Micro Computer, Inc.

 

[i386]

216a has a "passive" Backplane, 6x multilane sas Ports
216el1 has an Expander Backplane, 4x multilane sas Ports (2 Ports Go to the hba/Controller and 2 Ports can be Used for cascading backplanes)
1: yes
3: no, you will need 3 (8port) hbas for the 216a

Writing this in the Phone sucks ._.

 

[Rand__]

Technically he will need 3 x 8port only on the -A, on the EL1 a single 8port card will suffice (at reduced total bandwith o/c)

Edit: Or better 3x 2 port since each port carries 4 SAS lanes so we can cover 3 x 2 x 4 =24 SAS lanes for 20/24 SAS drives