SFP/USB plug collision

[sbourdeauducq]

[jbqubit]

SMA J1 (FRONT_SMA_CLK_IN) is OK
SMA J2 (SMA_CLK_OUT) collides with SFP J8A

@marmeladapk Consider replacing J2 SMA on prototype hardware with short SMA/SMP connector perpendicular to the PCB.

[sbourdeauducq]

I think the SMA is fine (but double check) this issue is about the USB programming cable that definitely collides with SFP transceivers.

[gkasprow]

we cannot do much here. We can move it under SFP so it blocks only one cage. Or move the USB to the backplane side.

[jbqubit]

Looks to me like that SMA J2 also collides with SFP J8A. No?

[jbqubit]

Would a very slim micro-USB cable fit? https://www.newegg.com/p/181-02AU-000X8

[gkasprow]

Can you measure it with calipers?

[sbourdeauducq]

We can also remove one of the SFPs and replace it with e.g. a SATA connector. What is the use case for having 3?

[sbourdeauducq]

Or move the USB to the backplane side.

No. We do need to be able to reflash and debug Metlino in the crate in an easy manner.

[jbqubit]

Use case for three SFPs on Metlino is same as on Kasli.

Looks like Amazon has even thinner microUSB cables. https://www.amazon.com/Ribbon-Cable-Degree-Standard-Charging/dp/B0784M2X2C