Breakout cables and port number

[jeronimo]

Maybe it's a stupid question, but for example with a 1x40G -> 4x10G copper breakout cable, how do you tell from the four SFP+ ends of the cable which will become port 1/x/1, 1/x/2, 1/x/3 and 1/x/4, respectively? I mean without trying. I could not find any markings on the connector itself.

[Ludovico_Steven]

Pigtails are numbered usually.

[jeronimo]

They seem to be "lettered" in this case. B=1,C=2,D=3,E=4 ? 🙄

But i've only tried one, I'll try a few more 😁