The interconnections on the M1000e chassis are fixed/dependent upon which modules are installed into which slots. There is a great blog here that outlines a lot of this information for you.
www.cosonok.com/.../dell-m1000e-blade-enclosure-logical_22.html
Here are some further articles that go into it.
www.dell.com/.../ps1q08-20070500-Loffink.pdf
www.dell.com/.../m1000e_blades_architecture_white_paper_en.pdf
www.dell.com/.../server-poweredge-m1000e-tech-guidebook.pdf
Hope this info helps, let us know if you have any further questions.
Thanks