A backplane (1) comprising —a first module connector (2d) configured to receive a first printed circuit board module (5d) and including a first connector portion (23d-26d); —a second module connector (2e) configured to receive a second printed circuit board module (5e) and including a second connector portion (23e-26e), the first connector portion (23d-26d) being connected to the second connector portion (23e-26e) through a backplane bus.