There are five physical console interfaces RJ45 (rollover and straight through), DB9, USB type A, and USB type B:
Switches that use RJ45 rollover (RJ45 to DB9 Dell, Part# C206M): PowerConnect 5500, 7000, 8000, 8100, N100, N1500, N2000, N3000, N4000, Force10 E-Series (ExaScale and TeraScale), C-Series, Z-Series, S55, S60, S4810
Switches that use RJ45 straight-through (Not Dell specific): Force10 S25, S50
Switches that use DB9 (Null modem cable, Dell Part# PD378): PowerConnect 2800, 3500, 6200
Switches that use USB type A (DB9 to USB type A, Dell Part# WY835): PowerConnect m6220, m6348, m8024, m8024-k
Switches that use USB type B (Not Dell Specific): Force10 E-Series (ExaScale), Z-Series, S55, S60, S4810