Dell POWEREDGE M1000E - Manual (Page 109)

Using the Command-Line Interface 109
Unit, Slot, and Port Numbers
The unit, slot, and port numbers are separated by forward slashes and follow
the port type. For switches that do not support stacking (PCM8024 and
PCM8024-k), the unit number is always 1. For stackable switches (PCM6220
and PCM6348), the unit number can be 1–12.
All internal and external integrated ports are in slot 0. For the PCM6220 and
PCM8024 switches, the slot number can also be 1 or 2 if optional modules are
installed. For the PCM8024-k, the slot number can be 0 or 1. The PCM6348
does have an expansion slot, so the slot number is always 0.