The index for the module or submodule described in this row. The top-level module's oid is always 1.1. Submodules nest within the top-level module (e.g. 1.1.1, 1.1.2,...) and may have submodules nested within them to an arbitrary level(e.g. 1.1.1.1, 1.1.1.2,...).

Each hardware component which has a product code that can be read or inferred by the SNMP agent may appear as a row in this table. The nesting of modules within modules describes the hierarchy of the hardware components that make up the top-level module.