ipw3945-ucode provides a file which needs to be present on a system before installing ipw3945.
The file ipw3945.ucode provided in this package is required to be present on your system in order for the Intel PRO/Wireless 3945ABG Network Connection Adapater driver for Linux (ipw3945) to be able to operate on your system.
On adapter initialization, and at varying times during the uptime of the adapter, the microcode is loaded into the RAM on the network adapter.
The microcode provides the low level MAC features including radio control and high precision timing events (backoff, transmit, etc.) while also providing varying levels of packet filtering which can be used to keep the host from having to handle packets that are not of interest given the current operating mode of the device.
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