The mixer for the Internet LineJACK is an analog mixer with volume adjusted in simple stages. This is independent of any DSP audio scaling settings (as found in the Internet PhoneJACK). The hardware block diagram is reproduced here as a guide:
Primary control of the Internet LineJACK is through the ISA bus. The Plug and Play (PnP) controller handles the Plug and Play functions automatically. The audio mixer is a flexible, feature rich device capable of multiple audio routing functions. The SLIC and DAA handle the local electrical and logical interfaces as well as controlling the state of the ports. The SLIC handles the POTS port interface and is concerned with local telephone equipment. The DAA (Data Access Arrangement) is used for interfacing to a local telephone company Central Office. The DSP is capable of full duplex audio compression and decompression and can use downloadable software compression algorithms for future expansion. The DSP also handles the encoding and decoding of the compressed audio in several industry standard formats, including G.711, G.723.1, and G.729A
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