Negotiated incoming/outgoing speeds synchronize, however, so even if one side is capable of high-speed transmissions, the connection will be limited to the slower rate. This affects only the max transmission speed, because the VSX 3000 modulates its bit rate and codec based on connection quality. Even if a connection is negotiated at 1,920 Kbps, the system will react to packet loss and lower the video quality, then reduce the audio quality. If more sophisticated compression is needed to take advantage of available bandwidth, the system can change encoders on the fly.
The new H.264 codec, used at rates of up to 768 Kbps, gave better "talking head" video than H.263. Also known as MPEG 4 Part 10 and AVC, H.264 offered performance on par with any encoder, but did a much better job of masking compression. This, in turn, let it transparently discard unimportant background detail.
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