Cisco Video Surveillance Video Encoder cards perform which function?

Video encoder cards act as a bridge between analog camera infrastructure and IP-based video surveillance networks by digitizing and packetizing analog composite video signals into IP streams. This enables organizations to leverage their existing analog camera investments without replacing hardware when migrating to an IP-enabled surveillance architecture. The encoder handles the analog-to-digital conversion and network transmission so that analog sources can be managed by IP video management software.

Video encoder cards do not upscale or enhance video resolution; they preserve and transmit the original analog signal quality as a digital stream.

Encoder cards convert analog signals to digital IP streams, not digital-to-digital; the source is analog, not an existing digital media format.

Video encoder cards do not perform encryption of raw video signals; encryption is handled at the network or application layer, not by the encoder hardware itself.