That depends upon the AVN encoder. See the complete AVN Comparison Chart here.
The AVN420 and VSiCaster™ have total bandwidth between 100 kbps and 4 Mbps, which makes them well suited for stream transmissions over the public Internet or any LAN.
AVN4XXHD encoder blades (AVN422, AVN441, AVN443) have a configurable total bandwidth between 5 and 20 Mbps.
The AVN2XX encoders (AVN200, AVN210 and AVN220) have different bitrate/bandwidths dependent upon type. See the link at the top for a complete AVN comparison chart.
Once a specific bitrate is set, a sustained bandwidth of the same value is required to pass clean video (i.e. Bitrate = 3.8Mbps requires at least a sustained 3.8Mb pipeline).