What are the restrictions on audio channels per bundle?
0 to 8 audio channels may be stuffed into a bundle. Since each bundle represents an Ethernet packet transmitted once per isochronous cycle, the total amount of data transmitted per isochronous cycle cannot exceed the 1500 byte Ethernet payload limit. You can make a rough determination as to whether you are exceeding this limit by adding up the number of bits you’re trying to send in each bundle. 8 audio channels/bundle x 64 samples/isochronous cycle x 20 bits/sample = 10,240 bits = 1280 bytes. When you go to 24 bits/sample you get 12,288 bits or 1536 bytes which is in violation of the 1500 byte limit.
