Venice S4 supports 4 channels. 4 RS422 ports, 4 HD-BNC in ports and 4 HD-BNC out ports.
Venice S8 supports 8 channels. 8 RS422 ports, 8 HD-BNC in ports and 8 HD-BNC out ports.
In some situations, the channels might be swapped between the two card set.
Refer to the User's Manual for additional detail descriptions: