Multichannel uplinks can be achieved by using either Dual path, (two carrier signals) or a multiplex, (data for individual channels sent on one carrier) Solo also have a Statistical mulitiplex system capable of delivering six channels in a very much reduced bandwidth.
Solo will always recommend an additional encoder for any multi channel transmission to reatain redundancy

A common misconception is that multiplex transmissions are not redundant, At Solo this is not the case. As all our multiplex transmissions are done with a redundant multiplexer.