Yes, you can daisy-chain the BNC from the Mytek to the Saffire and on to the Octopre.
It's only a small point, and I think you will be very happy with the audio quality you get from a Focusrite ISA feeding a Mytek however it's connected at the back end. The point about the optical connection is not that noise could affect the digital signal transfer, but that it stops computer/interface ground noise getting from the computer into the analog front ends and hence affecting the signal before it is digitised.
A reasonably pure sinewave is what is usually employed in this type of test with a power spectral analysis display. The test is not completely straightforward, since you have to look at what the baseline is doing underneath a large signal rather than with no signal. Once you have got it set up and working, it might be worth doing a quick test (at 44.1/48KHz) with copper and then with optical S/PDIF connection to see if there is any difference in the baseline noise. A clock regenerated from an incoming ADAT or S/PDIF stream is perfectly sufficient to keep the digital data flow in lock, but you can usually do better if you need it for accurately timed (low-jitter) conversion sampling. Your example is a good one in that it illustrates the difference between a clock supplied for data locking purposes (first case) and a clock supplied for conversion and locking (second case). Use a second 75 Ohm BNC cable and T-piece to extend the daisy-chain. If you need to use some of the analog inputs of the Saffire 56 as well, you should consider routing the Mytek wordclock to both the Octopre and the Saffire so that it gets the best-quality clock. By doing this you would reduce the chance of ground current noise getting into the audio. Note that instead of copper cable via an RCA connector, you could use an optical cable between the Mytek and the Saffire, with optical input 2 switched to S/PDIF. For outputs, itll have RCA and XLR capability. These cables work at 75 and it is important to choose quality cables to avoid jitter and signal degradation, especially when used with AD or DA converters. Giesemann Clock 10M Reference Master Clock - Edition X26PRO will have USB, Optical, Coaxial, bluetooth, AES and IIS inputs. 3 foot LV-61S Canare Cable with BCP-C4B BNC Canare Connectors. A Real-World Example Let’s suppose that you purchased a digital system processor and you plan to connect it to your digital mixing console. They are also used for video signals (SDI). Homepage Digiflex BNC & Wordclock Cables. The BNC connectors you see labeled word clock carry you guessed it word clock, but nothing else (see Fig. They are also used for video signals (SDI). Use 75 Ohm BNC cable, T-piece and terminator. A BNC cable is normally used for word clock or digital signals in the recording studio. However, this pre-supposes that the S/PDIF and ADAT data are themselves synchronised together, so it's a good plan to take the BNC wordclock out of the Mytek ADC and feed it into the external wordclock input of the Octopre. If you are just using the Saffire 56 for transferring the S/PDIF and ADAT data streams to your computer, it does not need external sync - you lock the Saffire to either of the incoming digital inputs.
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