Intended combinations seem to be Commlink+SIM Module+Trodes/Datajack (anyone), Cyberdeck+Cyberjack (deckers) or RCC+Control Rig (riggers).
But there are many more combinations that seem to be valid (basically everything except cyberdeck and RCC at the same time).
Commlink (no DNI, no SIM)
Commlink+Trodes/Datajack (no SIM)
Commlink+SIM module+Trodes/DatajackCommlink+Cyberjack (no SIM)
Commlink+SIM module+Cyberjack
Commlink+Control Rig
Commlink+Cyberjack+Control Rig
Cyberdeck+Commlink (no DNI)
Cyberdeck+Commlink+Trodes/Datajack Cyberdeck+Commlink+Control Rig
Cyberdeck+CyberjackCyberdeck+Cyberjack+Control Rig
RCC (no DNI, no SIM)
RCC+Trodes/Datajack (no SIM)
RCC+Commlink+SIM module+Trodes/DatajackRCC+Cyberjack (no SIM)
RCC+Commlink+SIM module+Cyberjack
RCC+Control RigRCC+Control Rig+Cyberjack
Trodes or Datajack = DNI (which is needed for VR together with SIM module)
Cyberjack = DNI, matrix edge actions, extra VR actions and good defense
Control rig = DNI, SIM module and jump in
Cyberdeck = SIM module and hacking
RCC = sharing, noise reduction and good defense
I would assume that the point of a Cyberjack is to provide the DP/FW for Cyberdecks.
It also enable matrix edge actions and extra actions while in VR mode (also if you are not using a cyberdeck)
I can still run a Cyberdeck through a commlink.
Yes, but without a cyberjack you will end up with pretty crappy DR and no extra actions in VR mode.
And from what I gather, a Cyberdeck could, potentially, have it's own radio (wireless connection).
If you want to access the matrix it seem as if you need to combine it with either a cyberjack or a commlink.
could one run a Cyberjack through a commlink?
You can have both a commlink and a cyberdeck in the same network, yes.
And if so, which DP/FW would you use?
You can rotate all attributes through your persona, even if they originated from different devices.
I assume it's the lowest of the two: Almost always a commlink.
Your network will most likely be protected by the firewall of your cyberjack (you typically pick the stronger of the two)
A common decker tactic in SR5 is attacking someone Cyberlimbs via entering their commlink and shutting down anything with the wireless on.
In SR5 you interacted directly with wireless devices no matter if they were slaved to a master device or not.
You didn't have to first gain access on the commlink and then gain access on his device, you just hack the device directly.
Having said that, augmentations (including cyberlimbs) were connected to their host via neural link.
Wireless was not needed unless there was a wireless bonus you wanted to utilize.
(and if they are not wireless enabled then they were immune to hacking)
Would the decker hit the commlink, then have to hit the Cyberjack to attempt to get to the Cyberlimbs?
In SR6 you don't hack individual devices one by one. You hack the entire network at once.
The network will use the higher firewall of the commlink and the cyberjack.
Once you have access on the network you also have access on all devices and augmentations that is part of the network.
the Cyberjack itself doesn't seem to have a signal rating
Signal rating?
....that you'd likely run a cable from the 'Jack to the Commlink. And could this potentially have benefits for, say, a Street Sam looking to protect his Cyberlimbs by hiding them behind the 'Jack?
Doesn't matter if devices in a network are connected via a wire or if they are connected wireless. Once a hacker gain access on your network (either via brute force or by probing for a backdoor) he will gain access on the entire network and all its devices. A network is a network is a network.