in SR4A
System
System measures the power of the device’s operating system (OS)
software. This includes its stability, multitasking properties, ability to
control hardware, resources, and the general quality of its code. If the
System software ever crashes, the entire device crashes. System limits
the rating of programs running on the device, and sets the limit on most
devices for the number of programs that can be run without a Response
drop. The System program is limited by the base Response rating of the
device it is on: if the base Response rating of the device is lower than the
System rating, then the System rating is set to equal the Response rating.
System also sets the size of the Matrix Condition Monitor of persona
programs running on the device (Cybercombat, p. 236).
Then in the example of peripherals and nodes in Unwired, pg. 204
Sample peripheral nodes
Device | Response | Signal | System | Firewall |
AR Glove | 2 | 2 | 1 | 1 |
Credstick | 2 | 2 | 6 | 6 |
Fridge | 1 | 3 | 2 | 1 |
RFID tag | 1 | 1 | 1 | 1 |
Security Camera | 2 | 3 | 2 | 4 |
Smartgun | 2 | 1 | 3 | 4 |
Examples of Standard nodes
Node | Response | Signal | System | Firewall |
Standard Home Telecom | 3 | 3 | 3 | 3 |
Premium Telecom | 4 | 3 | 4 | 4 |
Business/Retail Terminal | 3 | 3 | 4 | 4 |
Public Terminal | 2 | 1 | 2 | 2 |
Civic/MSP Wireless Access Point | 3 | 6 | 3 | 5 |
I've marked the examples conflicting the rules from the core. I don't care about the fridge, but credstick limited to system 2 and consequently to firewall 2 is a problem.
The simplest solution would be to increase the response and system to the required firewall, but I think that the problem is actually response limiting system rule, which should be removed.
The secondary problem with this example is the low rating of credstick. I've seen technomancers out-of-chargen TMs who could crack through firewall 6 easily, especially that credstick isn't going to have IC and security spiders inside.