This was cool... wanted to share.
If you are planning to do Multisite among multiple SBCS sites then each UC520 needs a unique data VLAN.
If you are integrating SBCS into an existing private data Network, then you will need to adjust the data VLAN.
In either case, this is something that you would do as soon as you unpack the unit, before it is configured (or after it is factory reset).You would have planned the network in advance and this is just how you configure the Data VLAN.
I tried it on CCA 1.9.1, it worked, so I copied down what it looked like.Hope it helps you as well.