Question : setting up port monitoring on a Dell PowerConnect switch

I have a Dell PowerConnect 3448P switch, and I would like to set up Port Monitoring on it.  I tried following the instructions in the user guide - I selected a destination port, and then added several source ports.  However, the "status" of each of the source ports continues to show as "notReady".  What am I missing?  (I don't have any experience with this, so it's quite possible I'm missing something obvious.)  Any help would be appreciated.

Answer : setting up port monitoring on a Dell PowerConnect switch

The Dell web documentation mentions the ports all have to be in the same VLAN and there is a note about source and destination ports being in the same range of ports like 1-24 or 25-48. I don't know if those restrictions still apply.