Question:  I have (5) Tempest 2400 systems in use, they are all connected together via ethernet switch to a PC running TDesk version 1.501, all the bases have different IP addresses but I'm getting the message "Network Problem" on the base station Navigation Pane label names, two of the bases have a red dot while the other three show a green dot.  Am I missing something in my ethernet IP setup?
Answer: 
The issue isn't with the IP addressing on the base stations or the PC setup.  The "Network Problem" message is actually referring to the RF hopping pattern setup on the base stations.  When multiple base stations are used together they should be Accu-Synced together using the rear panel Sync In and Sync Out DB-9 connectors, in addition to this hardware connection the user has to set up the Network Number and Lockout Key in the Tech Menu / Radio Configuration Menu on each base station. 
When multiple base stations are linked together if the Network number separation isn't 4 or greater than TDesk will report this as a problem.  So if your basestations have Network numbers 31, 35, 39, 42 and 46The base stations with Network numbers 39 and 42 will report in with the Network Problem message.  Simply change the bases Network numbers from 42 to 43 and 46 to 47 to correct the problem.  This will insure that all base station RF carriers will be in proper hopping sync and not collide with each other.  See picture below showing base 4 and base 5 with RED status dots indicating Network Problem.
The network number in Tempest is an RF setting that determines what hopping pattern will be used for that particular system. It is important to note that the network number has nothing to do with the wired LAN connection. There are 64 total network numbers or hopping patterns available for use. Network numbers are numbered 0 – 63. Each hopping pattern has 43 frequencies available for Tempest to use. All 64 hopping patterns use the same 43 frequencies.  When operating multiple Tempest systems in the same location it is best to separate the network numbers of each system by at least four numbers. For example you might use a network number of 1 on the first system, 5 on the second, 9 on the third, 13 on the fourth and so on for as many systems as you have. You may start with any network number and move from there. 2, 6, 10, 14 is as good as 7, 11, 15, 19, just as long as you have a separation of four numbers between each system. Changing this setting is very easy and it can help to avoid unwanted interaction with other Tempest systems that may also be operating on the default selection.