The maximum number of simultaneous trains that can be controlled by a Power Pro system is 250. If all 250 locos have non-zero speed, the command station will be continually sending speed commands to all 250 moving locos, as required by the DCC standard. But this will not affect the response time of an individual loco to a keypress or speed change since a changed speed command or function command to a particular loco will "jump the queue". Response time will only be affected if many users are making changes to speed or function state simultaneously.
All active NCE cabs are polled in a (not necessarily numerically ordered) sequence and even with the limit of 63 physical cabs and the case of all cabs having a status change to report, this polling loop takes no more than 275ms.
There is no limit to the number of JMRI cabs that can be connected (although the 250 simultaneously active locos limit still applies) and only speed changes or function state changes are transmitted, so response times are unlikely to be a problem.
Your WiFi router will limit the number of WiThrottle devices connected and this limit will depend on the router you purchase.
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Dave in Australia
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On 23 Jun 2017, at 1:44 AM, yooper_from_49827@... [jmriusers] <jmriusers@...> wrote:
Question 1. Does anyone have any experience with what the upper limit of users might be? Occasionally there is a slight delay but I don't know if that is the WiFi, the JMRI interface, or the NCE system causing it. I would like to know where the maximum user limit is before I run into it.
We use mostly NCE ProCabs with radio, nothing tethered. We are now reaching the maximum of 16 ProCabs in use.
