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Modem COM port restrictions?
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January 13, 2016
11:02 am
Robert Covington

Alright, thanks Henk!

January 13, 2016
10:31 am
Henk Helmantel
Forum Posts: 1502
Member Since:
May 28, 2013
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Hello Robert,

The full edition of Diafaan SMS Server does not have an artificial limit on the number of GSM modems you can use. However, there might be a practical limit where adding more GSM Modem Gateways make the system slow or difficult to manage. Using 255 (and far less) individual USB 'dongle' modems will almost certainly be problematic to set up, but if you use a multi-port USB modem pool it might be manageable. Getting a large number of GSM modems in one location to work reliably can be a challenge in itself though, because the wireless modem modules can interfere with another and cause network connection problems.

Windows has a limit of 255 COM port numbers but Diafaan SMS Server can use more GSM modems if they are connected via TCP/IP.

The license for Diafaan SMS Server is valid for installation one one computer, you are not allowed to install one license on multiple computers.

Regards, Henk

January 13, 2016
4:38 am
Robert Covington

I have 3 questions which are all related to each other.

We've been developing our own software on top of Diafaan for about a month now, and it's come to a point where we need to know a bit more about scaling. My assumption has always been that for GSM modems, we will run into a problem once we have more than 256 ports, as that's the maximum amount allowed on any given Windows machine. My first question is that is this actually correct? Will we run into this restriction, and is it really 256? We're using USB modems which make use of the COM ports.

My second question is this: Is there any restriction we'll run into on the Full edition of Diafaan? Can we make 256 gateways, assuming we have all the modems?

My third and final question is: Can we install a single license on multiple machines? If we end up needing more than 256 COM ports, we'll have to put more modems on a separate server, and this server will need a separate copy of Diafaan. Will we need to buy a new license?


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