We have 2 GSM modems connected to 2 serial ports of our win 2000 servers.
These modems are working fine for the past 2 yrs. Recently, we would like to add another 2 modems, but since there is no more serial port available, we use serial to usb cable to connect the modem to usb port.
(they become com 3 and com 4)
However, this config is not stable, as one of the new modems will be disconnected after a few hours, sometimes a few days.
The strange thing is only com3 or com 4 will get disconnected, and it’s quite random, sometimes com3 the other time com 4.
Is there any issue with the serial to usb cable converter?