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How do you connect four serial interfaces modules to this?
Thank you for your inquiry. Despite the image only showing one connection, this device actually has four power connectors, so each device connects individually.
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Is the UPD-AM being replaced with UPD-IEC?
Thank you for your inquiry,

That is correct, the discontinued UPD-AM is being replaced by UPD-IEC.

The UPD-IEC is not out on the market yet; Unfortunately Avocent (by Vertiv) does not yet have a specific date on when it will be available.

Please let us know if there is anything else we can ever help you with!
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