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Why isn't Daylight Savings Time (DST) working properly when using custom settings and Network Time Protocol (NTP)?


Issue

Daylight savings time is not working properly when using the "custom settings" option and NTP within my Network Management Card. I am located in a region below the equator.


Product Line

  • Network Management Card 1 (NMC1) - AP9617, AP9618, AP9619
Devices with an embedded Network Management Card 1 include (but are not limited to): Metered/Switched Rack PDUs (AP78XX, AP79XX), Rack Automatic Transfer Switches (AP77XX, Environmental Monitoring Units (AP9320, AP9340, NetBotz 200)




Environment
  • All serial numbers
  • Firmware revisions below v3.7.3
  • Geographical location may be below the equator

Cause

APC has identified a firmware issue that effects the Network Management Card 1 product family in certain time zones. While using the custom daylight savings time setting and a NTP server, the time sometimes reverts back to disregard the DST settings 90 seconds after the NTP synchronization.


Resolution


APC has released AOS v3.7.3 (or higher) which addresses this particular issue for Smart UPS/Matrix (sumx), Symmetra Single & Three Phase (sy and sy3p), Rack PDU (rpdu) and Silcon (dp3e) applications when using Network Management Card 1 devices (AP9617/AP9618/AP9619). The latest version can be downloaded from our website , or by searching https://www.apc.com/us/en/ for the latest version, as of the writing of this article is v3.9.3.

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