This read-write DisplayString sets or reads the IP address of the NTP server the PDU uses to synchronize its clock, per the object's own description. An admin typically prefers configuring this over timeRfcTimeServer since NTP is the more widely supported and more precise time-sync protocol, keeping the PDU's clock aligned with the rest of the network. For example, an admin sets timeNtpTimeServer to the same internal NTP pool address used by other network gear, so a power event logged by the PDU can be time-correlated precisely with switch and server logs.