An online V-SDC or a semi-connected E-SDC transmits the sales data to the TA immediately. The E-SDC sends flexible data packets, reducing transmission bottlenecks.
If the Internet service is weak or intermittent, an E-SDC transmits the data the moment the internet connection is restored. If there is no Internet at the point of sale at all, the data can be saved to a USB flash drive, and taken to any other internet-connected device for transmission (e.g. at the local Internet café), or delivered physically to the TA.
No activity (regular transmission of valid audits packages), for active location will raise a red flag and provoke on-site audit by TA.