  An extended version of the CALICE silicon-tungsten ECAL was tested in
November 2021 at the DESY beam test facility. With 15 active layers, it
featured some with a thin PCB design, and a new compact DAQ system handling all
layers in a common set. The noise, self-trigger performances and response to
punch-though electrons, without tungsten absorbers, have been evaluated for
each of the 15360 channels, using an improved procedure. Showers of low-energy
electrons (1 to 6 GeV) have been recorded in two configurations of absorber,
and are being analysed. Some preliminary results at the cell level will be
presented.
