  The extension of data acquisition for the BEijing Spectrometer (BESIII)
experiment until at least 2030 has resulted in upgrades to both the accelerator
and the detector. An innovative Cylindrical Gas Electron Multiplier (CGEM) is
under construction to upgrade the inner tracker, which is suffering from aging.
The CGEM Inner Tracker (CGEM -IT) was designed to restore efficiency and
enhance the reconstruction of the secondary vertexes position. Reconstruction
in the magnetic field of 1 T requires an analog readout and an electronic
contribution to the time resolution better than 5 ns. The entire system
consists of about 10,000 electronic channels and must maintain a peak rate of
14 kHz/strip of signal hits for the innermost layer of the CGEM-IT. The CGEM
readout system is based on the innovative TIGER ASIC, which is manufactured
using 110 nm CMOS technology. A special readout chain consisting of GEM Read
Out Cards (GEMROC) was developed for data acquisition. Two of three layers,
equipped with the final electronics, have been operating in Beijing since
January 2020 collecting cosmic ray data in a test facility, remotely controlled
by the Italian group due to the pandemic situation. Since it was not possible
to perform further tests on the cylindrical detector, in July 2021, a test beam
was conducted at CERN with the final electronics configuration on a small
prototype consisting of four triple-GEM planar detectors. In this presentation,
the general status of the project CGEM-IT will be presented, with particular
emphasis on the results of the test beam data collection.
