  We present the design and performance of the On-Board electronics for the
Drift Tubes (OBDT) for the superlayer theta along the direction parallel to the
beam-line, the new board built to substitute part of the CMS DT Muon
on-detector electronics. The OBDT-theta is responsible for the time
digitization of the DT chamber signals for the theta view, allowing further
tracking and triggering of the barrel muons. It is also in charge of part of
the slow-control of the DT chamber inner electronics in the theta view.
Prototypes of the OBDT-theta board are under validation in different
laboratories in CERN, as well as in demonstrator chambers installed in the CMS
experiment. This allows evaluation of the full functionality of the boards in
real conditions, showing very satisfactory results.
