A two-way satellite time and frequency transfer (TW-STFT) network in the Pa
cific Rim region is under construction to contribute to the calculation of
the international atomic time (TAI), Four major time and frequency institut
es in this region have been conducting long-term TWSTFT experiments, In add
ition to these institutes, several others in the region are planning to joi
n the network. A new type of time transfer modem for TWSTFT is also describ
ed.