PURPOSE: To provide an internal processing circuit corresponding to a terminal equipment of NRZ or RZ form.
CONSTITUTION: When a terminal equipment sending/receiving a signal of an NRZ form is connected to an RZ, NRZ common use internal processing circuit 10, a changeover circuit 14 inputs a signal of an NRZ form received from a terminal Ti to an internal processing circuit 11 as it is and a signal outputted from the internal processing circuit 11 is outputted to the terminal equipment from a terminal To as it is. On the other hand, when a terminal equipment sending/receiving a signal of an RZ form is connected to the RZ, NRZ common use internal processing circuit 10, a signal subject to RZ-NRZ conversion by a 1st signal converter 12 is inputted to the internal processing circuit 11 and a signal of an NRZ form outputted from the internal processing circuit 11 is inputted to a 2nd signal converter 13, in which the signal is subject to NRZ-RZ conversion and the resulting signal is outputted from the terminal To.
HASHIDO SHIGEYUKI
FUJITSU NAGOYA TSUSHIN SYST KK
FUJITSU ACS KK
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