A terminal block fastens conductors by placing the conductors one above another and fastening bolts and includes a plurality of nuts on which the conductors are to be placed and partition walls partitioning between adjacent nuts. The present techniques locate the postive feature and negative features according to a single mask step. Similarly, the receiver has a multi-carrier demodulator, a receiver demultiplexer stage, a first decoding stage, a receiver multiplexer stage and a second decoding stage, whereby the receiver-multiplexer stage and demultiplexer stage are in turn controlled by the bit loading device.