| 摘要 |
PURPOSE:To confirm a circuit connection state at each station side automatically by premitting a curved-line switching control monitoring part to confirm whether its own pattern data coincides with opposite-side pattern data or not. CONSTITUTION:When a request to send signal RS and a carrier detection signal CD are both off, an SW part 60 interchanges a part P and a part Q and once data B1 based on pattern data (PDATA) generated by the PG404 of an equipment side (in circuit interface) to which the system is to be connected is received, a DR turns on. Consequently, the circuit connection, i.e. setup of a data like is recognizable. If an ST303 is faulty and a by-pass state is set, information from a circuit interface corresponding to, for example, DV50A1 by-passes the ST303. In this case, a comparator 410 is never in a DR ''on'' state for detecting dissidence. |
