| 摘要 |
<p>A supervisory system for a primary group digital transmission line wherein a terminal repeater (LTE0) transmits, over a supervisory line (L), address information designating an intermediate repeater (REP0,1,2,--) and line within the intermediate repeater to be monitored while the line is in a normal, in-service condition. The terminal repeater (LTE0) and intermediate repeaters (REP0,1,2,--) are cascaded connected by way of the supervisory line (L). The terminal repeater (LTE0) and each of the intermediate repeaters (REP0,1,2,--) include amplifiers (T1,T2--,R1,R2,--) that receive and send information along the transmission line, and have a monitor output. The monitor output is processed by an error monitor (EM) within the terminal repeater (LTE0) and in each of the intermediate repeaters (REP0,1,2,--) and the results of the error monitoring provided to the supervisory line in response to polling by the terminal repeater (LTE0).</p> |
