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ETL600 1KHW001489-EN
ABB Switzerland Ltd
Performance criteria.........................................................................3-66
Transmission time ............................................................................3-66
Nominal transmission time (T0) .......................................................3-67
Maximum actual transmission time (Tac).........................................3-68
Operating principle ...........................................................................3-71
Functional description ......................................................................3-72
Speech bandwidth............................................................................3-73
Command signals ............................................................................3-74
Dual-tone principle ...........................................................................3-74
Trip frequencies ...............................................................................3-75
Command assignment to trip frequencies........................................3-76
Input/Output Command Handling.....................................................3-77
Tx Input Command Delay ................................................................3-78
Tx Input Command Prolongation .....................................................3-78
Tx Trip Duration Monitoring..............................................................3-79
Rx Output Command Duration.........................................................3-79
Rx Output Command Prolongation ..................................................3-79
Rx Trip Duration Monitoring .............................................................3-79
Command Outputs During Link Failure............................................3-81
Tx Command Acknowledge .............................................................3-82
Rx Guard Signaling ..........................................................................3-82
Blocking of AGC...............................................................................3-82
Cyclic Loop Test...............................................................................3-82
Manual Loop Test ............................................................................3-84
Local Test Mode...............................................................................3-84
Command Counters .........................................................................3-84
Alarms Sources................................................................................3-85
Alarm / Warning Contacts ................................................................3-86
Interference in Speech Band............................................................3-87
Compatibility with Inband Modem Signals .......................................3-87
3 APLC in 8 kHz Operating Mode with NSD600 ..............................3-87
Event Recorder...............................................................................3-87
NSD600 Command Events ..............................................................3-88
Alarm, Warning & Manipulation Events............................................3-89
Upload events ..................................................................................3-89
Upload counters ...............................................................................3-90
Reset counter...................................................................................3-90
RTC synchronization from an external clock....................................3-90
Contents November
2005
III
Summary of Contents for ETL600
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