a.
Dashes indicate unassigned code-state combinations.
The far-end responder applies quiet termination for 2.56 seconds upon receipt of the MF command. The three
return-loss tests are: echo return-loss, singing return-loss, and singing return-high loss. All three tests have the
same timing.
As soon as the near-end responder receives the test request, it starts sending a guard tone (1200 Hz) to the control
location. A guard tone is sent for 2.6 to 2.75 seconds. At the same time, the near-end starts transmitting the proper
signal to the far end and also measuring the return-loss. The "return-loss" signal is not a signal sent by the far-end
responder but is the portion of the transmitted signal which is reflected back. The transmit-measure process lasts for
2.56 seconds. Note that the 2.56-second quiet termination provided by the far-end responder will not be in exact
synchronism with the near-end quiet termination due to transmission delays.
After the near-end responder completes the measurement, it sends data (2200 Hz) to the control location. The
duration of the data signal is proportional to the return-loss measurement. Then the near-end sends a guard tone for
25 to 50 milliseconds. As soon as the near-end completes the measurement, it also applies a quiet termination to
the trunk under test. This quiet termination lasts for 2.56 seconds. At the end of the 2.56-second quiet termination
interval, the near-end is ready to receive data from the far-end. It will wait for data for 2.56 seconds, and if none is
received in that period, the near-end resets. If data is received, the near end relays it to the control location, and at
the end of the signal, resets.
After the far-end receives the test request (MF) digit, it applies a quiet termination for 2.56 seconds as previously
described. It then transmits the test signal (according to which return-loss test is being performed) and measures
the return signal for 2.56 seconds. It then transmits the measurement to the near-end in the guard-data-guard
format as described for the near-end responder. The far-end responder then resets.
Note that the time intervals as shown in (Figure 7-3 ) for the far- and near-end responders are not synchronous.
Transmission delays are not shown.
235-105-210
October 1999
Copyright © 1999
Page 10
Summary of Contents for 5ESS-2000
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Page 799: ...Figure 11 36 3 1 Cleaning Points 235 105 210 October 1999 Copyright 1999 Page 7 ...
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Page 1008: ...Figure 11 55 1 CTSNS DIP Switch Settings 235 105 210 October 1999 Copyright 1999 Page 2 ...
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Page 1289: ...Figure 15 17 2 AMATPS Data Link 235 105 210 October 1999 Copyright 1999 Page 2 ...
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Page 1360: ...Figure 15 47 2 Typical SCANS III Link Diagram 235 105 210 October 1999 Copyright 1999 Page 2 ...
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Page 1421: ...Table 1 1 O M Checklist 235 105 210 October 1999 Copyright 1999 Page 3 ...