The test center causes self-checks to be made on both near-end (simulated) and far-end responders for loss, noise,
and other tests that are requested. The results of the self-checks are transmitted back to the test center. These
tests consist of the following:
Return-loss measurement
Noise with tone measurement
Gain-slope measurements.
The return-loss measurement is initiated when the near-end responder receives 2 or 3 MF digits as a request for a
return-loss measurement. It relays the layer 2 (and 3, if required) MF digit(s) which denote the test desired to the
far-end responder (Table 7-3 ).
Table 7-3
Interpretation of Responder MF Commands
MF SIGNALS
LAYER
LAYER
LAYER
LAYER
Hz
0 a
1 a
2 a
3 a
700 + 900
600, 0, 105
-
Loss Self-Check: The
responder closes a loop to
measure its input and
output of 1004 Hz (0 dBm)
High frequency return
self-check
measurement
700 + 1100
600, 0, 102
-
Loss Measurement at 1004
Hz (0 dBm)
High frequency return
loss measurement
700 + 1300
600, 0, 100
-
Noise Self-Check: Far-end
responder checks itself
(1004 Hz at -67 dBM)
-
700 + 1500
-
-
-
-
700 + 1700
-
-
Echo return loss
measurement
Echo return loss
self-check
measurement
900 + 1100
-
-
C-noise measurement with
far-end responder
-
900 + 1300
Release
Release
Release
Release
900 + 1500
-
-
Low frequency return loss
measurement
Low frequency return
loss self-check
measurement
900 + 1700
-
-
Loss measurement at 1004
Hz at -16 dBm
Self-check
measurement at 1004
Hz at -16 dBm
1100 + 1300
-
-
Loss measurement at 404
Hz at -16 dBm
Self-check
measurement at 404
Hz at -16 dBm
1100 + 1500
-
-
Noise self-check
measurement on responder
in the ROTL office
-
1100 + 1700
Layer
Layer
Layer
-
1300 + 1500
-
-
Noise measurement with
the responder in the ROTL
office
-
1300 + 1700
-
-
Loss measurement at 2804
Hz at -16 dBm
Self-check
measurement at 2804
Hz at -16 dBm
1500 + 1700
-
-
Noise measurement in the
presence of a 1004-Hz tone
at -16 dBm
Noise with tone
self-check
measurement through
the appropriate filters
Notes:
235-105-210
October 1999
Copyright © 1999
Page 9
Summary of Contents for 5ESS-2000
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