Test Setup For Impulse Noise Without Tone - AMERITECH AM5 Instruction Manual

AM5(e) Classic Instruction Manual
6.7.4 Test Setup for Impulse Noise without Tone: For a typical impulse noise
without tone measurement, there should be no signal on the measured circuit.
For end-to-end tests using AM5(e) Classic units, the far-end unit SEND function
should be set to QUIET while the near-end unit MEASURE function is set to IMP
NOISE. (Refer to Figures 5-3, 5-4, and 5-5 for typical locations of equipment).
Where a responder is installed at the far-end, an external handset should be
connected to the DIAL terminals, the DIAL function selected, and the
responder's number called (refer to sub-section 3.3.29). When the responder
answers, send the appropriate code to put it into the QUIET mode.
For loopback tests, one AM5(e) Classic is used. The SEND selection is QUIET
and the MEASURE selection is IMP NOISE.
6.7.5 Test Setup for Impulse Noise with Tone: For Impulse Noise with Tone
measurement there must be a hold-tone signal on the measured circuit.
For end-to-end tests using AM5(e) Classic units, the far-end unit SEND function
should be set to 1004 Hz (at a level sufficient to ensure a received level of greater
than -40 dBm so that the HOLD indicator is lighted).
The near-end unit MEASURE function is set to IMP N W/T (Refer to Figures 5-3,
5-4, and 5-5 for typical locations of equipment).
Where a responder is installed at the far-end, an external handset should be
connected to the DIAL terminals, the DIAL function selected, and the
responder's number called (refer to sub-section 3.3.29). When the responder
answers, send the appropriate code to put it into the "send 1004 Hz" mode.
For loopback tests, one AM5(e) Classic is used. The SEND selection is 1004 Hz
and the MEASURE selection is IMP NOISE W/T.
6.7.6 Noise Weighting Filters:
measurements (CMSG for the AM5 Classic and PSHO for the AM5e Classic) are
normally used. Other filters may be selected by the left FILTER key to "weight"
the measurement over the band of frequencies that is important for the circuit.
On an AM5e Classic, two of the filter selections also select the Q-Peak detector.
The remaining filters provide RMS detection.
Filters are described in detail in Sections 7 and 8. A summary of filter types will
also be found in sub-section 3.3.17.
November 19, 1997
(18-0047)
The default filter selection for impulse noise
(END OF SECTION 6)
Page 6-14
MEASURE FUNCTIONS