Connection & Configuration (18-0015) AM-48 Test Set
0015-S066-12
2. With Switch 8 (Figure 3-5), momentarily press <X TONE> to
send a 2713 Hz tone over the <SND> line. This will trip the
distant Model 829 into loopback.
3. Send the desired test signal with the AM-48 and make the
desired measurement of the looped-back signal.
4. After testing is finished, momentarily press <X TONE> to restore
the Model 829 to its normal, transparent state.
Testing with Responders . The use of multi-function responders
supplies most of the advantages of end-to-end testing with the added
advantage of not requiring an AM-48 at the far end of the system.
This configuration is similar to loopback testing except that the
responder can generate signals in addition to looping back. Unlike a
dedicated loopback device, responders can be used in 2-wire far-to-
near testing.
On 4-wire circuits, a DTMF commandable responder, such as the
Ameritec Model AM3-4, may be placed permanently at the distant
modem where it remains transparent until commanded by DTMF
signals sent from the AM-48 at the central site. In addition to
performing loopback, the responder can send various tones, allowing
for far-to –near tests as well as loopback tests.
EXAMPLE: 4-wire far-to-near and loopback tests for level and
frequency with an Ameritec AM3-4A or AM3-4B Responder:
1. Connect an AM-48 to the near end of a 4-wire facility and an
Ameritec Model AM3-4A or AM3-4B Responder at the far end.
A typical configuration is illustrated in Figure 6-5.
2. Use the AM-48 keypad to send the appropriate DTMF command
sequence to command the responder into milliwatt mode
(responder will generate 1004 Hz, 0 dBm signal). Measure the
received signal and note the level and frequency.
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