AMERITEC AM-48 - Figure 6-5. 4-Wire Testing with Responder

AM-48 Test Set (18-0015) Connection & Configuration
0015-S06
6
-1
3
3. Use the AM-48 keypad to send a DTMF sequence to command
the responder into loopback.
4. Use the AM-48 to send a 1004 Hz tone @ 0 dBm. Measure the
loopback received level and frequency.
5. Use the AM-48 keypad to send a DTMF command sequence to
restore the responder to normal.
On a 2-wire network, dial access responders are very useful in
measuring far-to-near characteristics. An Ameritec AM3-2C
Responder (automatic milliwatt) or AM3-2A Responder can be
dialed up over the network path under test using the AM-48 keypad.
It can then be commanded with touch tone from the AM-48 to make
level measurements or send tones. The AM3-2C can perform far-to-
near level and frequency, idle channel noise, and noise with tone. In
addition to the AM3-2C functions, the AM3-2A can also perform far-
to-near gain slope and near-to-far level. A typical configuration is
illustrated in Figure 6-6.
CPU
DTE
RCV
RCVXMIT
XMIT
<SND>
<RCV>
AM-48
AM3-4A
Responder
Telephone
Network
Loopback Quiet
Send Tones
Amputate
MODEM
MODEM
Figure 6-5. 4-Wire Testing with Responder