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AM5(e) Classic Instruction Manual
Responder. An example test procedure follows:
1. Connect the TX/2W jack to the SND pair of a 4-Wire circuit, and connect the
RX jack to the RCV pair. Ground the sleeves (or ground terminal) to the CO
ground if Noise-to-Ground tests are required.
2. Connect a handset (capable of generating DTMF signals) to the DIAL
terminals on the front panel and press the key beside the terminals until DIAL
is lighted. (this disconnects all internal AM5(e) Classic circuitry).
3. Send the required DTMF digits to command the responder into the "milliwatt
mode"; it will send 1004 Hz at 0 dBm. (For this and other responder
commands refer to the AM3-4A Responder Instruction Manual — 18-0025).
4. Press the key beside the DIAL terminals so that MEAS is lighted, then select
MEASURE LEVEL FREQ)..
5. Select the MEASure Display and note the Level and Frequency displayed in
the LED display windows.
6. Repeat steps 2 and 3 with the DTMF digits to command the responder into
loopback mode.
7. Select SEND 1004 Hz (level should be 00.0 dBm) then perform step 5 again to
determine the loopback received Level and Frequency. Compare with the
one-way test to determine impairment in the near-to-far end direction.
8. When finished with the test, repeat steps 2 and 3 with the DTMF digits to
command the responder to "reset" (go into "THRU" data mode).
HANDSET
AM5(E) CLASSIC
C
to DIAL
P
U
MODEM
Digital
Send/Rcv Signals
Figure 5-5 – 4-Wire Testing with Responder
5.4.4 2-Wire Testing with Responder: On a 2-Wire network, dial access responders are
very useful in measuring far-to-near impairments. An Ameritec AM3-2C
(Automatic Milliwatt Test Line) or AM3-2A (DTMF Commandable 2-Wire
Responder) can be dialed up over the network by connecting an external handset
to the DIAL terminals of the AM5(e) Classic and selecting the DIAL connection.
Figure 5-6 (shows a 2-Wire network with responders and AM5(e) Classic units at
strategic locations. This configuration allows end-to-end testing (one direction at
a time) between the two AM5(e) Classic units, and allows testing with any
responder in the network from either of the AM5(e) Classic units.
November 19, 1997
(18-0047)
Telephone
Network
R X
T X / 2 W
<RCV>
<SND>
<SND>
<RCV>
Modem
Disconnected
AM3-4A RESPONDER
Page 5-10
LINE FUNCTIONS
• LOOPBACK
• QUIET
• SEND TONES
• AMPUTATE
• THRU (Reset)
T R
DT DR
MODEM
T1 R1
DT1 DR1
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