Unit Description (18-0015) AM-48 Test Set
0015-S033-12
Press a button on the 16-button keypad to generate the
appropriate DTMF or MF tone pair, depending on the
setting of Switch 7. See Table 7-7 for a list of MF and
DTMF tone pairs generated by pressing the keys.
• Set <PULSE> to dial pulse. Switch 7 must be set at
either <MF> or <DTMF>. <PULSE> causes a 200 ohm
DC short across T & R of the send pair to simulate a
telephone
off-hook condition on 2-wire dial access
lines. Press a button on the 16-button keypad while in
this mode to cause the DC short to make and break at
10 PPS, 60% break, creating dial pulses in accordance
with the button pressed.
• Set <ON HK> to
open the DC across T & R of the send
pair to simulate a telephone
on-hook condition on
2-wire dial access lines. The 16-button keypad stays
operational, and if pressed, will send out DTMF or
MF tones (see Table 7-7) as selected by Switch 7.
13
Two-position toggle switch.
• Set <TERM> to terminate the
receive (<RCV>) line
with a resistive impedance as elected by Switch 11.
• Set <BRDG> unterminate the receive line and bridge it
only with the impedance of the measurement circuitry
(>25 kohms) across the receive pair.
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