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WIRE LINE REMOTE BASE
PHONE LINE LEVELS
E. GENERATING SIGNALS ACROSS A BALANCED LINE
1.
Connect the BALUN's balanced side (600 ohm) to the phone line, as shown in figure 4-19. Disconnect any other
equiment (consoles, etc.) connected to the line. Connect the BALUN's unbalanced side to the Mod Out -
DVMI
Counter In jack.
2. Set DISPLAY to DVM AC mode and FUNCTION switch to Generate. Adjust the 1 KHz Level control to the level
desired on the line, as interpolated from the
DBM
scale.
A
typical value for carrier-type lines is
0
dBm.
3. Set DISPLAY to DVM AC mode, FUNCTION switch to Generate, and 1KHz Level control to off position to
generate tone remote control commands.
4. Set MODULATION switch to Cont Tone Remote. High-level guard tone, function tone, and then the continuous
low-level guard tone will go out. Adjust Code Synth Level control for -30 dBm level of low-level guard tone on the
phone line, as interpolated from the DBM scale. This is equivalent to 0 dBm speech test tone level.
5. Switch to Burst position each time that a tone remote control command sequence is desired.
6. Connect the service microphone into the Analyzer's MIC jack. Adjust the Ext. Level control for voice peaks about
6 dB higher than the desired test tone level.
7. With the BALUN switch in the CLOSED position, the BALUN represents a nominal Odb insertion loss from the
unbalanced side to the balanced side. For example, a modulation output of Odbm will be a Odbm input into the 600
ohm line. Characterize your unit before use.
4-34
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