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Figure 1.1
MCE325 front and rear panel features.
Rear Panel Features
Intercom Lines
Connectors J8 and J9 are parallel-wired for loop-through connection to additional stations. These
connectors are used either for two-wire channels 1 and 2 input/output, or four-wire channel A
output. (The four-wire channel A input is connected at the auxiliary connector.)
Connector J10 is used for two-wire channel 3 and 4 input/output, or four-wire channel B output,
but no loop-through connector is provided for these channels. (The four-wire channel B input is
connected at the auxiliary connector.)
The MCE325 presents a bridging impedance of 10,000 ohms to the intercom line, and is designed
for use with intercom lines having a 200-ohm line terminating impedance. A 200 ohm termination
plug is supplied (connected to J10) to prevent channels three and four from oscillating when the
MCE325 is in two-channel mode.
External Program Input
Two ¼-inch phone jacks are provided for external program input. The station accepts line-level,
balanced input. The two program inputs are mixed internally, and may be assigned (through
internal programming) to right headphone, left headphone, external speaker, or any combination
of these. In addition, program A may be assigned (through internal programming) to two-wire
channel 3 or four-wire channel A; program B may be assigned to two-wire channel 4, but cannot